Senior Backend Developer

🏢 Summary: Senior Backend Developer role focused on designing, building, and maintaining scalable, secure backend services for a cloud-native digital platform supporting IoT-enabled solutions. The position involves end-to-end ownership of features, including development, testing, deployment, monitoring, and incident handling in a data-intensive, high-traffic environment. You will collaborate cross-functionally to deliver reliable systems using modern AWS-based infrastructure and DevOps practices. 🗂️ Requirements: Minimum 7 years of backend development experience, Strong knowledge of algorithms, data structures, system design, Proficiency in JavaScript and TypeScript, Experience with Node.js and npm, Hands-on experience with AWS services (Lambda, S3, DynamoDB, RDS, VPC), Experience with Kubernetes and Terraform, Experience building REST APIs, Knowledge of API security, authentication, authorization, OWASP, Experience with event-driven architecture, Experience with unit, E2E, and load testing, Experience with CI/CD pipelines and Docker, Experience monitoring and supporting production systems, Experience with data-intensive and high-traffic applications, Fluent English, Ability to work hybrid from Tumba office 3 days per week 📃 Skills: JavaScript, TypeScript, Node.js, npm, AWS, Lambda, S3, DynamoDB, RDS, VPC, CDK, Kubernetes, Terraform, REST, OWASP, Jest, Cypress, JMeter, SonarQube, Git, CI/CD, Docker, Grafana, Loki, Sentry, OpsGenie, Algorithms, DataStructures, SystemDesign 🏢 Description: 🚀 Senior Backend Developer Location: Krakow, Poland or Tumba, Sweden (Hybrid) Contract: B2B, Full-Time Join the Future of Digital Tech with Kolomolo At Kolomolo , we don’t just follow trends - we set them. As a global supplier of IT services and digital modernization solutions, we help businesses embrace cutting-edge technology to optimize their operations. Now, we are growing and looking for fresh talent to grow with us. Are you proactive, tech-savvy, and eager to build your career in IT? This role could be your perfect fit. About the Role Are you a backend developer who enjoys solving real-world problems with clean, scalable code? Do you want your work to have a meaningful impact beyond the screen? At Kolomolo,we are looking for a technically driven and collaborative Senior Backend Developer to join our cross-functional team developing our digital platform supporting modern dairy farmers around the world. In this role, you will work closely with Product Owners, Project Managers, Scrum Masters, UX Designers, QA Engineers, and other developers to build and maintain the backend services powering our website. You will be involved in the entire feature lifecycle - from design and development to testing, deployment, monitoring, and incident handling. You will build and evolve backend functionality that supports Service Technicians and Installers in their daily work. This includes solutions for installation, configuration, equipment health monitoring, troubleshooting, sw/fw update orchestration, device lifecycle orchestration, and IoT-enabled services. You will help shape robust, secure, scalable, and observable backend services using modern, cloud-native technologies. This role is ideal for someone who’s excited to deliver reliable systems at scale, enjoys working with data-intensive applications, and is passionate about making a difference in the lives of real users. What You’ll Be Doing Design, build, and maintain backend services for our platform; Collaborate with a cross-functional team to deliver high-quality features end to end; Write secure and testable APIs following OWASP and clean code principles; Manage infrastructure and deployments using modern IaC and DevOps tools; Work on data-heavy services that are central to our platform’s performance and reliability; Monitor services in production, respond to incidents, and continuously improve system resilience; Contribute to our culture of learning and knowledge sharing. What We Are Looking For We are looking for someone with at least 7 years of backend development experience. You should also have a solid foundation in computer science, with strong knowledge of algorithms, data structures, and system design. Languages & Runtime: JavaScript, TypeScript, Node.js, npm; Cloud & Infrastructure: AWS (Lambda, S3, DynamoDB, RDS, VPC), CDK, Kubernetes, Terraform; Architecture & Patterns: REST API development, API security (authentication, authorization, OWASP best practices), event-driven architecture; Testing & Quality: Jest (unit testing), Cypress (E2E), JMeter (load testing),SonarQube; DevOps & Observability: Git, CI/CD pipelines, Docker, Grafana, Loki, Sentry, OpsGenie; Best Practices: Clean code, secure coding, code reviews, production monitoring, incident response; Special Focus: Experience working with data-intensive and high-traffic applications; Computer Science Fundamentals: Algorithms, data structures, system design. You are not just a developer – you are a team player and a problem solver. We believe you will thrive here if you: • Take responsibility for your work and follow through; • Have strong technical curiosity and a drive to continuously learn; • Are proactive and enjoy taking initiative; • Value collaboration and helping others succeed; • Have experience handling incidents and working with customer service to improve production systems; • Have worked with production-grade systems and understand the importance of quality, reliability, and supportability; • Are fluent in English (required) and preferably also in Swedish; • Are able and willing to work from our Tumba office at least 3 days per week. What is in It for You Competitive salary and benefits; Career development opportunities