Fullstack Developer (backend-focused) (f/m)

🏢 Summary: Oferta dotyczy rozwoju i utrzymania aplikacji backendowych w Java i Spring Boot, opartych na architekturze mikroserwisowej. Rola obejmuje projektowanie REST API, testowanie, automatyzację CI/CD, konteneryzację Docker oraz współpracę przy dostarczaniu bezpiecznych rozwiązań. 🗂️ Requirements: Minimum 3 lata komercyjnego doświadczenia w Java, Bardzo dobra znajomość Java 8+, Praktyczne doświadczenie w tworzeniu aplikacji backendowych, Doświadczenie ze Spring Boot, Doświadczenie w architekturze mikroserwisowej, Znajomość Oracle, PostgreSQL lub MongoDB, Umiejętność projektowania i implementacji funkcjonalności od podstaw, Doświadczenie w testach jednostkowych, Znajomość wzorców projektowych i dobrych praktyk, Praktyczna znajomość Git i CI/CD, Umiejętność projektowania i implementacji REST API, Znajomość podstaw bezpieczeństwa aplikacji, Biegła znajomość języka polskiego, Angielski umożliwiający pracę z dokumentacją techniczną 📃 Skills: Java, Spring, SpringBoot, Microservices, REST, API, Oracle, PostgreSQL, MongoDB, NoSQL, Git, CI/CD, Jenkins, GitLab, Docker, OWASP, JUnit 🏢 Description: W TSS napędzamy cyfrową rewolucję. Tworzymy zaawansowane systemy i innowacyjne rozwiązania z zakresu Software Development, FinTech, AI. Zakres odpowiedzialności: Tworzenie oprogramowania: Projektowanie, rozwój i utrzymanie aplikacji backendowych w technologii Java oraz Spring Boot. Architektura mikroserwisowa: Współtworzenie i rozwijanie rozwiązań opartych o mikroserwisy, REST API oraz nowoczesne wzorce projektowe. Jakość przede wszystkim: Pisanie czytelnego, wydajnego i łatwego w utrzymaniu kodu zgodnie z dobrymi praktykami programistycznymi. Testowanie i niezawodność: Tworzenie oraz rozwijanie testów jednostkowych, współpraca z zespołem testowym oraz dbanie o wysoką jakość dostarczanych rozwiązań. Automatyzacja procesów: Praca w środowisku CI/CD z wykorzystaniem narzędzi takich jak Jenkins czy GitLab CI. Konteneryzacja i wdrożenia: Udział w przygotowywaniu i wdrażaniu aplikacji z wykorzystaniem technologii Docker. Praca zespołowa: Ścisła współpraca z analitykami, testerami, architektami oraz innymi programistami przy realizacji projektów informatycznych. Bezpieczeństwo aplikacji: Stosowanie zasad bezpiecznego programowania oraz znajomości standardów OWASP Top 10 podczas tworzenia rozwiązań. Wymagania: Solidne doświadczenie komercyjne: Minimum 3 lata doświadczenia w programowaniu w języku Java - bardzo dobrą znajomość Java 8+ oraz praktyczne doświadczenie w budowie aplikacji backendowych. Znajomość Spring Boot i mikroserwisów: Praktyczne doświadczenie w projektowaniu i rozwoju rozwiązań opartych o architekturę mikroserwisową. Umiejętności bazodanowe: Dobrą znajomość baz danych Oracle, PostgreSQL i/lub rozwiązań NoSQL (np. MongoDB). Samodzielność techniczną: Umiejętność projektowania oraz implementacji nowych funkcjonalności i całych komponentów systemu od podstaw. Podejście jakościowe: Doświadczenie w pisaniu testów jednostkowych oraz stosowaniu wzorców projektowych i dobrych praktyk programistycznych. Znajomość narzędzi developerskich: Praktyczne doświadczenie w pracy z Git oraz środowiskami CI/CD. Znajomość REST: Umiejętność projektowania i implementacji usług REST API. Świadomość bezpieczeństwa: Znajomość podstaw bezpieczeństwa aplikacji Komunikację i współpracę: Umiejętność efektywnej pracy w zespole programistycznym oraz współpracy z zespołami testowymi. Znajomość języków: Biegłe posługiwanie się językiem polskim oraz znajomość języka angielskiego pozwalająca na swobodną pracę z dokumentacją techniczną. Dodatkowym atutem będzie: Doświadczenie z rozwiązaniami chmurowymi oraz nowoczesnymi platformami wdrożeniowymi. Znajomość zagadnień DevOps i automatyzacji procesów dostarczania oprogramowania. Doświadczenie w optymalizacji wydajności aplikacji oraz analizie problemów produkcyjnych. Praktyka w pracy przy dużych projektach enterprise realizowanych dla sektora publicznego lub komercyjnego. Otwartość na dzielenie się wiedzą oraz aktywne wspieranie rozwoju zespołu. Co zyskujesz, dołączając do teamu? Stabilność i elastyczność: Długofalową współpracę w oparciu o kontrakt B2B. Realny wpływ: Pracę nad kluczowymi projektami, gdzie Twoje decyzje architektoniczne kształtują finalny produkt. Zdrowie pod kontrolą: Dofinansowanie do prywatnej opieki medycznej w PZU. Stały rozwój: Dostęp do wewnętrznych, specjalistycznych szkoleń z zakresu m.in . cyberbezpieczeństwa. Środowisko entuzjastów: Pracę w zespole, gdzie pasja łączy się z profesjonalizmem, a dobra atmosfera to standard, nie benefit.

