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Freelance Senior .NET Developer / Tech Lead

WISE INTEGRATION Lithuania

Developer Senior Manager Contractor

Project/Client: Fintech

Location: Lithuania

**Start Date:**ASAP

Duration: 12 months

**Language:**English

Role Overview:

We’re looking for a Senior .NET Developer / Tech Lead to 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 using C# / modern .NET
  • Contribute to technical design and architectural decisions
  • Build integrations with REST APIs, third-party platforms, messaging, and file-based interfaces
  • Ensure code quality through code reviews and engineering best practices
  • Mentor developers and lead technical discussions
  • Work with SQL, relational databases, CI/CD, and Docker
  • Build secure, reliable, and scalable software solutions
  • Collaborate with product, compliance, QA, and other engineering teams

Must-Have Requirements:

  • 7+ years of hands-on C# / .NET experience
  • Strong backend development experience
  • Experience with REST APIs, integrations, and distributed systems
  • Strong SQL and relational database experience
  • Experience with Docker and CI/CD
  • Understanding of secure and reliable software development
  • Experience as a Senior Engineer, Tech Lead, or similar
  • Ability to take technical ownership and guide other developers

Nice to Have:

  • Experience in payments, banking, fintech, or financial services
  • Experience in a regulated / compliance-driven environment
  • Knowledge of ISO 20022 / SEPA
  • Understanding of clearing, settlement, or payment processing
  • Experience with Azure or AWS

Originally posted on Himalayas

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Where this listing came from

  1. 29 Oct 2026 Himalayas first sighting

Seen on 1 board over 0 days.