in a growing tech company; Continuous learning culture: mentorship, internal training, and certifications; Flexible, agile work environment (hybrid in Kraków); Office perks: great coffee, tea, fresh fruit, snacks, and a fun atmosphere; Flat management structure, where your voice matters; Regular team events and a social, supportive work culture; B2B contract or Contract of Mandate (Umowa Zlecenie); 🌟 Why Join Kolomolo? At Kolomolo , we prioritize innovation, agility, and autonomy. Our teams have the freedom to own their work, share ideas, and make meaningful contributions. Inspired by Scandinavian values , we believe in work-life harmony and creating an inclusive culture where everyone thrives. You will be part of a passionate, skilled, and friendly team that works hard and celebrates together. Here, you can build your career on your own terms, with opportunities to grow, learn, and make a real impact. Our Flat Structure & The Culture of Inclusion At Kolomolo, we break the corporate mold. We offer: Agile Teams & Autonomy : No micromanagement. You’ll own your projects and enjoy the freedom to innovate. Work-Life Harmony : Inspired by Scandinavian values, we prioritize balance and flexibility, where remote work and asynchronous collaboration are in our DNA. Learning & Growth : Continuous learning is at our core. We reward hard work, value smart ideas, and foster an environment of mutual respect and trust. Inclusive Culture : We believe in DEI: diversity, equity and inclusion. We are committed to creating an environment where every individual, regardless of background, identity, or experience feels valued, respected, and empowered to thrive. Join Kolomolo and elevate your career with cutting-edge technology, a supportive team, and a company that truly values your input. Ready for the next step? Apply now and start an exciting journey of growth and innovation with us!

🏢 Summary: Full Stack Developer role focused on building and maintaining scalable, cloud-based applications for enterprise data exchange with external government systems. The position involves developing Java (Spring Boot) services, REST APIs, frontend components, and data synchronization processes within a microservices architecture. It includes working in an Agile team and contributing to CI/CD pipelines and automated testing. 🗂️ Requirements: 3+ years experience as Full Stack Developer, Strong proficiency in Java, Experience with Spring Boot, Experience with REST APIs, Experience with microservices architecture, Experience with relational databases, Experience with PostgreSQL, Experience with Node.js, Experience with modern frontend frameworks, Experience with React, Familiarity with CI/CD pipelines, Experience with GitLab CI, Experience with event-driven systems or messaging solutions, Familiarity with AWS, Experience in Agile/Scrum teams 📃 Skills: Java, Spring, SpringBoot, REST, Microservices, PostgreSQL, SQL, Node.js, JavaScript, TypeScript, React, AWS, Git, GitLab, CI/CD, Messaging, Scrum 🏢 Description: 🚀 Java Full Stack Developer (Maternity Cover) Location: Poland - Hybrid (Kraków) Contract: B2B, Full-Time Join the Future of Digital Tech with Kolomolo At Kolomolo , we don’t just follow trends - we set them. As a global supplier of IT services and digital modernization solutions, we help businesses embrace cutting-edge technology to optimize their operations. Now, we are growing and looking for fresh talent to grow with us. Are you proactive, tech-savvy, and eager to build your career in IT? This role could be your perfect fit. About the Role Kolomolo is looking for a Java Full Stack Developer to join an international project team delivering modern digital services for a large-scale, enterprise environment. This is a maternity cover position , offering the opportunity to work on high-impact systems, collaborate with senior engineers, and contribute to the development and maintenance of scalable applications. You will be working on a platform responsible for exchanging operational data between our product and external government systems. The solution enables: Two-way data synchronization (both manual and automated) Visibility into pending work items Access to historical records Validation of both system-generated and manually entered data This is a full-stack role with a strong focus on Java, offering the opportunity to work across the entire application and contribute to its evolution. You will be involved in both backend and frontend development, working within a cloud-based architecture and Agile delivery model. What You’ll Be Doing Designing, building, and maintaining application services and APIs using Java (Spring Boot) Developing and enhancing data synchronization processes and system integrations Extending and maintaining existing application components Ensuring performance, scalability, and reliability of the system Contributing to CI/CD pipelines and deployment processes Writing and maintaining automated tests (unit and integration) Collaborating across the application stack to deliver cohesive solutions Tech Stack Frontend: JavaScript / TypeScript, React (or similar) Backend: Node.js Cloud: AWS (preferred) Architecture: Microservices Tools: Git, CI/CD pipelines, modern testing frameworks What We Are Looking For 3+ years of experience as a Full Stack Developer. Strong proficiency in Java. Experience with REST APIs and microservices architecture. Experience with relational databases (e.g., PostgreSQL) Familiarity with CI/CD pipelines (e.g., GitLab CI) Experience with event-driven systems or messaging solutions Strong grasp of software design, scalability, and performance principles Experience with Node.js on the backend. Experience with modern frontend frameworks (e.g., React). Understanding of REST APIs and web services. Familiarity with cloud environments (AWS preferred). Experience working in Agile/Scrum teams. Strong problem-solving skills and attention to detail. Good communication skills in an international environment. Nice to Have Experience with serverless architecture Knowledge of microservices-based systems Experience with automated testing (unit/integration) Exposure to DevOps practices and CI/CD What is in It for You Competitive salary and benefits. Career development opportunities in a growing tech company. Continuous learning culture: mentorship, internal training, and certifications. Flexible, agile work environment (remote, hybrid, or on-site in Kraków). Office perks: great coffee, tea, fresh fruit, snacks, and a fun atmosphere. Flat management structure, where your voice matters. Regular team events and a social, supportive work culture. B2B contract or Contract of Mandate (Umowa Zlecenie). 🌟 Why Join Kolomolo? At Kolomolo , we prioritize innovation, agility, and autonomy. Our teams have the freedom to own their work, share ideas, and make meaningful contributions. Inspired by Scandinavian values , we believe in work-life harmony and creating an inclusive culture where everyone thrives. You will be part of a passionate, skilled, and friendly team that works hard and celebrates together. Here, you can build your career on your own terms, with opportunities to grow, learn, and make a real impact. Our Flat Structure & The Culture of Inclusion At Kolomolo, we break the corporate mold. We offer: Agile Teams & Autonomy : No micromanagement. You’ll own your projects and enjoy the freedom to innovate. Work-Life Harmony : Inspired by Scandinavian values, we prioritize balance and flexibility, where remote work and asynchronous collaboration are in our DNA. Learning & Growth : Continuous learning is at our core. We reward hard work, value smart ideas, and foster an environment of mutual respect and trust. Inclusive Culture : We believe in DEI: diversity, equity and inclusion. We are committed to creating an environment where every individual, regardless of background, identity, or experience feels valued, respected, and empowered to thrive. Join Kolomolo and elevate your career with cutting-edge technology, a supportive team, and a company that truly values your input. Ready for the next step? Apply now and start an exciting journey of growth and innovation with us!

🏢 Summary: Junior Back-End Developer role focused on building and enhancing production-level microservices within a modern, cloud-based gaming platform stack. The position involves working with Java and Spring Boot in a microservices architecture, ensuring observability and scalability of backend services. It offers hands-on experience with cutting-edge infrastructure and cloud technologies in a collaborative environment. 🗂️ Requirements: Minimum 1 year experience with Java, Solid understanding of backend web development, Knowledge of data structures and algorithms, Ability to develop and maintain microservices, Understanding of REST or RPC-based communication, Experience with containerized environments, Ability to work with relational databases 📃 Skills: Java, Spring, SpringBoot, Microservices, Kubernetes, Docker, Redis, PostgreSQL, Kafka, AWS, GCP, gRPC, Grafana, Alertmanager 🏢 Description: Kickstart your career at our Krakow Studio! At Kalamba Games, we're building the most high-performing stack in the industry across Game Development, RGS Platform, QA, and Art. Based in Krakow, our studio is home to a fun-loving, agile, and experienced team driven by a passion to disrupt the market through cutting-edge technology. We're all about collaboration, innovation, and having a great time while doing amazing work. If you're looking for a place to grow, learn, and make an impact from day one—read on! We're hiring: Junior Back-End Developer (immediate start) Are you a natural problem solver? Do you enjoy diving into new tech and tackling challenges head-on? We're looking for a motivated Junior Back-End Developer to join our growing team. What you'll be working with You'll be hands-on with some of the latest and greatest technologies in the industry: Languages & frameworks: Java 21, Spring Boot, Microservices architecture Infrastructure: Kubernetes, Docker, Redis, PostgreSQL, Kafka Cloud platforms: AWS, Google Cloud Platform Communication & observability: gRPC, Grafana, Alertmanager What you'll do Work on meaningful, production-level tasks that directly impact our products. Develop new microservices and enhance existing ones. Make your services observable with custom dashboards and alert rules. Learn fast and tackle unfamiliar tasks with curiosity and independence. And most importantly—have fun doing it! What we're looking for At least 1 year of experience with Java. Solid understanding of backend web development. Knowledge of data structures, algorithms, and problem-solving fundamentals. Passion, motivation, and eagerness to grow in a collaborative environment. What You'll Get as a Kalambian Employment contract or B2B — your choice 26 days of vacation (regardless of seniority) 1 additional paid day off for each year you're with us Private healthcare Subsidized MultiSport card Flexible working hours and remote work options Game room , snacks, and a fully-equipped kitchen Hybrid work model: We'd love to see you in our Kraków office at least 4 days a week during your first 3 months Let's build something great together If you're ready to take your career to the next level and be part of something exciting, we want to hear from you. Join us and help shape the future of gaming tech—one line of code at a time. Apply now and let's get the ball rolling!

