Frontend Developer (React/TypeScript)

🏢 Summary: Frontend Developer role in an international product team building a large-scale internal web system as part of a digital transformation initiative. The position focuses on developing high-quality, performant, and maintainable frontend solutions using modern technologies within a cross-functional team. The project emphasizes reliability, scalability, and user-centric design. 🗂️ Requirements: Minimum 5 years of experience as Frontend Developer, Excellent knowledge of React, Excellent knowledge of JavaScript, Excellent knowledge of TypeScript, Hands-on experience with Redux, Hands-on experience with TanStack Query, Experience with REST APIs integration, Experience with Git, Experience writing unit tests, Experience writing integration tests, Experience writing end-to-end tests, Very good English (C1), Experience with microservices architecture, Basic experience with Kotlin, Basic experience with Spring, Based in Poland 📃 Skills: React, JavaScript, TypeScript, Redux, TanStack, REST, Git, Playwright, Selenium, Kotlin, Spring, Microservices, HTML, CSS 🏢 Description: Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Frontend Developer to join an international product team working on a large-scale internal system used daily by users across multiple markets. The product is a key part of an ongoing digital transformation and focuses on delivering reliable, modern, and user-friendly solutions for real business needs. You will work in a cross-functional team alongside UX Designers, Backend Developers, and a Product Owner, contributing to the development of a complex web application where quality, performance, and maintainability truly matter. We offer a competitive renumeration: B2B: 110 – 145 PLN net/hour + VAT Key Responsibilities: Develop and maintain modern frontend applications using React , TypeScript , and JavaScript; Collaborate closely with UX Designers to translate designs into high-quality user interfaces; Integrate frontend solutions with backend services via REST APIs; Manage application state using Redux and TanStack Query; Write unit, integration, and end-to-end tests to ensure application quality and stability; Participate in code reviews and contribute to shared frontend standards; Actively collaborate within the team and across teams to deliver robust, scalable solutions; Use AI tools responsibly to improve development efficiency and code quality. You might be the perfect match if you are / have: At least 5 years of experience working as a Frontend Developer; Excellent knowledge of React , JavaScript , and TypeScript; Very good command of English (C1) , both written and spoken; Hands-on experience with Redux and TanStack Query; Practical experience with Git and working with REST APIs; Experience in writing unit, integration, and end-to-end tests (e.g. React Testing Library, Playwright, Selenium); Awareness of effective and responsible usage of AI models to improve development efficiency; Some experience with microservices and backend technologies such as Kotlin and Spring; A strong focus on writing clean, maintainable, and readable code; A proactive, communicative team player who values collaboration; Based in Poland , with availability for occasional in-person team meetings. Moreover, we appreciate skills in these areas: Experience working on large-scale or enterprise-level applications; Familiarity with design systems and close collaboration with UX teams; Understanding of performance optimization and frontend architecture; Experience working in agile, cross-functional teams; Openness to learning beyond frontend and understanding the broader system context. By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: 1) You will be invited to an HR Screening with our IT Recruiter. 2) You will have a technical interview. 3) You will meet with a client. Submit your application online in one easy step! Apply now! You will earn: B2B: 110 – 145 PLN net/hour + VAT

