April 25, 2026
Full Stack Python Developer
Senior • Remote
Warsaw, Poland
Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together!
We are looking for a Fullstack Python Developer for our client — a company operating at the intersection of software engineering and scientific innovation.
What you will do:
Develop scalable frontend (TypeScript, React) and backend (Python, Django, Celery) applications.
Build and maintain REST and GraphQL APIs.
Solve complex engineering challenges related to scientific data and analysis workflows.
Collaborate with local and off‑shore teams in an agile, iterative environment.
Work with Postgres, MongoDB, and AWS cloud services.
Ensure high code quality through testing (pytest, optionally Playwright)
What we are looking for:
5+ years of experience in data‑focused software development within agile teams.
Strong skills in TypeScript/React and Python (Django, Celery).
Hands‑on experience with REST and GraphQL API development.
Proficiency with GitHub and relational/NoSQL databases (Postgres, MongoDB).
Experience working with AWS and modern cloud tooling.
Degree in bioinformatics, computer science, or a related field; biological knowledge is a plus.
Perks and benefits:
Comprehensive benefits - enjoy Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers.
Flexibility - adaptable working hours and remote/hybrid work options to suit your lifestyle & location.
Career growth - access opportunities for professional development and learning, including perks related to our official partnerships with global IT giants: Microsoft, AWS, Snowflake, Salesforce & more.
Global collaboration - work with a diverse, international team.
Innovative environment - be part of a forward-thinking and growth-oriented workplace.
Engaging community – Work with passionate professionals and participate in team-building events, hackathons, and CSR initiatives to make an impact beyond work.
Team-building events including our company tradition (annual company event in Mazury).
A pleasant surprise to start your journey with us in the form of a welcome pack.
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Remote
Lublin, LU, Poland
🏢 Summary: Offer for an experienced .NET Developer to design and develop applications and databases within public sector IT projects, working in a SCRUM environment with strong focus on code quality and collaboration. The role involves backend development, integration services, testing, and technical documentation. The position also requires security clearance and readiness for extended verification procedures. 🗂️ Requirements: Minimum 3 years of experience in .NET development, Very good knowledge of C#, Experience with at least one backend framework: ASP.NET MVC, WPF, SignalR, WCF, ASP.NET Core, or Web API, Knowledge of object-oriented design principles and best practices (SOLID, DRY, Clean Code), Experience with TDD, Proficiency with Visual Studio, Experience with Entity Framework or other ORM, Experience with relational SQL or NoSQL databases, Experience in building REST, SOAP, or SignalR services, Basic knowledge of React, Angular, or Vue, Experience with CI/CD tools, static code analysis, test coverage tools, xUnit or NUnit, and Git, Security clearance for access to classified information ("confidential"), Readiness to undergo extended clearance procedure for higher-level classified information 📃 Skills: .NET, C#, ASP.NET, MVC, WPF, SignalR, WCF, ASP.NET Core, Web API, SOLID, DRY, Clean Code, TDD, Visual Studio, Entity Framework, ORM, SQL, SQL Server, PostgreSQL, NoSQL, REST, SOAP, React, Angular, Vue, CI/CD, xUnit, NUnit, Git, SCRUM 🏢 Description: Billennium to globalna firma technologiczna z ponad 20-letnim doświadczeniem, zaangażowana w innowacje i wspieranie przedsiębiorstw. Jako pracodawca oferujemy wspierające, nastawione na rozwój środowisko, w którym współpraca i kreatywność to naczelne wartości. Dołącz do nas, aby wspólnie kształtować przyszłość technologii! Kogo szukamy? Do naszego zespołu poszukujemy doświadczonej osoby na stanowisko .NET Developera, która wesprze nas w realizacji projektów IT — w obszarze public. Zakres zadań: Projektowanie oraz rozwijanie aplikacji i baz danych w ramach realizowanych projektów. Przygotowywanie estymacji prac, wskazywanie potencjalnych trudności i możliwych zagrożeń realizacyjnych. Opracowywanie planów testów oraz ich wykonywanie w celu zapewnienia poprawności działania tworzonych rozwiązań. Dbanie o utrzymanie wysokiej jakości kodu, w tym udział w przeglądach i weryfikacji pracy innych programistów. Udzielanie wsparcia technicznego oraz dzielenie się wiedzą z członkami zespołu. Bieżąca współpraca z analitykami biznesowymi, architektami, projektantami UX i testerami przy tworzeniu nowych funkcjonalności. Przygotowywanie dokumentacji technicznej dla tworzonych komponentów i usług. Realizacja zadań zgodnie z obowiązującymi standardami technicznymi i metodyką pracy SCRUM. Niezbędne umiejętności i kwalifikacje: Minimum 3 lat