🏢 Summary: Senior Full Stack Developer role in a hybrid model (Kraków) focused on building and maintaining scalable, mission-critical financial applications. The position involves end-to-end development, from analysis to deployment and support, using Java, React, and SQL. You will contribute to high-quality full-stack solutions while ensuring performance, stability, and adherence to best practices. 🗂️ Requirements: Minimum 5 years of full-stack development experience, Proficiency in Java, Proficiency in SQL, Proficiency in React, Working knowledge of UNIX environments, Understanding of HTTP APIs and RESTful services, Experience with end-to-end software development lifecycle, Fluent English, Legal right to work in the European Union 📃 Skills: Java, React, SQL, Kotlin, UNIX, HTTP, REST, DevOps 🏢 Description: Unleash Innovation — Drive Impact as a Senior Full Stack Developer in Kraków! Kraków-based opportunity with hybrid work model (up to 3 days remote). As a Senior Full Stack Developer , you will be working for our client, a leader in Global Markets Technology, focused on delivering robust, scalable solutions that empower financial services worldwide. Join a dynamic team where your expertise will shape mission-critical applications, enhance operational efficiency, and foster digital transformation. Your main responsibilities: Collaborate within a dedicated team of 4–6 developers, taking ownership of all development phases from analysis to deployment and support. Break down business requirements into user stories and deliver iterative enhancements to production. Design, develop, and optimize full-stack solutions using Java, React, and SQL, ensuring high-quality code and adherence to best practices. Identify and address technical debt, balancing new features with system stability and performance. Participate in pair programming and code reviews to foster knowledge sharing and code excellence. Support existing applications post-deployment, ensuring continuous functionality and performance improvements. Follow technology guidelines and constraints, ensuring solutions are scalable, maintainable, and aligned with project standards. You're ideal for this role if you have: At least 5 years of professional experience in full-stack development or related fields. Strong proficiency in Java, SQL, and React; familiarity with Kotlin is a plus. Working knowledge of UNIX environments. Good understanding of HTTP APIs, particularly RESTful services. Demonstrated willingness to learn new programming languages and frameworks. Excellent communication skills in English. It is a strong plus if you have: Experience with DevOps practices or familiarity with other programming languages. Relevant certifications or training related to full-stack development. Language Required for the role: Fluent English (verbal and written). Eligibility to work in this role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Short-term B2B contract for a Fullstack Developer (Node.js + TypeScript) to build and maintain backend services for a regulated digital capital market platform in the fintech domain. The role focuses on developing scalable APIs, integrating KYC/AML providers, and implementing authentication, authorization, and investor management features. The project emphasizes code quality, security, and collaboration with cross-functional teams. 🗂️ Requirements: 3+ years commercial experience with Node.js, Strong knowledge of TypeScript, Experience building REST APIs, Experience with NestJS or similar framework, Experience with Prisma ORM or similar ORM, Understanding of authentication and authorization, Experience with relational databases, Experience writing automated tests, Knowledge of clean code principles, English for daily communication 📃 Skills: Node.js, TypeScript, NestJS, Prisma, REST, SQL, Jest, Supertest, Authentication, Authorization 🏢 Description: Description We are a technology company that started its journey in 2008. Our main headquarters is located in the picturesque city of Poznań, nestled by the beautiful Malta lake. For more than 17 years, we have been assisting companies in developing and implementing innovative fintech solutions. Leveraging our expertise in areas such as blockchain, online payments, and more, our clients can invent and develop cutting-edge solutions and services that keep them at the forefront of innovation. FULLSTACK DEVELOPER B2B: 80-100 PLN / hour START - 1 JULY TERM - 6 WEEKS LOCATION: POLAND (REMOTE) *We offer a hybrid work model, allowing you to balance office presence with remote work. However, it's important to note that the role emphasizes a stronger presence in the office to foster teamwork and effective communication. Requirements Key Duties and Services: A Roadmap to Your Professional Success Your Mission : We are looking for a Fullstack Developer (Node. js + TypeScript) to join a fintech project focused on building a regulated digital capital market platform. The system supports investor onboarding, KYC/AML verification, investor classification, access control, audit logging, and digital wallet infrastructure. You will work closely with senior engineers and architects to build scalable backend services and integrations with fintech and blockchain-related providers. Scope of services: Developing and maintaining backend services using Node. js + TypeScript Building and extending REST APIs for