🏢 Summary: Support the design and delivery of an evolving full-stack platform, building features and integrations in close collaboration with the engineering manager and stakeholders. The role requires independent technical leadership, secure API integration practices, and regular overlap with European working hours. 🗂️ Requirements: Fluent written and spoken English, Full-stack frontend and backend/integration experience, REST API experience, OAuth 2.0 and app registration experience, Secure credential management, Ability to build and demo with mock/offline data, Independent, proactive technical communication with IT stakeholders, Daily 5–6 hour overlap with CET/GMT, Strong communication with non-technical audiences 📃 Skills: JavaScript, Vite, REST, OAuth, APIs, KeyVault, Integrations, Frontend, Backend 🏢 Description: Your responsibilities: Support the design and implementation of a platform currently being developed by the team, working closely with its EM to define priorities and next steps. Contribute to the build-out of features and integrations as scoped, adapting to the platform’s evolving needs and roadmap. Translate technical direction into working code, flagging risks, blockers, or open questions early. Document key technical decisions and progress to keep the team aligned as the platform takes shape. Collaborate with the team and other stakeholders to validate deliverables and incorporate feedback. We are looking for you, if you have: Fluent English — written and verbal (working language of the team). Fullstack profile — comfortable with both front-end (JS/Vite or similar) and back-end/integration work. Experience with REST APIs, OAuth 2.0, and app registrations. Secure credential management — key vault, environment variables, never in front-end code. Able to build and demo with mock/offline data while waiting for real API access. Independent and proactive — able to lead technical conversations with IT without hand- holding. Strong communication skills — can explain technical decisions to a non-technical audience. Available for at least 5–6 hours of overlap with European timezone (CET/GMT) daily. Nice to Have Familiarity with Microsoft 365 ecosystem (Graph API, SharePoint, Power Automate). Experience with Jira REST API or Atlassian ecosystem. Knowledge of ServiceNow Table API. Experience deploying to AWS or similar cloud environment. We offer: Participation in interesting and demanding projects. Flexible working hours. A great, non-corporate atmosphere. Possibility to work remote or hybrid (2 days per week from the office). Opportunities for development and promotion. Attractive package of benefits. We reserve the right to contact the selected candidates.