doświadczenia w programowaniu w środowisku .NET Bardzo dobra znajomość języka C#. Praktyczne doświadczenie w pracy z co najmniej jedną technologią lub frameworkiem backendowym: ASP.NET MVC, WPF, SignalR, WCF, ASP.NET Core, Web API. Bardzo dobra znajomość zasad projektowania obiektowego oraz stosowanie dobrych praktyk (SOLID, DRY, Clean Code), oraz doświadczenie w stosowaniu TDD. Swoboda w pracy z środowiskiem Visual Studio Doświadczenie w korzystaniu z Entity Framework lub innego ORM. Praktyka w tworzeniu aplikacji korzystających z relacyjnych baz SQL (np. SQL Server, PostgreSQL) lub baz NoSQL. Doświadczenie w tworzeniu usług opartych o REST, SOAP lub SignalR. Podstawowa znajomość jednego z frameworków front-end: React, Angular, Vue. Doświadczenie w korzystaniu z narzędzi wspierających proces wytwarzania oprogramowania (CI/CD, statyczna analiza kodu, pokrycie testów, xUnit/NUnit oraz Git). Poświadczenie bezpieczeństwa dostępu do informacji niejawnych o klauzuli poufne; Gotowość na przeprowadzenie rozszerzonego postępowania sprawdzającego w zakresie dostępu do informacji niejawnych o klauzuli tajne i ściśle tajne; Nasza oferta: Pakiet benefitów pozapłacowych — Udemy for Business, prywatna opieka medyczna, karta Multisport, pakiet weterynaryjny, lekcje językowe, bony zakupowe Elastyczność — elastyczne godziny pracy i opcje pracy zdalnej/hybrydowej dostosowane do Twojego stylu życia i lokalizacji Rozwój kariery — dostęp do szkoleń i certyfikacji, współpraca z globalnymi partnerami IT (Microsoft, AWS, Snowflake, Salesforce) Angażująca społeczność — udział w wydarzeniach team buildingowych, hackathonach i inicjatywach CSR Firmowe tradycje — coroczne wydarzenie integracyjne na Mazurach Czekamy właśnie na Ciebie!
Technology
Billennium
Senior .Net Developer
Senior
Remote
Warsaw, MZ, Poland
🏢 Summary: The offer is for a Senior .NET Developer responsible for designing and developing applications and databases in public sector projects. The role includes building high-quality, scalable solutions, performing code reviews, creating tests, and collaborating in a Scrum team. The position also involves working with modern cloud, containerization, and CI/CD technologies. 🗂️ Requirements: Minimum 5 years of experience in .NET development within the last 10 years, Very good knowledge of C#, Experience with at least one: ASP.NET MVC, WPF, SignalR, WCF, Web API, Knowledge of OOP principles including SOLID and DRY, Experience with TDD or agile development practices, Experience with Visual Studio, Experience with Entity Framework or other ORM, Experience with SQL or NoSQL databases, Experience building SOAP, REST or SignalR services, Practical knowledge of IIS server, Experience with at least one frontend framework: Vue.js, Angular or React, Ability to program in HTML, JavaScript and CSS, Experience with Docker, Kubernetes or similar, Knowledge of Microsoft Azure, Experience with CI/CD tools, static code analysis and unit testing tools, Experience with Git version control system, Polish language proficiency at minimum C1 level 📃 Skills: .NET, C#, ASP.NET, MVC, WPF, SignalR, WCF, WebAPI, SOLID, DRY, TDD, VisualStudio, EntityFramework, SQL, NoSQL, SOAP, REST, IIS, Vue, Angular, React, HTML, JavaScript, CSS, Docker, Kubernetes, Azure, CI/CD, xUnit, Git, SCRUM 🏢 Description: Billennium to globalna firma technologiczna z ponad 20-letnim doświadczeniem, zaangażowana w innowacje i wspieranie przedsiębiorstw. Jako pracodawca oferujemy wspierające, nastawione na rozwój środowisko, w którym współpraca i kreatywność to naczelne wartości. Dołącz do nas, aby wspólnie kształtować przyszłość technologii! Kogo szukamy? Do naszego zespołu poszukujemy doświadczonej osoby na stanowisko: Senior .Net Developer, która wesprze nas w realizacji projektów IT — w obszarze public. Zakres zadań: Projektowanie i tworzenie aplikacji/baz danych Szacowanie czasochłonności zadań oraz wskazania ryzyka lub problemów przy ich realizacji Planowanie, tworzenie i wykonywanie testów aplikacji i rozwiązań Dbanie o jakość kodu źródłowego przeprowadzanie Code Review Wsparcie merytoryczne i techniczne innych członków zespołu Ścisła współpraca z zespołami analityków biznesowych, architektów, UX designerów oraz testerów Tworzenie dokumentacji technicznej Realizowanie zadań zgodnie z obowiązującymi zasadami i przyjętą metodyką pracy (SCRUM) Niezbędne umiejętności i kwalifikacje: Minimum 5 lat doświadczenia w programowaniu w technologiach .NET, zdobyte w ciągu ostatnich 10 lat. Bardzo dobra znajomość języka C#. Doświadczenie w pracy z co najmniej jedną technologią: ASP.NET MVC, WPF, SignalR, WCF lub Web API. Znajomość zasad projektowania obiektowego, w tym SOLID, DRY, oraz doświadczenie w stosowaniu TDD lub innych technik zwinnego wytwarzania oprogramowania. Doświadczenie w pracy z środowiskiem Visual Studio. Znajomość Entity Framework lub innej biblioteki ORM. Doświadczenie w tworzeniu aplikacji wykorzystujących relacyjne bazy danych SQL lub bazy NoSQL. Doświadczenie