Senior Mobile Developer

🏢 Summary: B2B contract role for a Senior DevOps Engineer working on an AI initiative to build and operate a scalable, secure end-to-end AutoML platform. The position focuses on designing cloud infrastructure, automating CI/CD for model deployment, and ensuring reliable operation of distributed AI services. You will enable production-grade ML workflows with strong emphasis on scalability, security, and automation. 🗂️ Requirements: 5+ years DevOps or Cloud Engineering experience, Hands-on experience with Docker and Kubernetes, Experience with Terraform (Infrastructure as Code), Experience with CI/CD tools, Knowledge of AWS, Azure, or GCP, Experience with secure networking and identity management, Understanding of distributed systems and scalability, Experience with monitoring, logging, and alerting tools, English proficiency, Location in Poland or EU 📃 Skills: Docker, Kubernetes, Terraform, CI/CD, GitHub, GitLab, Jenkins, AWS, Azure, GCP, Networking, IAM, Monitoring, Logging, AutoML, MLOps 🏢 Description: Holisticon Insight is a data-focused technology and consulting company, part of the Nexer Group. Our mission is simple: We make companies Data Driven. We build data platforms and data-intensive systems that solve real business problems. We work end-to-end, from integrating data from multiple sources (including IoT and operational systems), through building scalable data pipelines and semantic layers, to delivering analytics and AI solutions used in production. Our projects often combine data engineering, cloud, and software development. We don’t just process data - we also build systems that generate it, such as IoT and digital platforms, which later become part of the data ecosystem. You’ll work on real use cases – optimizing processes, enabling better decisions, and building data products used by business teams. We focus on clean architecture, modern tech stacks, and ownership of what we build. At Holisticon Insight we value strong engineering skills, autonomy, and collaboration. We keep a flat structure, small teams, and a lot of responsibility on the engineer level. Check us out! 👉 https://holisticon.pl/holisticon-insight/ We offer a B2B Contract: 155 – 185 PLN net/hour + VAT We are looking for a Senior DevOps Engineer to join a cutting-edge AI initiative of our client. The project focuses on resolving data fragmentation and incompleteness by building an end-to-end AutoML pipeline that identifies missing data, trains predictive models, and automatically enriches datasets. As a DevOps Engineer, you will ensure the platform is scalable, secure, and fully automated , enabling reliable deployment and operation of AI services in a distributed computing environment. Your responsibilities: Design and manage cloud infrastructure for a distributed AI/ML platform Transition existing scripts into a scalable, production-ready environment Build and maintain CI/CD pipelines for model deployment Automate promotion of models from staging to production Ensure environment consistency and deployment reliability Containerize AI services to guarantee repeatable and consistent execution Optimize compute costs (e.g., spot instances for training workloads) Implement monitoring, logging, and alerting systems Set up alerts for performance degradation and system anomalies Collaborate closely with Data Engineers, ML Engineers, and Fullstack Developer You might be the perfect match if you possess the following competencies: 5+ years of prior experience in DevOps / Cloud Engineering Strong hands-on experience with: Docker & Kubernetes Terraform (Infrastructure as Code) CI/CD tools (GitHub Actions, GitLab CI, Jenkins, or similar) Deep knowledge of at least one cloud platform: AWS, Azure, or GCP Experience with secure networking, identity management, and cloud architecture Solid understanding of distributed systems and scalability challenges Experience with monitoring, logging, and alerting tools Strong problem-solving skills and ownership mindset Excellent English communication skills Location in Poland or EU 🙌 Nice to have: Experience with MLOps workflows and model lifecycle management Familiarity with AutoML pipelines or AI platforms By joining Holisticon Insight you will get: Life insurance Multisport card Fully remote job Private medical care Flexible working hours B2B or contract of employment Amazing integration events on a regular basis Training budget (e.g. Microsoft Azure Certifications) Opportunity to impact our company culture build-up Work equipment (laptop, 2 monitors, and accessories)