🏢 Summary: B2B Fullstack Engineer role focused on building and scaling secure applications to support genomic data science and AI-driven insights for disease research. The position involves developing React/Node.js and Python (FastAPI) solutions deployed on AWS, with strong emphasis on APIs, containerization, and production-grade systems. The project includes agentic AI systems and scalable cloud infrastructure. 🗂️ Requirements: Expertise in TypeScript and React, Expertise in Node.js, Expertise in Python and FastAPI, Experience with AWS services (CDK, ECS, ALB, EC2), Experience with Docker and containerization, Experience designing and securing APIs, Experience with SQL and NoSQL databases, Experience with logging, monitoring, and debugging production systems, Ability to work in Unix/Linux environments, Bash scripting skills, Experience with LangGraph or agentic AI systems, Fluent English (C1), Location in Poland 📃 Skills: TypeScript, JavaScript, React, Node.js, Python, FastAPI, AWS, CDK, ECS, ALB, EC2, Docker, SQL, PostgreSQL, NoSQL, Unix, Linux, Bash, LangGraph, CI/CD, CloudFormation, Lambda, Nginx, Flask, Playwright, Jest 🏢 Description: Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers.If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Fullstack Engineer to join a team that is expanding its genomic data science capabilities to explore data from multiple sources. The goal is to gain insights into the genomic drivers of common diseases and support the identification of novel therapeutic targets. We offer a B2B contract: 140 – 160 PLN net/hour + VAT You might be the perfect match if you are/have: ✅ Technical skills: Expertise in TypeScript (JavaScript) - React & Node.js; Expertise in Python (& FastAPI); Experience building and deploying secure and scalable apps in AWS (e.g., AWS CDK, ECS, ALB, EC2); Strong understanding of containerisation (+ deployment) - Docker ; Experience designing and securing APIs ; Experience with LangGraph and/or building agentic AI systems ; Strong knowledge of databases – SQL (PostgreSQL or similar) and NoSQL ; Experience logging, monitoring, and debugging production systems; Ability to work in Unix/Linux environments and with Bash scripting. ✅ Soft skills and others: Robust software development best practices and documentation; Proactive and self-driven, able to identify opportunities and suggest tasks rather than waiting for assignments; Strong team player , comfortable collaborating and contributing in group settings; Strong communication skills; Positive mindset and constructive approach to challenges; Initiative-taker who is not afraid to lead or push ideas forward and deliver in a fast-paced environment; Eager to learn, grow, and continuously develop new skills; Fluent English (C1) for effective collaboration in an international environment; Location in Poland (at least 5 years), enabling smooth cooperation and occasional in-person team meetings; Availability up to one month . Moreover, we appreciate skills in these areas: 5+ years of experience in a similar senior role; Strong product mindset; Familiarity with CI/CD pipelines; Familiarity with Domino Data Lab; AWS CloudFormation, CloudFormation, Lambda; Nginx; Other Python frameworks like Flask; Experience with testing frameworks/tools (e.g. Playwright, Jest); Interest in Life Sciences and Drug Discovery. By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: 1) You will be invited to an HR Screening with our IT Recruiter. 2) You will have a technical interview. 3) You will meet with a client. Submit your application online in one easy step! Apply now!

🏢 Summary: Fullstack Engineer role focused on building secure, scalable applications to support genomic data science and AI-driven insights for disease research and therapeutic target identification. The position involves developing and deploying cloud-based systems using modern TypeScript and Python stacks in AWS environments. B2B contract with fully remote work and collaboration in an international team. 🗂️ Requirements: Expertise in TypeScript and React, Expertise in Node.js, Expertise in Python and FastAPI, Experience building and deploying applications in AWS, Experience with containerization using Docker, Experience designing and securing APIs, Experience with SQL and NoSQL databases, Experience with logging, monitoring, and debugging production systems, Ability to work in Unix/Linux environments, Bash scripting skills, Fluent English (C1), Location in Poland 📃 Skills: TypeScript, JavaScript, React, Node.js, Python, FastAPI, AWS, CDK, ECS, ALB, EC2, Docker, SQL, PostgreSQL, NoSQL, LangGraph, Unix, Linux, Bash, CloudFormation, Lambda, Nginx, Flask, Playwright, Jest 🏢 Description: Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Fullstack Engineer to join a team that is expanding its genomic data science capabilities to explore data from multiple sources. The goal is to gain insights into the genomic drivers of common diseases and