🏢 Summary: Full Stack Developer role focused on building scalable Java and React applications, including backend microservices, responsive frontend architecture, REST integrations, and AWS-based operations. The offer includes long-term international project work, flexible hours, modern tooling, and influence over architectural decisions. 🗂️ Requirements: 4–5 years of professional software development experience, Commercial Java experience, Commercial Spring Framework experience, Commercial Spring Boot experience, Commercial React.js experience, Commercial TypeScript experience, JavaScript ES6+ knowledge, Production AWS experience, Microservices architecture knowledge, SQL and relational database experience, REST API integration experience, HTML5, CSS3/SCSS, responsive design, and cross-browser compatibility knowledge, Jest and React Testing Library experience, Modern frontend tooling and build process familiarity, Agile environment experience 📃 Skills: Java, Spring, SpringBoot, React, TypeScript, JavaScript, AWS, SQL, HTML5, CSS3, SCSS, Jest, Kafka, Hadoop, Spark, Next.js, Redux, Zustand 🏢 Description: ✅ Your responsibilities: Design, develop, and maintain scalable full stack applications using Java and React. Build and maintain backend services with Java, Spring Framework, Spring Boot, SQL, and AWS. Develop modern, reusable, and responsive user interfaces using React, TypeScript, and JavaScript. Design and implement scalable frontend architecture and reusable UI components. Collaborate closely with Product Owners, QA Engineers, and other development teams. Integrate frontend applications with REST APIs and backend microservices. Contribute to architectural decisions and technical discussions. Ensure application performance, scalability, security, and maintainability. Participate in code reviews, sprint planning, and Agile ceremonies. Support deployment automation, production operations, and troubleshooting. Mentor less experienced developers and promote engineering best practices. 🧠 Our requirements: Minimum 4–5 years of professional software development experience. Commercial experience with Java, Spring Framework, and Spring Boot. Commercial experience with React.js and TypeScript. Solid understanding of JavaScript (ES6+). Experience working with AWS in production environments. Understanding of microservices architecture. Hands-on experience with SQL and relational databases. Experience integrating and consuming REST APIs. Very good knowledge of HTML5, CSS3 / SCSS, responsive design, and cross-browser compatibility. Experience with frontend testing using Jest and React Testing Library. Familiarity with modern frontend tooling and build processes. Ability to work independently, take ownership of delivered solutions, and contribute to system design. Excellent communication skills and experience working in Agile environments ⭐ Nice to have: Experience with Kafka or other event-driven architectures. Knowledge of Hadoop or Apache Spark. Experience with Next.js. Experience with Redux, Zustand, or similar state management solutions. Previous experience in Healthcare or Life Sciences projects. 🌟 What we offer: Long-term cooperation on an international project. Flexible working hours. Opportunity to influence architecture and technical decisions. Modern technology stack. Supportive, collaborative engineering culture. Learning and development opportunities. Modern equipment and comfortable working environment.

🏢 Summary: Full Stack Developer role focused on building scalable Java and React applications, including backend microservices, responsive interfaces, REST integrations, and AWS-based operations. The offer includes long-term international project work, flexible hours, influence on architecture, and development opportunities. 🗂️ Requirements: 4–5+ years of professional software development experience, Commercial Java experience, Spring Framework and Spring Boot experience, React.js and TypeScript experience, JavaScript ES6+ knowledge, Production AWS experience, Microservices architecture knowledge, SQL and relational database experience, REST API integration experience, HTML5, CSS3/SCSS, responsive design, and cross-browser compatibility knowledge, Jest and React Testing Library experience, Modern frontend tooling and build process familiarity 📃 Skills: Java, React, Spring, SpringBoot, SQL, AWS, TypeScript, JavaScript, HTML5, CSS3, SCSS, Jest, Microservices, REST, ReactTestingLibrary 🏢 Description: ✅ Your responsibilities: Design, develop, and maintain scalable full stack applications using Java and React. Build and maintain backend services with Java, Spring Framework, Spring Boot, SQL, and AWS. Develop modern, reusable, and responsive user interfaces using React, TypeScript, and JavaScript. Design and implement scalable frontend architecture and reusable UI components. Collaborate closely with Product Owners, QA Engineers, and other development teams. Integrate frontend applications with REST APIs and backend microservices. Contribute to architectural decisions and technical discussions. Ensure application performance, scalability, security, and maintainability. Participate in code reviews, sprint planning, and Agile ceremonies. Support deployment automation, production operations, and troubleshooting. Mentor less experienced developers and promote engineering best practices. 🧠 Our requirements: Minimum 4–5 years of professional software development experience. Commercial experience with Java, Spring Framework, and Spring Boot. Commercial experience with React.js and TypeScript. Solid understanding of JavaScript (ES6+). Experience working with AWS in production environments. Understanding of microservices architecture. Hands-on experience with SQL and relational databases. Experience integrating and consuming REST APIs. Very good knowledge of HTML5, CSS3 / SCSS, responsive design, and cross-browser compatibility. Experience with frontend testing using Jest and React Testing Library. Familiarity with modern frontend tooling and build processes. Ability to work independently, take ownership of delivered solutions, and contribute to system design. Excellent communication skills and experience working in Agile environments ⭐ Nice to have: Experience with Kafka or other event-driven architectures. Knowledge of Hadoop or Apache Spark. Experience with Next.js. Experience with Redux, Zustand, or similar state management solutions. Previous experience in Healthcare or Life Sciences projects. 🌟 What we offer: Long-term cooperation on an international project. Flexible working hours. Opportunity to influence architecture and technical decisions. Modern technology stack. Supportive, collaborative engineering culture. Learning and development opportunities. Modern equipment and comfortable working environment.

