Senior .NET Developer / Tech Lead

Bonapolia · Estonia, Latvia, Lithuania · posted today ago

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About this role

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!