support the identification of novel therapeutic targets. We offer a B2B contract: 140 – 160 PLN net/hour + VAT You might be the perfect match if you are/have: ✅ Technical skills: Expertise in TypeScript (JavaScript) - React & Node.js; Expertise in Python (& FastAPI); Experience building and deploying secure and scalable apps in AWS (e.g., AWS CDK, ECS, ALB, EC2); Strong understanding of containerisation (+ deployment) - Docker ; Experience designing and securing APIs ; Experience with LangGraph and/or building agentic AI systems ; Strong knowledge of databases – SQL (PostgreSQL or similar) and NoSQL ; Experience logging, monitoring, and debugging production systems; Ability to work in Unix/Linux environments and with Bash scripting. ✅ Soft skills and others: Robust software development best practices and documentation; Proactive and self-driven, able to identify opportunities and suggest tasks rather than waiting for assignments; Strong team player , comfortable collaborating and contributing in group settings; Strong communication skills; Positive mindset and constructive approach to challenges; Initiative-taker who is not afraid to lead or push ideas forward and deliver in a fast-paced environment; Eager to learn, grow, and continuously develop new skills; Fluent English (C1) for effective collaboration in an international environment; Location in Poland (at least 5 years), enabling smooth cooperation and occasional in-person team meetings; Availability up to one month . Moreover, we appreciate skills in these areas: 5+ years of experience in a similar senior role; Strong product mindset; Familiarity with CI/CD pipelines; Familiarity with Domino Data Lab; AWS CloudFormation, CloudFormation, Lambda; Nginx; Other Python frameworks like Flask; Experience with testing frameworks/tools (e.g. Playwright, Jest); Interest in Life Sciences and Drug Discovery. By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: 1) You will be invited to an HR Screening with our IT Recruiter. 2) You will have a technical interview. 3) You will meet with a client. Submit your application online in one easy step! Apply now! You will earn: B2B: 140 – 160 PLN net/hour + VAT

🏢 Summary: Fullstack Engineer role focused on building secure, scalable applications to support genomic data science and AI-driven insights in healthcare. The position involves developing and deploying cloud-based solutions using modern TypeScript and Python stacks in AWS. B2B contract with competitive hourly rate and fully remote work option. 🗂️ Requirements: Expertise in TypeScript with React and Node.js, Expertise in Python with FastAPI, Experience building and deploying applications in AWS, Experience with AWS CDK, ECS, ALB, EC2, Strong knowledge of Docker and containerisation, Experience designing and securing APIs, Experience with LangGraph or agentic AI systems, Strong knowledge of SQL and NoSQL databases, Experience with PostgreSQL or similar databases, Experience logging, monitoring and debugging production systems, Ability to work in Unix/Linux environments, Bash scripting skills, Fluent English (C1), Location in Poland (min. 5 years), Availability up to one month 📃 Skills: TypeScript, React, Node.js, Python, FastAPI, AWS, CDK, ECS, ALB, EC2, Docker, SQL, PostgreSQL, NoSQL, LangGraph, Bash, Linux, Unix, REST, Monitoring, Logging, Debugging 🏢 Description: Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Fullstack Engineer to join a team that is expanding its genomic data science capabilities to explore data from multiple sources. The goal is to gain insights into the genomic drivers of common diseases and support the identification of novel therapeutic targets. We offer a B2B contract: 140 – 160 PLN net/hour + VAT You might be the perfect match if you are/have: ✅ Technical skills: Expertise in TypeScript (JavaScript) - React & Node.js; Expertise in Python (& FastAPI); Experience building and deploying secure and scalable apps in AWS (e.g., AWS CDK, ECS, ALB, EC2); Strong understanding of containerisation (+ deployment) - Docker ; Experience designing and securing APIs ; Experience with LangGraph and/or building agentic AI systems ; Strong knowledge of databases – SQL (PostgreSQL or similar) and NoSQL ; Experience logging, monitoring, and debugging production systems; Ability to work in Unix/Linux environments and with Bash scripting. ✅ Soft skills and others: Robust software development best practices and documentation; Proactive and