🏢 Summary: Senior Full-Stack Engineer role focused on building scalable enterprise automation software and modern web applications in a distributed engineering environment. The position involves backend and full-stack development using TypeScript, PostgreSQL, REST APIs, and event-streaming technologies, with AI-assisted coding tools integrated into daily work. The offer includes fully remote work, flexible hours, benefits, and opportunities for professional growth. 🗂️ Requirements: 8+ years of Full-Stack Software Engineering experience, Experience building scalable production-grade systems, Strong TypeScript knowledge, Experience with PostgreSQL, Knowledge of REST API design and development, Experience with Kafka or event-streaming platforms, Experience with distributed software systems, Experience with AI-assisted coding tools, Strong English communication skills, Residence in Poland or another EU country 📃 Skills: TypeScript, PostgreSQL, REST, Kafka, Claude, Codex, AI, DevOps, Azure, SaaS 🏢 Description: Holisticon Insight is a data-focused technology and consulting company, part of the Nexer Group. Our mission is simple: We make companies Data Driven. We build data platforms and data-intensive systems that solve real business problems. We work end-to-end, from integrating data from multiple sources (including IoT and operational systems), through building scalable data pipelines and semantic layers, to delivering analytics and AI solutions used in production. Our projects often combine data engineering, cloud, and software development. We don’t just process data - we also build systems that generate it, such as IoT and digital platforms, which later become part of the data ecosystem. You’ll work on real use cases – optimizing processes, enabling better decisions, and building data products used by business teams. We focus on clean architecture, modern tech stacks, and ownership of what we build. At Holisticon Insight we value strong engineering skills, autonomy, and collaboration. We keep a flat structure, small teams, and a lot of responsibility on the engineer level. Check us out! 👉 https://holisticon.pl/holisticon-insight/ We are looking for several Senior Full-Stack Engineers to join a project for our client based in Sweden, a company operating in the enterprise AI and business process automation software industry. In this role, you'll contribute to the development of production-grade software powering enterprise automation solutions. You'll work in a distributed engineering environment, building scalable backend services and modern web applications while leveraging AI-assisted development tools to increase productivity and code quality. You'll collaborate closely with experienced engineers to deliver reliable, maintainable, and high-performing software used by enterprise customers. You might be the perfect match if you possess the following competencies: 8+ years of professional experience as a Full-Stack Software Engineer. Strong engineering background with experience building scalable, production-grade systems. Excellent knowledge of TypeScript across the full stack. Experience with PostgreSQL. Strong understanding of REST API design and development. Hands-on experience with Kafka or other event-streaming platforms. Experience working in distributed software systems. Practical experience using AI-assisted coding tools such as Claude Code, OpenAI Codex, or similar. Strong English communication and collaboration skills. Location in Poland or another EU country. Nice to have: Experience developing commercial SaaS or on-premise software products. Experience working in enterprise software environments. Familiarity with cloud-native architectures and modern DevOps practices. Recruitment process: Initial 30-minute interview with our recruiter. A take-home competence assessment (approximately 5 hours, completed independently and without supervision). Candidates are encouraged to use AI coding assistants such as Claude Code or similar tools during the exercise. Final interview with the client's Head of Engineering. By joining Holisticon Insight you will get: Life insurance. Multisport card. Fully remote job. Private medical care. Flexible working hours. Amazing integration events on a regular basis. Training budget (e.g. Microsoft Azure Certifications). Opportunity to impact our company culture build-up. Work equipment (laptop, 2 monitors, and accessories).

🏢 Summary: Senior Fullstack Engineer role in an AI-driven project focused on building an end-to-end AutoML pipeline to resolve data fragmentation and enrich datasets. The position involves developing an admin dashboard and backend services to monitor, control, and scale AI models and data pipelines. The engineer will ensure system reliability, observability, and seamless integration of ML outputs in a cloud-based environment. 🗂️ Requirements: 5+ years experience as Fullstack Engineer, Strong frontend experience with React, Vue, or Angular, Strong backend experience with Node.js or Python (FastAPI, Flask, or Django), Experience building analytical dashboards or data-heavy UIs, Understanding of microservices, APIs, distributed systems, Experience with cloud platforms (Azure, AWS, or GCP), Familiarity with authentication, logging, monitoring systems, Experience implementing testing and clean code practices, English communication skills, Location in Poland or EU 📃 Skills: React, Vue, Angular, Node.js, Python, FastAPI, Flask, Django, Azure, AWS, GCP, Microservices, APIs, DistributedSystems, Authentication, Logging, Monitoring, AutoML 🏢 Description: Holisticon Insight is a data-focused technology and consulting company, part of the Nexer Group. Our mission is simple: We make companies Data Driven. We help organizations turn data into real business value. We design and build modern data platforms, business intelligence solutions, and AI systems that help companies make better decisions, improve operations, and create new digital services. Our expertise covers the whole data journey - from collecting and integrating data, through analytics and visualization, to advanced AI and machine learning. We achieve this by combining our expertise in building data platforms and IoT platforms, using business intelligence, and applying artificial intelligence and machine learning to enable more advanced analytics. At Holisticon Insight we focus on strong competencies, collaboration, and delivering real outcomes for our customers. We keep a family-like culture with flat structure and empowered teams where every voice counts. Check us out! 👉 https://holisticon.pl/holisticon-insight/ We offer a B2B Contract: 140 – 175 PLN net/hour + VAT We are looking for a Senior Fullstack Engineer to join a cutting-edge AI initiative of our client. The project focuses on resolving data fragmentation and incompleteness by building an end-to-end AutoML pipeline that identifies missing data, trains predictive models, and automatically enriches datasets. As a Fullstack Engineer, you will play a key role in making this AI system accessible, observable, and controllable at scale . Your responsibilities: Build and develop an admin dashboard to monitor pipeline health and model performance Design intuitive data-heavy UI views with drill-down capabilities Develop tools for manual and scheduled execution of training pipelines Implement system controls , including model overrides and blacklisting Build and maintain backend services for: user permissions access logs auditing and error handling Integrate inference outputs and enable automated data write-backs Collaborate closely with Data Engineers, ML Engineers, and DevOps Ensure high standards in code quality, testing, and system reliability You might be the perfect match if you possess the following competencies: 5+ years of prior experience as a Fullstack Engineer Strong experience with: Frontend: React, Vue, or Angular (React preferred) Backend: Node.js or Python (FastAPI, Flask, or Django) Experience building analytical dashboards or data-heavy UIs Understanding of modern software architecture (microservices, APIs, distributed systems) Experience working with cloud platforms (Azure, AWS, or GCP) Familiarity with authentication, logging, and monitoring systems Strong focus on clean code, testing, and best practices Excellent English communication skills Location in Poland or EU 🙌 Nice to have: Experience working with ML pipelines or AI platforms Background in data platforms or AutoML systems Experience with workflow orchestration tools By joining Holisticon Insight you will get: Life insurance Multisport card Fully remote job Private medical care Flexible working hours B2B or contract of employment Amazing integration events on a regular basis Training budget (e.g. Microsoft Azure Certifications) Opportunity to impact our company culture build-up Work equipment (laptop, 2 monitors, and accessories)

🏢 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: 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: 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: 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: 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