onboarding, authentication, and user management Integrating external KYC/AML and identity verification providers Implementing business logic for investor classification and access control Creating and maintaining database models using Prisma ORM Writing unit and integration tests (Jest, Supertest) Participating in code reviews and technical discussions Collaborating with frontend, mobile, QA, and product teams Supporting code quality, security, and system reliability Here’s the set we are required: 3+ years of commercial experience with Node. js backend development Strong knowledge of TypeScript Experience building REST APIs and backend systems Experience with NestJS or similar frameworks Experience with Prisma ORM or similar Understanding of authentication & authorization concepts Familiarity with relational databases Experience writing automated tests (Jest, Supertest or similar) Strong understanding of clean code principles and best practices Good communication skills and English for daily cooperation Nice to have: Experience with class-validator / DTO-based validation Familiarity with GraphQL (Apollo) Experience in fintech / banking / regulated environments Knowledge of KYC/AML processes Exposure to blockchain, wallets, or digital assets Career Advancement at Your Fingertips: Explore Opportunities with Us By joining us you will get: Work on a modern fintech platform with real regulatory requirements Collaboration with experienced senior engineers and architects Opportunity to work with KYC/AML, identity systems, and fintech integrations Influence on system design and backend architecture decision A strong engineering culture focused on quality, security, and scalability Navigating the Hiring Process: What does the recruitment process for that position look like? HR Screening with Talent Acquisition Specialist (30 min) Technical Interview (60 min) Interview with Delivery Manager (30 min) Job Offer

🏢 Summary: Hybrid Fullstack Developer role focused on building and maintaining scalable web applications using Java and React.js. The position involves designing backend services and RESTful APIs, developing modern frontend interfaces, and contributing to CI/CD and DevOps practices. Work includes testing, performance optimization, and collaboration on architecture and microservices. 🗂️ Requirements: Strong experience with Java and Spring Boot, Solid experience with React.js and state management, Experience designing and consuming RESTful APIs, Experience with microservices architecture, Proficiency in JavaScript, HTML5, CSS3, Experience with relational or NoSQL databases, Knowledge of unit and integration testing practices, Experience with CI/CD pipelines, Familiarity with Git and version control workflows, Ability to work with Agile/Scrum methodologies 📃 Skills: Java, Spring, SpringBoot, React, Redux, JavaScript, HTML5, CSS3, Webpack, Babel, ESLint, JUnit, Mockito, Jest, MySQL, PostgreSQL, NoSQL, Git, CI/CD, Docker, Kubernetes, AWS, Azure, GCP, Kafka, GraphQL, WebSocket 🏢 Description: We are looking for a highly skilled Fullstack Developer with expertise in Java and React.js to join our Kraków-based development team. You will design, develop, and maintain scalable, high-performance web applications, contributing to both backend services and rich frontend interfaces. This role follows a hybrid working model , with 2–3 days per week onsite in Kraków. Key Responsibilities Backend Development: Architect, implement, and maintain backend services using Java , Spring Boot , and related frameworks Frontend Development: Build responsive, modular, and maintainable React.js applications with a focus on component-driven design Design and implement RESTful APIs and microservices , ensuring high performance, security, and scalability Collaborate with cross-functional teams to define technical requirements , system architecture, and feature implementation Apply unit testing, integration testing, and end-to-end testing best practices (JUnit, Mockito, Jest, React Testing Library) Participate in code reviews , enforce coding standards, and promote best practices in clean code, SOLID principles, and design patterns Troubleshoot and optimize application performance and resolve production issues Manage CI/CD pipelines , automate deployments, and support DevOps practices Stay up-to-date with emerging technologies and frameworks to continuously improve application architecture Required Skills and Experience Strong experience with Java , Spring Boot , and related backend frameworks Solid experience with React.js , Redux , or state management libraries Proven experience in designing and consuming RESTful APIs and microservices architecture Proficient in JavaScript, HTML5, CSS3, and modern frontend tooling (Webpack, Babel, ESLint) Experience with relational databases (MySQL, PostgreSQL) and/or NoSQL databases Familiarity with Git , version control workflows, and Agile/Scrum methodologies Understanding of unit testing, integration testing, and test-driven development (TDD) Good problem-solving and communication skills in English Nice to Have Experience with TypeScript and advanced React patterns (Hooks, Context API, Suspense) Knowledge of Docker , Kubernetes , or cloud platforms (AWS, Azure, GCP) Experience with event-driven architectures , message queues , or Kafka Familiarity with GraphQL or WebSocket-based real-time applications