self-driven, able to identify opportunities and suggest tasks rather than waiting for assignments; Strong team player , comfortable collaborating and contributing in group settings; Strong communication skills; Positive mindset and constructive approach to challenges; Initiative-taker who is not afraid to lead or push ideas forward and deliver in a fast-paced environment; Eager to learn, grow, and continuously develop new skills; Fluent English (C1) for effective collaboration in an international environment; Location in Poland (at least 5 years), enabling smooth cooperation and occasional in-person team meetings; Availability up to one month . Moreover, we appreciate skills in these areas: 5+ years of experience in a similar senior role; Strong product mindset; Familiarity with CI/CD pipelines; Familiarity with Domino Data Lab; AWS CloudFormation, CloudFormation, Lambda; Nginx; Other Python frameworks like Flask; Experience with testing frameworks/tools (e.g. Playwright, Jest); Interest in Life Sciences and Drug Discovery. By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: 1) You will be invited to an HR Screening with our IT Recruiter. 2) You will have a technical interview. 3) You will meet with a client. Submit your application online in one easy step! Apply now! You will earn: B2B: 140 – 160 PLN net/hour + VAT

🏢 Summary: Full-stack Developer role in an international product team building a scalable, data-driven platform supporting complex global decision-making processes. The position focuses on active product development with real ownership, combining Python-based backend and React frontend in a collaborative Agile environment. Requires daily overlap with US time zones. 🗂️ Requirements: 5+ years of experience as Fullstack Developer, Strong experience with Python, Experience with Django or Flask, Solid experience with React, Understanding of REST APIs, Knowledge of web application architecture, Experience with relational databases, Experience with PostgreSQL, Familiarity with Docker, Experience with CI/CD, Very good English, Availability for US time overlap (12:00–18:00 CET) 📃 Skills: Python, Django, Flask, React, REST, PostgreSQL, Docker, CI/CD, AWS, ECS, ECR, S3, TypeScript 🏢 Description: Holisticon Connect is a division within NEXER GROUP – a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Full-stack Developer , who will join an international product-driven team working on a cutting-edge platform combining advanced data, scalable systems, and modern web technologies. The product supports complex decision-making processes and operates at a global scale. The team works in a highly collaborative environment with engineers and stakeholders based in the US and Europe. This is not a maintenance project – it’s active product development with real ownership and engineering influence. Because of the distributed setup, daily overlap with US time zones (12:00–18:00 CET) is required. We offer a competitive remuneration: B2B: 140 – 160 PLN net/hour + VAT Your responsibilities: Designing and developing fullstack web applications (backend + frontend); Building new features and improving existing functionalities; Writing clean, scalable, and testable code; Collaborating closely with Product, Design, and other Engineers; Participating in code reviews and technical discussions; Contributing to architecture decisions and continuous improvements; Working in an Agile/Scrum environment. You might be the perfect match if you are/have: 5+ years of experience as a Fullstack Developer; Strong experience with Python (Django or Flask preferred); Solid frontend experience with React; Good understanding of REST APIs and web application architecture; Experience with relational databases (PostgreSQL preferred); Familiarity with Docker and CI/CD practices; Very good English (daily communication with international team); Availability to work with required US overlap (12:00–18:00 CET). Moreover, we appreciate skills in these areas: Experience with AWS (ECS, ECR, S3 or similar services); Knowledge of TypeScript; Experience working in product-oriented teams; Exposure to data-heavy or performance-sensitive systems. By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life, so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: 1) You will be invited to an HR Screening with our IT Recruiter. 2) You will have a technical interview. 3) You will meet with a client. Submit your application online in one easy step! Apply now!

