Senior Back End Developer (C#)

Primary Responsibilities:

• Lead design and delivery of complex features, from ideation to production.
• Proactively identify problems and drive technical decisions with minimal oversight.
• Use AI-assisted tools to accelerate delivery, critically validating output for correctness and security.
• Produce clear documentation for API consumers.
• Drive automated test coverage for your components.
• Own and evolve code within your product area, including microservices architecture.
• Modernize legacy functionality and improve the maintainability of existing solutions.
• Follow engineering best practices around code review, version control, CI/CD, and secure development.
• Investigate issues, analyze logs and telemetry, and deliver safe, reliable fixes.
• Share knowledge and help improve team development practices.

Requirements:

• 5+ years building web apps/backend APIs in C#.
• Proven experience making architectural decisions and owning technical trade-offs.
• Strong OOD principles, classic design patterns (GoF).
• Experience with microservices architecture, as well as working with and modernizing legacy systems.
• Strong data modeling / MS SQL / data access optimization.
• Experience with API design, implementation, and troubleshooting.
• Unit & integration testing (NUnit/xUnit, FluentAssertions, Moq).
• Comfortable owning code from commit to production, with strong CI/CD and Git-based workflow experience.
• Understanding of web security fundamentals and secure coding practices.
• Comfortable using AI tools as a core part of daily engineering work — applied to production-quality code, not just casual experimentation.
• Experience integrating LLM/AI features into products (agents, RAG, MCP-based tooling), building internal AI-driven developer-productivity tooling would be a plus. 
• Good communication skills and Intermediate+ English.

What We're Looking For (Beyond Tech Skills):

Communication & Clarity — Explains problems, trade-offs, and solutions clearly to both technical and non-technical stakeholders.
Ownership & Accountability — Takes accountability for outcomes, proactively flags risks, and stays engaged beyond assigned tasks.
Growth Mindset & Leadership — Eager to learn, goal-oriented, with experience leading a team, project, or initiative.

Our benefits:

Flexible working hours
Experienced development teams
Long-term employment
Competitive salary 
Paid vacation and days off on national holidays
Paid sick leave and internal medical insurance policy
Mental health coverage
Compensation for training and additional education
Community of practice, regular knowledge sharing among colleagues
Provision of computer equipment is needed 
Internet compensation (50$ per month)
And other benefits, described in detail in the Staff Handbook