🏢 Summary: Senior Backend Java Developer role focused on designing and building scalable, high-performance backend systems using Java and Spring Boot in a cloud-native environment. The position involves developing enterprise-grade solutions, ensuring performance and security, and supporting containerized deployments. The role requires strong experience with modern backend technologies and infrastructure tools. 🗂️ Requirements: 8+ years of backend development experience, Strong experience with Java 17+, Strong experience with Spring and Spring Boot, Experience with Spring Security, Experience with SQL databases, Experience with Maven, Experience with Git and CI/CD pipelines, Experience with testing frameworks (JUnit, AssertJ, Hamcrest), Experience with Kubernetes and Helm, Experience with Bash or Shell scripting, Experience with cloud-native applications, Experience in enterprise environments 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, SQL, Maven, Git, CICD, JUnit, AssertJ, Hamcrest, Kubernetes, Helm, Bash, Shell, Docker, PostgreSQL 🏢 Description: Senior Backend Java Developer Location: Warsaw, Poland (hybrid – 2 days/week in the office) About the Role We’re looking for a Senior Backend Java Developer to design and build scalable, high-performance backend systems for international products. You’ll work in a collaborative environment, contribute to architectural decisions, and mentor other engineers. Responsibilities Design, develop, and maintain backend systems using Java 17+ and Spring Boot Ensure scalability, performance, and security of solutions Work with SQL databases (e.g. PostgreSQL) Support deployments using Docker, Kubernetes, and Helm Use Bash/Shell for automation and integration tasks Lead technical discussions and mentor team members Collaborate in Agile (Scrum) teams and communicate in English Requirements Strong experience with Java 17+, Spring / Spring Boot / Spring Security Experience with cloud-native applications Maven, SQL, Git (GitHub, CI/CD) Testing frameworks (JUnit, AssertJ, Hamcrest) Kubernetes, Helm Bash/Shell scripting English B2/C1 Experience in enterprise environments 8+ years of backend development experience Nice to Have PostgreSQL, Hibernate/JPA Kafka, event-driven architecture Microservices architecture Python Knowledge of C or Go CI/CD tools, JIRA Monitoring tools (Grafana, Prometheus, Kibana) Security best practices (OWASP) Qualifications Degree in Computer Science or related field

🏢 Summary: Full Stack Developer role focused on building scalable, cloud-native APIs and data pipelines in AWS using TypeScript and serverless architecture. The position involves developing and maintaining backend services, infrastructure as code, and CI/CD processes in a fully remote, long-term project. The role also includes partial development of Java services and working within a SAFe Agile environment. 🗂️ Requirements: Proven experience as Full Stack Developer, Strong proficiency in TypeScript and Node.js, Hands-on experience with AWS services: Lambda, S3, StepFunctions, EventBridge, DynamoDB, APIGateway, CDK, Experience with CICD tools such as GitHubActions or Bamboo, Strong SQL skills and experience with PostgreSQL, Experience with NoSQL databases, Ability to develop and maintain Java services, Understanding of serverless and event-driven architecture, Experience with OpenAPI or Swagger, Experience with authentication and authorization frameworks such as Auth0, AzureAD, PingIdentity, Experience working in SAFe Agile environment, EU citizenship and residence in Poland 📃 Skills: TypeScript, Node.js, AWS, Lambda, S3, StepFunctions, EventBridge, DynamoDB, APIGateway, CDK, PostgreSQL, SQL, MongoDB, CICD, GitHubActions, Bamboo, Java, Python, OpenAPI, Swagger, Auth0, AzureAD, PingIdentity, Serverless, SAFe 🏢 Description: In Cyclad we work with top international IT companies in order to boost their potential in delivering outstanding, cutting-edge technologies that shape the world of the future. We are seeking for an experienced Full Stack Developer (TypeScript&AWS) to join a fully remote l development team delivering scalable, cloud-native solutions. The role focuses on building modern APIs and data pipelines using serverless and event-driven architecture within AWS environment. Project information: Type of project: IT Services Office location: Warszawa, Poland Work mode: Remote Budget: 100-120 PLN net/h - b2b Project length: Long-term Only candidates with citizenship in the European Union and residence in Poland Start date: ASAP (depending on candidate availability) Project scope: Design, develop, and maintain APIs using TypeScript (Node.js) and serverless architecture patterns Build and manage data ingestion pipelines using AWS Lambda, S3, PostgreSQL, and Step Functions Implement infrastructure as code using AWS CDK Collaborate with DevOps teams to manage deployments via CI/CD tools (GitHub Actions/Bamboo) Use AWS SDKs to integrate AWS services within application code Develop and maintain Java-based services where required (approximately 20% of the role) Work with NoSQL databases such as DynamoDB or MongoDB, as well as relational databases Ensure robust data validation, error handling, and orchestration in pipelines Document APIs using OpenAPI/Swagger for seamless front-end/back-end integration Implement secure authentication and authorization mechanisms (Auth0 or similar solutions) Participate