🏢 Summary: Full-stack Developer role in an international, product-driven team building a global, data-intensive platform using modern web technologies. The position focuses on active product development, new features, and architectural decisions within a collaborative Agile environment. Requires daily overlap with US time zones and offers competitive B2B compensation. 🗂️ Requirements: 5+ years experience as Fullstack Developer, Strong Python experience, Experience with Django or Flask, Strong React experience, Understanding of REST APIs, Knowledge of web application architecture, Experience with relational databases, Experience with PostgreSQL, Familiarity with Docker, Experience with CI/CD, Very good English, Availability for US time zone overlap (12:00–18:00 CET) 📃 Skills: Python, Django, Flask, React, REST, PostgreSQL, SQL, Docker, CI/CD, AWS, ECS, ECR, S3, TypeScript, Agile, Scrum 🏢 Description: Holisticon Connect is a division within NEXER GROUP – a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Full-stack Developer , who will join an international product-driven team working on a cutting-edge platform combining advanced data, scalable systems, and modern web technologies. The product supports complex decision-making processes and operates at a global scale. The team works in a highly collaborative environment with engineers and stakeholders based in the US and Europe. This is not a maintenance project – it’s active product development with real ownership and engineering influence. Because of the distributed setup, daily overlap with US time zones (12:00–18:00 CET) is required. We offer a competitive renumeration: B2B: 140 – 160 PLN net/hour + VAT Your responsibilities: Designing and developing fullstack web applications (backend + frontend); Building new features and improving existing functionalities; Writing clean, scalable, and testable code; Collaborating closely with Product, Design, and other Engineers; Participating in code reviews and technical discussions; Contributing to architecture decisions and continuous improvements; Working in an Agile/Scrum environment. You might be the perfect match if you are/have: 5+ years of experience as a Fullstack Developer; Strong experience with Python (Django or Flask preferred); Solid frontend experience with React; Good understanding of REST APIs and web application architecture; Experience with relational databases (PostgreSQL preferred); Familiarity with Docker and CI/CD practices; Very good English (daily communication with international team); Availability to work with required US overlap (12:00–18:00 CET). Moreover, we appreciate skills in these areas: Experience with AWS (ECS, ECR, S3 or similar services); Knowledge of TypeScript; Experience working in product-oriented teams; Exposure to data-heavy or performance-sensitive systems. By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: 1) You will be invited to an HR Screening with our IT Recruiter. 2) You will have a technical interview. 3) You will meet with a client. Submit your application online in one easy step! Apply now! You will earn: B2B: 140 – 160 PLN net/hour + VAT

🏢 Summary: Senior Frontend Engineer (UI/UX Focus) responsible for designing and building high-performance, user-centered interfaces for AI-powered image analysis solutions. The role involves shaping frontend architecture, driving UX decisions, and developing scalable design systems in close collaboration with cross-functional teams. Position offers flexible employment options (B2B or UoP) and fully remote work. 🗂️ Requirements: Minimum 5 years of professional frontend development experience, Strong expertise in React, Strong expertise in TypeScript, Experience with hooks and state management, Hands-on experience with UI/UX design tools (Figma or Sketch), Advanced knowledge of CSS including responsive design and cross-browser compatibility, Experience with automated testing (E2E and unit/integration), Knowledge of accessibility standards (WCAG) and semantic HTML, Experience building or maintaining design systems and component libraries, Experience integrating APIs (REST or GraphQL), Knowledge of frontend performance optimization techniques 📃 Skills: React, TypeScript, JavaScript, CSS, HTML, Figma, Sketch, Playwright, Jest, TestingLibrary, WCAG, ARIA, REST, GraphQL, D3, OpenLayers, Storybook 🏢 Description: Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Senior Frontend Engineer (UI/UX Focus) who will take ownership of designing and building intuitive, high-performance user interfaces for advanced, AI-powered image analysis solutions. In this role, you will work closely with cross-functional teams — including software engineers, product owners, and domain experts — to translate complex scientific and product requirements into elegant, user-centered experiences. You will play a key role in shaping the frontend architecture, driving UX decisions, and evolving a scalable design system, ensuring both usability and technical excellence. We offer a choice