Senior .NET Developer / Tech Lead

About the Role

For our client, we are looking for an experienced Senior .NET Developer / Tech Lead to join a fintech project focused on payment-related backend solutions.

This is a hands-on technical leadership role combining backend software development with architecture input, technical ownership, and mentoring. You will design and build secure, scalable backend services while helping guide engineering decisions and maintain high development standards across the team.

You will work with C#, modern .NET, SQL, REST APIs, integrations, CI/CD, and Docker in a regulated financial-services environment.

The role is fully remote and suitable for candidates based in Lithuania.

Key Responsibilities

• Design, develop, and maintain backend services using C# and modern .NET.
• Contribute to technical design and architectural decisions.
• Build integrations with REST APIs, third-party platforms, messaging systems, and file-based interfaces.
• Develop secure, reliable, and scalable backend solutions.
• Take technical ownership of key services, components, and delivery areas.
• Lead technical discussions and support engineering decision-making.
• Mentor developers and provide guidance on implementation approaches and engineering practices.
• Conduct code reviews and help maintain high code-quality standards.
• Work with SQL and relational databases.
• Contribute to CI/CD workflows and deployment processes.
• Work with Docker-based development and delivery environments.
• Troubleshoot complex application, integration, and production issues.
• Collaborate with product, compliance, QA, and other engineering teams.
• Contribute to technical documentation and knowledge sharing.
• Support continuous improvement of architecture, development practices, and engineering quality.

Essential Requirements

• At least 7 years of hands-on C# / .NET development experience.
• Strong backend development experience.
• Strong experience with REST APIs and system integrations.
• Experience working with distributed systems.
• Strong SQL and relational database experience.
• Experience with Docker.
• Experience with CI/CD practices and tooling.
• Strong understanding of secure and reliable software development.
• Experience working as a Senior Engineer, Tech Lead, or in a similar technical leadership role.
• Ability to take technical ownership and guide other developers.
• Strong problem-solving and debugging skills.
• Good understanding of software architecture and design principles.
• Strong communication and collaboration skills.
• Professional working proficiency in English.

Preferred Requirements

• Experience in payments, banking, fintech, or financial services.
• Experience working in regulated or compliance-driven environments.
• Knowledge of ISO 20022 and/or SEPA.
• Understanding of clearing, settlement, or payment-processing flows.
• Experience with Azure or AWS.
• Experience designing highly available or fault-tolerant backend systems.
• Experience mentoring engineers or leading technical delivery across multiple workstreams.

What We Value

We value engineers who combine strong technical expertise with ownership, sound judgment, and a pragmatic approach to delivery. You should be comfortable making technical decisions, guiding other developers, and balancing architecture quality with practical business needs.

We also value clear communication and collaboration. You should be able to work effectively with engineers, product stakeholders, QA, and compliance teams while maintaining a strong focus on reliability, security, and maintainability.

What You Can Expect

• Hands-on backend engineering using C# and modern .NET.
• Significant technical ownership and influence over architecture and engineering decisions.
• Work on payment-focused solutions in a regulated fintech environment.
• Collaboration with experienced product, compliance, QA, and engineering teams.
• Exposure to integrations, distributed systems, CI/CD, and containerized delivery.
• A fully remote working model.
• A 12-month engagement with meaningful long-term technical responsibility.

What We Offer

• Project / Industry: Fintech / payments.
• Location: Lithuania.
• Contract Type: B2B contractor.
• Compensation: €40–45/hour.
• Start Date: ASAP.
• Work Model: Remote.
• Contract Duration: 12 months.

Recruitment Process

• CV Screening: Applications are reviewed within 24 hours.
• Pre-Screening Interview: A brief Q&A session, automated or with a recruiter, designed to learn more about your experience related to the position.
  1. Automated Session (Recommended) – You can complete the session independently at a convenient time. The structured questions and follow-ups are designed to capture detailed, role-relevant experience and can support faster hiring-manager feedback.
  2. Session with a Recruiter – You can complete the same pre-screening with a recruiter. The discussion may be less detailed and feedback may take slightly longer.
• Shortlisting: Qualified candidates are presented to the hiring manager for review.
• Formal Interviews: Discussions with the hiring manager or project team, with feedback typically provided within 1–2 weeks.
• Offer and Onboarding: Successful candidates receive a formal offer and begin the onboarding process.

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