Senior .NET Developer / Tech Lead

Project/Client:Fintech Location:Lithuania Start Date:ASAP Duration:12 months Language:English Role Overview: We’re looking for aSenior .NET Developer / Tech Leadto join our engineering team and build payment-focused backend solutions in a regulated fintech environment. This is a hands-on role combining software development with technical leadership. You’ll design and develop backend services, contribute to technical and architectural decisions, and help the team maintain high engineering standards. Key Responsibilities: - Design and develop backend services usingC# / modern .NET - Contribute totechnical designandarchitectural decisions - Build integrations withREST APIs, third-party platforms, messaging, and file-based interfaces - Ensure code quality throughcode reviewsand engineering best practices - Mentor developers and leadtechnical discussions - Work withSQL, relational databases,CI/CD, andDocker - Buildsecure, reliable, and scalablesoftware solutions - Collaborate with product, compliance, QA, and other engineering teams Must-Have Requirements: - 7+ yearsof hands-onC# / .NETexperience - Strongbackend developmentexperience - Experience withREST APIs, integrations, anddistributed systems - StrongSQLand relational database experience - Experience withDockerandCI/CD - Understanding ofsecure and reliable software development - Experience as aSenior Engineer,Tech Lead, or similar - Ability to taketechnical ownershipand guide other developers Nice to Have: - Experience inpayments,banking,fintech, orfinancial services - Experience in aregulated / compliance-driven environment - Knowledge ofISO 20022 / SEPA - Understanding ofclearing,settlement, orpayment processing - Experience withAzureorAWS - What we offer - Model: B2B contract with Bonapolia - one contract, one monthly invoice - Rate: negotiated per candidate seniority and client budget - Payment: monthly invoice, paid on the same schedule the client pays us (usually 30 days) - Contract written under your country's law - We handle the client-side paperwork: MSA, NDA, invoicing 🏢 About Bonapolia Bonapolia is a family-owned IT staff augmentation team based in Lisbon. We build engineering teams for product companies and IT consultancies across Europe and the US. More at 📩 Ready to Join? We look forward to receiving your application and welcoming you to our team! Originally posted on Himalayas