of employment form: B2B or Employment Contract UoP: 15 000 – 18 000 PLN gross/month B2B: 120 – 150 PLN net/hour + VAT You might be the perfect match if you are/have: Have at least 5 years of professional experience in frontend development; Have strong expertise in React and TypeScript , including hooks, state management, and modern frontend patterns; Have hands-on experience with UI/UX design practices and tools (e.g. Figma, Sketch), including wireframing, prototyping, and user flows; Have excellent knowledge of CSS , including CSS-in-JS or utility frameworks, responsive design, and cross-browser compatibility; Have experience with automated testing (Playwright for E2E, Testing Library/Jest for unit and integration tests); Understand accessibility standards (WCAG) , semantic HTML, and ARIA best practices; Have experience building or evolving a design system and component libraries; Have worked with APIs (REST, GraphQL, or similar), including authentication, caching, and error handling; Understand frontend performance optimization (e.g. code splitting, lazy loading, profiling). Moreover, we appreciate skills in these areas: Experience with data visualization (e.g. D3, OpenLayers or similar); Familiarity with Storybook-driven development; Basic backend awareness to support effective end-to-end collaboration; Experience with analytics and telemetry (tracking user behavior, product insights). By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: You will be invited for an HR screening to get to know your experience, expectations, and motivation; You will be invited for a technical interview (~60 minutes) to discuss your approach, problem-solving, and frontend expertise in more depth; Submit your application online in one easy step! Apply now! You will earn: UoP: 15 000 – 18 000 PLN gross/month B2B: 120 – 150 PLN net/hour + VAT

🏢 Summary: The offer is for a Senior Frontend Engineer with UX experience to design and build high-performance, user-centered interfaces for AI-powered image analysis solutions. The role involves shaping frontend architecture, driving UX decisions, and developing a scalable design system in close collaboration with cross-functional teams. It provides flexible employment options, competitive compensation, and the opportunity to work on international, cutting-edge projects. 🗂️ Requirements: Minimum 5 years of professional frontend development experience, Strong expertise in React, Strong expertise in TypeScript, Experience with hooks, state management, and modern frontend patterns, Hands-on experience with UI/UX design tools (e.g. Figma, Sketch), Strong knowledge of CSS including CSS-in-JS or utility frameworks, Experience with automated testing (Playwright, Testing Library, Jest), Knowledge of accessibility standards (WCAG), semantic HTML, ARIA, Experience building or evolving design systems and component libraries, Experience working with REST or GraphQL APIs, Knowledge of frontend performance optimization techniques 📃 Skills: React, TypeScript, JavaScript, HTML, CSS, CSS-in-JS, Playwright, Jest, TestingLibrary, WCAG, ARIA, REST, GraphQL, Figma, Sketch, D3, OpenLayers, Storybook 🏢 Description: Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Senior Frontend Engineer with UX experience who will take ownership of designing and building intuitive, high-performance user interfaces for advanced, AI-powered image analysis solutions. In this role, you will work closely with cross-functional teams — including software engineers, product owners, and domain experts — to translate complex scientific and product requirements into elegant, user-centered experiences. You will play a key role in shaping the frontend architecture, driving UX decisions , and evolving a scalable design system, ensuring both usability and technical excellence. We offer a choice of employment form: B2B or Employment Contract UoP: 15 000 – 18 000 PLN gross/month B2B: 120 – 150 PLN net/hour + VAT You might be the perfect match if you are/have: Have at least 5 years of professional experience in frontend development; Have strong expertise in React and TypeScript , including hooks, state management, and modern frontend patterns; Have hands-on experience with UI/UX design practices and tools (e.g. Figma, Sketch), including wireframing, prototyping, and user flows; Have excellent knowledge of CSS , including CSS-in-JS or utility frameworks, responsive design, and cross-browser compatibility; Have experience with automated testing (Playwright for E2E, Testing Library/Jest for unit and integration tests); Understand accessibility standards (WCAG) , semantic HTML, and ARIA best practices; Have experience building or evolving a design system and component libraries; Have worked with APIs (REST, GraphQL, or similar), including authentication, caching, and error handling; Understand frontend performance optimization (e.g. code splitting, lazy loading, profiling). Moreover, we appreciate skills in these areas: Experience with data visualization (e.g. D3, OpenLayers or similar); Familiarity with Storybook-driven development ; Basic backend awareness to support effective end-to-end collaboration; Experience with analytics and telemetry (tracking user behavior, product insights). By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: You will be invited for an HR screening to get to know your experience, expectations, and motivation; You will be invited for a technical interview (~60 minutes) to discuss your approach, problem-solving, and frontend expertise in more depth; Submit your application online in one easy step! Apply now! You will earn: UoP: 15 000 – 18 000 PLN gross/month B2B: 120 – 150 PLN net/hour + VAT