🏢 Summary: Remote B2B frontend engineering role building a platform for European venture capital firms. The position centers on developing scalable React and Next.js applications, with optional backend contributions in C# and .NET. 🗂️ Requirements: 5+ years of professional software development experience, Commercial experience with React and Next.js, Very good JavaScript and TypeScript knowledge, Experience building responsive, maintainable web applications, Experience integrating frontend applications with REST APIs, Understanding of frontend architecture, performance, and development best practices, Excellent English skills 📃 Skills: React, Next.js, JavaScript, TypeScript, REST, APIs 🏢 Description: Does building awesome, innovative products that add up to something meaningful sound like a dream come true? Come join us and make that vision a reality! About You will be fully integrated into our client’s remote engineering team , working on a cutting-edge platform tailored specifically for venture capital firms across Europe . The role is primarily focused on frontend development , with the opportunity to contribute to backend development in .NET depending on your experience and interests. Responsibilities Design, develop, and maintain modern, scalable frontend applications using React and Next.js Build reusable, high-quality UI components and deliver intuitive user experiences Translate business and product requirements into reliable technical solutions Collaborate closely with backend developers, product stakeholders, and other members of the engineering team Integrate frontend applications with APIs and backend services Contribute to application architecture, code quality, performance, and maintainability Participate in code reviews and technical discussions Optionally contribute to backend development using C# and .NET Our offer Competitive salary on a B2B contract Fully remote position Real impact and independence at work Individual career path Work-life balance A non-corporate atmosphere where innovation, personal growth, and teamwork thrive Collaboration with 100+ smart, curious & ambitious engineers What you bring 5+ years of professional software development experience Strong commercial experience with React and Next.js Very good knowledge of JavaScript / TypeScript Experience building modern, responsive, and maintainable web applications Experience integrating frontend applications with REST APIs Good understanding of frontend architecture, performance, and software development best practices Excellent English language skills Nice to have: Experience with C# and .NET / .NET Core Experience with MS SQL Understanding of microservices architecture Experience working on B2C or complex web applications Interest in financial markets or venture capital

🏢 Summary: Opportunity to design and build secure application services and APIs, lead technical design, and resolve complex production issues. The role emphasizes reliability engineering, independent ownership, and cross-team collaboration using Python, web frameworks, cloud infrastructure, and DevOps tooling. 🗂️ Requirements: Strong Python and object-oriented programming skills, Hands-on Django or FastAPI experience, Hands-on TypeScript framework experience, RESTful API design expertise, CI/CD and DevOps tooling experience, GCP, Kubernetes, Terraform, and Helm experience, Relational database experience, Spoken English proficiency 📃 Skills: Python, Django, FastAPI, TypeScript, Angular, NestJS, REST, Jenkins, GitHub, GitLab, GCP, Kubernetes, Terraform, Helm, PostgreSQL 🏢 Description: 10+ Years of Experience is required Roles and RESPONSIBILITIES Design and build secure application services and APIs. Drive technical design discussions and translate requirements into robust solutions. Troubleshoot complex production issues and lead root-cause analysis. Improve service reliability and resilience through proactive engineering practices. Work independently with strong ownership while collaborating across teams. SKILLS & EXPERIENCE REQUIRED Strong Python skills (Python 3.11+ preferred) and solid object-oriented programming fundamentals. Hands-on experience with Django/FastAPI and TypeScript frameworks (Angular/NestJS). Excellent spoken English communication skills for day-to-day collaboration with teammates. Strong understanding of RESTful API design best practices. Familiarity with CI/CD and DevOps tooling (Jenkins, GitHub Actions, GitLab CI). Experience with GCP, Kubernetes, Terraform, and Helm. Experience with relational databases, preferably PostgreSQL. PUBLIC Strong analytical mindset, learning agility, and a problem-solving approach. Nice to have: Basic understanding of open-source software licenses (e.g., Apache-2.0, MIT, GPL) and their practical implications in software delivery. Familiarity with modern Python tooling (uv, Ruff, Rye) and Git workflows. Familiarity with Go and Java. Familiarity with identity protocols and standards: SAML, OAuth2, OpenID Connect. Proficiency with AI-assisted engineering tools such as Claude Code and Codex. Familiarity with OpenTelemetry and OpenAPI. Visible technical engagement (blogging, GitHub portfolio, open-source contributions).

