Fullstack Developer

We are looking for a Fullstack Developer for our client! RESPONSIBILITIESBuild modern user experiences using Vue 3, component libraries, and modern frontend toolingDesign and develop backend services and APIs using .NET Core / ASP.NETOwn features end-to-end, from UI through API and databaseContribute to the modernisation of legacy Classic ASP systems, improving stability while helping migrate functionality to newer servicesCollaborate on system design, balancing scalability, security, maintainability, and pragmatismWrite clean, testable code, participate in code reviews, and help raise engineering standardsIntegrate third-party services and APIsWork with CI/CD pipelines and deployment tooling to deliver changes safely and efficientlyCollaborate closely with product, design, and QA to deliver high-quality outcomes.REQUIREMENTSExperience as a full-stack developer working across backend and frontend systemsExperience with .NET (C#) and ASP.NET CoreExperience with Vue 3, including its ecosystem (Vue Router, Pinia/Vuex)Proficiency with JavaScript / TypeScript, HTML5, and CSS3Experience designing and consuming RESTful APIsExperience working with relational databases (e.g. MySQL or SQL Server) and writing efficient queriesFamiliarity with Git and collaborative development workflowsExperience working with or supporting legacy systems (such as Classic ASP), or a willingness to do so as part of a broader modernisation effortA problem-solving mindset and a collaborative, pragmatic approach to engineering.NICE TO HAVEWHAT DO WE OFFER ON THIS PROJECT?Cooperation based on a B2B contract and rate: 11 000-15 000 zł nett+VAT/B2B + 20 days of paid leave100% remote work The support of a dedicated mentor. In the relationship, we focus on direct communication. When you join speedapp, you will be put in touch with a dedicated mentor who will make sure that you enjoy working with us and with the clientEvents and integration meetings, as well as participation in various initiatives, e.g., sportsAccess to the benefits offering (medical care, life insurance, Multisport card).WHAT DOES THE RECRUITMENT PROCESS LOOK LIKE?Application: Apply and submit your CV.After the application review, the recruiter will contact selected candidates by phone.Screening: Have a conversation with a speedapp recruiter about your experience.Next steps: The speedapp recruiter will explain the recruitment process for the specific position.The speedapp recruiter will stay in touch with you throughout the entire process.ABOUT SPEEDAPPAt speedapp, we believe that an organization is only as good as the people who make it up. We are a team of IT experts and other professionals working for our clients around the world (including Israel, Austria, USA). We go far beyond the HR category. We build IT teams and also help manage them.👉 10 years of experience👉 +100 clients worldwide +300 hires per year💎 We have won the prestigious 'Forbes Diamonds' award four times (2022, 2023, 2024, 2025). We are a member of the European Fast Growth Icons network and FinTech Poland. We are ranked 18th among the 100 fastest growing companies 2023 by Clutch.DO YOU HAVE ANY QUESTIONS?Contact the recruiter responsible for this process directly.Karolina KizowskaSenior IT Delivery [email protected]