🏢 Summary: Backend/Full-Stack Developer role focused on building and evolving a large-scale, cloud-native, event-driven system used across multiple markets. The position involves developing Kotlin-based microservices, integrating event streaming solutions, and contributing to React frontend components closely connected with backend services. The role emphasizes scalable architecture, clean code, and reliable cloud deployment in an international product team. 🗂️ Requirements: Minimum 5 years of experience as Backend Developer, Strong knowledge of Kotlin, Strong knowledge of Spring Boot, Solid knowledge of SQL, Experience with PostgreSQL, Experience in microservices architecture, Experience with Apache Kafka, Experience with asynchronous communication, Experience with AWS, Experience with Kubernetes, Experience building REST APIs, Experience with Git, Knowledge of JavaScript or TypeScript, Experience with React, Understanding of frontend-backend integration, Knowledge of distributed systems fundamentals, Experience writing unit tests, Experience writing integration tests, Experience writing end-to-end tests, Fluent English (C1), Based in Poland 📃 Skills: Kotlin, Spring, SpringBoot, SQL, PostgreSQL, Kafka, AWS, Kubernetes, REST, Git, JavaScript, TypeScript, React, Microservices, Docker 🏢 Description: Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 We are looking for a Backend/Full-Stack Developer to join an international product team building a large-scale internal system used daily across multiple markets. The product plays a key role in an ongoing digital transformation and is built as a set of scalable, event-driven microservices running in a cloud environment. You will work in a cross-functional team with Frontend Developers, UX Designers, and a Product Owner, contributing to backend services as well as selected frontend areas that require close backend integration, high reliability, performance, and clean architecture. We offer competitive remuneration: B2B: 110 – 145 PLN net/hour + VAT Key Responsibilities Design, develop, and maintain backend services using Kotlin and Spring Boot; Build and evolve microservices with asynchronous communication patterns; Implement and integrate event-driven solutions using Apache Kafka; Work with relational databases, primarily PostgreSQL, ensuring data consistency and performance; Develop and consume REST APIs used by frontend applications and other services; Contribute to frontend application development using React, especially in areas closely connected to backend integrations and business logic; Collaborate with Frontend Developers and UX Designers to deliver consistent, end-to-end solutions across backend services and user-facing applications; Write unit, integration, and end-to-end tests within the Kotlin ecosystem; Support frontend reliability and maintainability by designing clean service contracts and integration-friendly APIs; Deploy and operate services in a cloud-native environment (AWS, Kubernetes); Participate in code reviews and contribute to engineering standards and best practices; Use AI tools responsibly to improve development efficiency and code quality. You might be the perfect match if you are/have: At least 5 years of experience working as a Backend Developer ; Excellent knowledge of Kotlin and Spring Boot , with a solid understanding of SQL (PostgreSQL preferred); Very good command of English (C1), both written and spoken; Hands-on experience designing services in a microservices architecture; Experience working with Apache Kafka and asynchronous communication; Ability to work in a cloud environment, including AWS and Kubernetes; Practical experience with Git and building REST APIs; Practical knowledge of JavaScript or TypeScript and modern frontend development practices; Practical understanding of frontend-backend integration and how React applications communicate with backend services through APIs; Understanding of system design fundamentals in distributed systems; Experience writing unit, integration, and end-to-end tests in the Kotlin ecosystem; A strong focus on clean, maintainable, and readable code; A proactive, communicative team player with an open and collaborative mindset; Based in Poland, with availability for occasional in-person team meetings. Moreover, we appreciate skills in these areas: Experience with Kubernetes and container orchestration; Hands-on experience with cloud platforms, especially AWS; Familiarity with event-driven and message-based architectures; Experience working on large-scale or enterprise-level systems; Experience with TypeScript and the modern React ecosystem; Familiarity with frontend architecture, state management, and component-based design; Understanding of usability and performance considerations in web applications; Willingness to take ownership and influence technical decisions. By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: 1) You will be invited to an HR Screening with our IT Recruiter. 