w budowaniu usług opartych o SOAP, REST lub SignalR. Praktyczna znajomość serwera klasy enterprise IIS. Praktyczna znajomość co najmniej jednego frameworka front-end: Vue.js, Angular lub React. Umiejętność programowania w HTML, JavaScript i CSS. Doświadczenie w pracy z konteneryzacją, taką jak Docker, Kubernetes lub technologie równoważne. Znajomość środowiska Microsoft Azure. Umiejętność korzystania z narzędzi wspierających proces wytwarzania oprogramowania, takich jak narzędzia CI/CD, statyczna analiza kodu, narzędzia do weryfikacji pokrycia testami jednostkowymi (np. xUnit) oraz system kontroli wersji GIT. Znajomość języka polskiego na poziomie umożliwiającym swobodną komunikację werbalną i pisemną. (min. C1) Nasza oferta: Pakiet benefitów pozapłacowych — Udemy for Business, prywatna opieka medyczna, karta Multisport, pakiet weterynaryjny, lekcje językowe, bony zakupowe Elastyczność — elastyczne godziny pracy i opcje pracy zdalnej/hybrydowej dostosowane do Twojego stylu życia i lokalizacji Rozwój kariery — dostęp do szkoleń i certyfikacji, współpraca z globalnymi partnerami IT (Microsoft, AWS, Snowflake, Salesforce) Angażująca społeczność — udział w wydarzeniach team buildingowych, hackathonach i inicjatywach CSR Firmowe tradycje — coroczne wydarzenie integracyjne na Mazurach Czekamy właśnie na Ciebie!
Technology
Billennium
Organizational Change Manager
Senior
Remote
Warsaw, Poland
🏢 Summary: The offer is for a Change Management Consultant responsible for driving adoption of new tools and processes by translating complex technical initiatives into clear, business-focused communication. The role involves stakeholder analysis, engagement campaigns, training enablement, and tracking adoption metrics. The consultant collaborates cross-functionally to ensure successful implementation of technology-driven changes. 🗂️ Requirements: Experience with change-management frameworks, Ability to translate technical concepts into business language, Experience collaborating with program and product teams, Strong stakeholder analysis skills, Ability to create training materials and workshops, Experience defining KPIs and tracking adoption metrics, Ability to quickly learn new software and technologies 📃 Skills: ChangeManagement, StakeholderAnalysis, KPI, Communication, Training, Workshops, Teams, Slack, Architecture, AdoptionMetrics 🏢 Description: Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together! We are seeking a Change Management Consultant who will partner with Program and Product Managers, Communications teams, and other stakeholders to drive the adoption of new tools and processes. What you will do Tell the Story: Turn technical work into clear, compelling success stories. Translate Tech: Break down complex architecture into simple benefit‑focused content. Build Awareness: Create internal campaigns that promote programs and deliverables. Analyze Stakeholders: Identify how changes impact each user group. Drive Engagement: Use varied channels (Teams/Slack, AMAs, demos) to communicate. Enable Training: Produce cheat sheets, videos, and run workshops. Grow Change Network: Develop a Super User community for support and feedback. Track Adoption: Define KPIs and monitor where users struggle What we are looking for Solid experience with change‑management frameworks and the flexibility to adapt them creatively to needs. Technical-to-Business Translation: Ability to understand complex technical topics and communicate them clearly to executives and non‑technical audiences. Cross‑Functional Collaboration: Proven experience working with program, product, project, and communications teams. Exceptional Communication & Empathy: Strong storytelling, conflict‑resolution skills, and the ability to connect with stakeholders at all levels. Fast Learning & Tech Adoption: Ability to quickly grasp new software and processes and explain their value to others. Perks and benefits (our offer) Comprehensive benefits - enjoy Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers. Flexibility - adaptable working hours and remote/hybrid work options to suit your lifestyle & location. Career growth - access opportunities for professional development and learning, including perks related to our official partnerships with global IT giants: Microsoft, AWS, Snowflake, Salesforce & more. Global collaboration - work with a diverse, international team. Innovative environment - be part of a forward-thinking and growth-oriented workplace. Engaging community – Work with passionate professionals and participate in team-building events, hackathons, and CSR initiatives to make an impact beyond work. Team-building events including our company tradition (annual company event in Mazury). A pleasant surprise to start your journey with us in the form of a welcome pack. Recruitment process: HR call Technical Interview Interview with the dedicated Client Final decision/ Feedback Sounds interesting? Click "Apply" and have a chance to hear more!