🏢 Summary: Senior frontend/full-stack developer role focused on building resilient, enterprise-ready product features for a sports and health platform. The position involves React, TypeScript, Next.js, REST APIs, PostgreSQL, and close remote collaboration, with a hybrid schedule in Kraków. 🗂️ Requirements: 5+ years of professional development experience, Production experience with React and TypeScript, Production experience with Next.js App Router, REST API and data-validation experience, PostgreSQL and ORM experience, Ability to follow architectural documentation and team conventions, Git, code review, and Jira experience, Independent problem analysis and written feature planning/ADRs, Careful handling of healthcare data, schemas, and access logic, Strong written technical communication, Remote and asynchronous collaboration skills, Advanced English, Ability to complete a technical coding test without assistance, Availability to start within one month, Ability to work from the Kraków office 3 days per week 📃 Skills: React, TypeScript, Next.js, REST, Zod, PostgreSQL, Drizzle, Prisma, TypeORM, Git, Jira, Claude 🏢 Description: About the role You will be assisting in the understanding of, architecture, implementation, and quality of core Product Roadmap items intended to drive the project for our client forward. The ability to work with the team and collaborate is essential. You will have an immediate impact and be an early figure in the company today to help drive our growth. You will focus on solidifying our product and making it resilient as well as learning how to roll out enterprise-ready features. Required skills /knowledge and production experience/ React + TypeScript Next.js (App Router) — routing, server/client components, API routes REST API, data validation (example - Zod) PostgreSQL and ORM (Drizzle or similar — Prisma/TypeORM) Work according to the team's conventions and architectural documentation(ADR-y) — the ability to read and follow established standards before writing code Git, code review, ticketing (Jira) Coding with Claude /on daily basis/ Minimum of 5 years of professional experience developer with hands-on skills. Communication and other required skills Git, code review, ticketing (Jira) Independence in problem analysis and a willingness to plan before implementation (the project requires a written plan/ADR before each new feature). Accuracy and attention to detail—working with healthcare data requires caution when changing the schema and access logic. Good written communication—documentation, PR descriptions, tickets, and code review comments. Comfortable working in a distributed/remote team and asynchronous communication. Openness to feedback and a willingness to propose simpler solutions instead of over-engineering (the project explicitly avoids over-engineering). Sense of responsibility (ownership) for the delivered functionalities from design to implementation. Advanced English - hard must - daily calls with native CTO or CEO(weekly) . Ability to discuss technical problems, describe concept, architecture or planned feature. There's going to be (online or onsite in Krakow) technical coding test (without extra help) and English general and/or tech conversation. Awesome but not a must: Supabase (Auth, RLS, Postgres) AWS: S3, SQS, Lambda - designing or integrating with data processing pipelines (multipart upload, task queuing, workers) Terraform / IaC - ability to read infrastructure definitions (no need to write them yourself) Working with video / media data / large-volume files (e.g., recording processing, LiDAR, wearable data) Designing permission systems (RBAC) for multiple user roles OpenAPI / API contracts, documenting endpoints Experience in health, sports, telemedicine, or other sensitive/regulated data Application observability (Sentry, PostHog, or similar) Real-time integrations (chat/video SDKs like CometChat, WebSocket) Our benefits: Awesome and highly intense product /sports and health/ Private medical care and multisport card Flexible working hours (you can start between 8:00 -10:00 a.m.) Your choice of computer: Mac OS/Linux/Windows Upskilling budget English discussion classes every week Parking spot few mins from office Employee recommendation program. 🟢 The office is based in Kraków. We work 3 days from the office a week. 🟢 The process consists of 2 stages. We recruit remotely :) Ideal candidate should start within a month (no longer).