in SAFe Agile ceremonies including PI Planning, Sprint Planning, Daily Stand-ups, and Retrospectives Collaborate cross-functionally with Product Owners, Scrum Masters, and development teams Requirements: Proven experience as a Full Stack Developer or similar role Strong proficiency in TypeScript (Node.js) Hands-on experience with AWS services: Lambda, S3, Step Functions, EventBridge, DynamoDB, API Gateway, and CDK Experience with CI/CD tools such as GitHub Actions or Bamboo Strong SQL skills and experience with relational databases (PostgreSQL preferred) Experience working with NoSQL databases Ability to develop and maintain Java services; Python knowledge is a plus Understanding of data validation, error handling, and pipeline orchestration Familiarity with authentication and authorization frameworks (Auth0, Azure AD, Ping Identity, or similar) Strong analytical thinking and problem-solving skills Excellent communication skills and ability to work in cross-functional teams Experience working in a SAFe Agile environment and understanding Lean-Agile principles We offer: Opportunity to work on modern, cloud-native AWS projects Fully remote working model Full-time job agreement based on on b2b Private medical care with dental care (covering 70% of costs) Multisport card (also for an accompanying person) Life insurance

🏢 Summary: Full-time Backend Developer role focused on building and maintaining scalable Node.js and TypeScript applications for US clients across various industries, including MVP-stage products. The position involves designing backend architecture, working with SQL/NoSQL databases, and collaborating in Scrum teams in a flexible, remote-first environment. The offer includes long-term cooperation and participation in diverse, technically challenging projects. 🗂️ Requirements: 2+ years commercial experience in Node.js, Experience with Node.js frameworks (Express.js, NestJS or similar), Strong proficiency in TypeScript, Experience with SQL databases, Experience with NoSQL databases, Knowledge of SOLID and KISS principles, Knowledge of design and architecture patterns, Experience with Docker, Experience with GitHub Actions, Basic experience with AWS services, Ability to use ORM or query builders (e.g. Prisma, Knex), English level B2, Polish level C1 📃 Skills: Node.js, TypeScript, JavaScript, Express, NestJS, Fastify, SQL, NoSQL, Prisma, Knex, Docker, AWS, GitHub, GitHubActions, React 🏢 Description: We are looking for skillful Backend Developers to join one of our teams working with US clients - referrals from the high-end American IT market. Our tech stack is built around React, Node.js and TypeScript. We are working with well-established companies and sometimes startups in their early stages (MVPs), which makes the job full of diversity and exciting challenges while crafting cutting-edge solutions. Enjoy the flexibility of working within the Polish time zone and collaborate with clients from diverse industries such as FinTech, SportsTech, MedTech, and many others. Required skills: 2+ years of commercial experience in Node.js, SQL and NoSQL DBs, knowledge of JS frameworks (e.g Express.js, NestJS), experience in TypeScript, SOLID and KISS, knowledge about design and architecture patterns, know how and why Docker and GitHub Actions works, basic usage of AWS services, English B2, Polish C1 Offer: B2B/UZL, paid days off, 100% remote (or hybrid/onsite - as you prefer), Polish time zone, flexible hours, full-time position, long-term contract, Scrum Teams Perks and Benefits: Budgets for self-development, integrations, healthcare & sport activities, Mentoring Program, Individual Career Path, Paid Time Off, Paid Health Break & more Tools you'll use: Apple MacBook Pro, Slack, GSuite, GitHub, Jira, Coda, FigJam Your future tasks and duties: Writing readable and easy-to-maintain JS/TS code with OOP flavor Writing documentation for delivered code Code review of other developers in the team Direct involvement with the design and modification of basic DB structures Propose improvements and share proactive ideas/solutions with the team to enhance the team's work processes Share insights with the team to diagnose issues and focus on solutions Actively participate in project discussions Listen to the client's needs and, after consulting the team, suggest solutions Support less experienced team members About you - Tech skills & Experience: 2+ years of commercial experience in Node.js Good experience with at least one Node.js backend framework (e.g. Express.js, NestJS, Fastify, etc) - you know most of its basic APIs/features, worked on at least 1-2 projects involving such technologies Strong proficiency in TypeScript. You have practical experience with static typing, advanced types, and configuring TS compilers, treating it as your primary language to build robust and type-safe backend applications Potentially worked with NoSQL databases and/or in-memory databases and utilized them as a data store Worked with SQL databases (integration-wise and as a basic design skill) with ORM or query builder tool (ie. Prisma, Knex) Knows the basics of building AI applications (RAG, Agents, etc.) Use AI effectively in their work About you - Soft Skills: English level B2 to cooperate with American clients Polish level C1 to communicate easily within the team Open-minded to new challenges (e.g. different frameworks) Understand