2) You will have a technical interview. 3) You will meet with a client. Submit your application online in one easy step! Apply now! You will earn: B2B: 110 – 145 PLN net/hour + VAT

🏢 Summary: The offer is for a Software Developer to build and scale computational pathology workflows, contributing to the development of an AI-driven diagnostic product. The role focuses on designing efficient data-handling pipelines, improving tooling, and ensuring high-quality, compliant software in a regulated environment. You will work cross-functionally to deliver robust solutions supporting clinical diagnostics. 🗂️ Requirements: Strong programming experience in Python, Strong programming experience in Go, Experience with software engineering best practices, Experience with unit testing and code quality practices, Experience in data modeling and data processing, Experience working with data warehouses, Experience with containerized environments, Experience with CI platforms, Ability to work in regulated environments, Experience with image processing or computer vision 📃 Skills: Python, Go, Pydantic, Pandas, DBT, Snowflake, OpenCV, Docker, GitHub, TypeScript, Node.js, JavaScript 🏢 Description: Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊 For a fast‑growing and ambitious Computational Pathology team , we are looking for a Software Developer with a strong background in data‑handling workflows . The team’s mission is to build and scale a robust pipeline of computational pathology–based scoring methods, with the goal of improving clinical outcomes and transforming traditional diagnostic practices. Ultimately, the team is working toward the development of a first‑in‑class computational pathology–based diagnostic (Dx) product and establishing a leading position in AI‑driven diagnostic solutions with proven clinical value. I n this role you will support development of computational pathology workflows by, working cross-functionally to collect and understand user requirements, establish workflow designs and efficient software solutions. Developing novel, or improve existing tools used in the computational pathology workflows. Add new features, fix bugs, raise test coverage and improve documentation and work towards ensuring compliance of processes and developed tooling. We offer a choice of employment form: B2B or Employment Contract UoP: 14 000 – 16 000 PLN gross/month B2B: 120 – 140 PLN net/hour + VAT You might be the perfect match if you are/have: Strong expertise in Python and Go , demonstrated through hands‑on programming experience and real‑world projects. Software engineering best practices, with the aim of writing modern, bug-free code, proper documentation of code, unit-testing, code quality, etc. Interest in understanding of business processes and providing fit-for-purpose solutions. Moreover, we appreciate skills in these areas: Data modeling and processing with libraries such as Pydantic and Pandas , and data transformations using DBT and warehouses like Snowflake . Image processing/Computer Vision problems, e.g. experience with OpenCV. Containerized environments and CI platforms e.g. Github actions. Experience of working in a regulated environment, developing code under pre-set regulatory rules. Front-end development using TypeScript/Node/JavaScript. By joining us, you gain the following: Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT; Possibility to develop in cloud technologies; Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen; Respect for your private life so you don't have to work overtime or on weekends; Team Events budget to socialize outside of work; Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona). Perks and benefits: Fully remote work or in our office in Wrocław; Benefits such as Luxmed , Multisport , and life insurance in Nationale Nederlanden ; Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior); Personal Training Budget with additional paid hours; Passion Day - an extra day off for your hobby to spend as you please; Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you; We provide high-quality work equipment + 2 additional monitors and accessories. If you apply for this position and match our expectations, then: 1) You will be invited to an HR Screening with our IT Recruiter. 2) You will have a technical interview. 3) Decision. Submit your application online in one easy step! Apply now!