the significance of MVP and prioritize the pursuit of excellence and high-quality outcomes, even amid tight project timelines. Communicate with the team to efficiently translate business complexities (user stories/tasks) into solutions (results/estimations) Staying on top with trends/news, sharing them, teaching others and aiming for the best quality solutions Strong problem-solving abilities to diagnose issues, suggest solutions, and make decisions based on project requirements Nice to have: Worked in Agile/Scrum on a daily basis consisting of people with similar skills and monitoring code quality on a daily basis Basic experience with AWS - used some services in specific cases Basic experience with Docker - know how to prepare and debug the environment and connect things up to work locally Worked in the very beginning of the product development/creation stage Understand the significance of MVP and aim to deliver top-notch results, even amid tight project timelines Recruitment process: CV Review Phone call with our Recruiter (15min) Soft-skills interview with our Recruiter (1h) Technical interview with our Specialists (2h) Decision and feedback 🥳 Meaningful projects, top-notch experts and value-driven workplace Sound good? 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🏢 Summary: Mid-level Full-Stack Developer role focused on building and modernizing a cloud-based practice management and CRM platform. The position involves a 60/40 split between Angular frontend and Node.js/Nest.js backend, contributing to migration from monolith to microservices and upgrading to the latest Angular version. Fully remote (Poland-based) with strong impact on architecture and product quality. 🗂️ Requirements: 2–3 years of commercial experience in full-stack web development, Commercial experience or strong willingness to work with Angular, Experience with Node.js backend development, Practical knowledge of Nest.js, Basic knowledge of SQL, Experience or willingness to implement automated E2E tests, Polish residency, Working proficiency in Polish, Notice period of 1 month or less 📃 Skills: Angular, Node.js, Nest.js, SQL, Playwright, Microservices, Cloud, ORM, E2E 🏢 Description: Position: Full-Stack Developer Location: Remote (Poland-based) Salary: 14500 – 19500 PLN / month Our client is an innovative software company delivering a modern, cloud-based practice management and CRM solution dedicated to professional services. The platform streamlines day-to-day operations, including workload management and automated document generation. The development team is highly autonomous, focused on refactoring their core product from a monolith into scalable microservices, migrating to the newest technology stacks, and fostering an environment with strong developer ownership. We are looking for a mid-level Full-Stack Developer (approx. 2–3 years of commercial experience) to join a tight-knit Polish development team. In this role, you will work on both frontend and backend tasks (approx. 60% Front-End and 40% Back-End workload), having a real impact on technology choices and product quality. Requirements: Around 2–3 years of commercial experience in full-stack web development. Professional experience or strong openness to working with Angular (the project is currently on Angular 6 and undergoing a migration to the latest stable version). Solid knowledge of backend development using Node.js, preferably with Nest.js (used for all new microservices). Basic understanding of SQL (complex queries are supported by in-house ORM and AI tools, backed by thorough code reviews). Familiarity with or interest in testing practices (manual testing with beta users and expanding automated E2E tests using Playwright ). Polish residency and working proficiency in Polish (mandatory for active participation in daily sync meetings). Notice period of 1 month or less . Mindset focused on autonomy, taking ownership of tasks, and willingness to challenge the status quo. Responsibilities: Developing new features and maintaining the cloud-based platform (60% FE / 40% BE split). Actively participating in architecture modernization (refactoring the monolith into microservices and migrating the legacy frontend to the latest Angular version). Writing clean, maintainable code and participating in peer code reviews. Ensuring software quality through self-testing and implementing automated E2E test scenarios with Playwright. Onboarding smoothly into the codebase (handling smaller bug fixes and minor features in Month 1, progressing to designing and delivering a major complex feature by Month 3). Attending daily team synchronization meetings (at 10:00 AM Polish time). Offer: Salary: 14500 – 19500 PLN / month (depending on experience). Contract type: Long-term B2B Contract (open to both permanent-like cooperation and 12-month fixed contracts). Working model: 100% Fully Remote work. Flexible working hours (with core presence during the 10:00 AM daily sync). Hardware: Company-provided laptop and necessary equipment. No on-call duties or weekend shifts. Great culture: High levels of engineering autonomy, flat structure, and direct impact on the final product. Fast recruitment process: 3 stages (1h Live Coding data processing task $\rightarrow$ ~3h Homework assignment $\rightarrow$ 1h final CTO interview) with rapid feedback provided within 1–2 business days after each stage.