Senior C# Backend Engineer — FinTech Platform, AI Tools

Access Softek; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Flexible working hours

Competitive salary

Paid vacation and holidays

Medical insurance policy

Mental health coverage

Training compensation

Job summary

Access Softek in the United States is seeking a Senior Back End Developer (C#) to join the Banking Platform Team. You will shape core services behind our online banking platform, work across a distributed team, and lead the monolith-to-microservices migration with a focus on high-scale backend systems.

You will work with C# .NET Core, .NET Framework 4.8, MS SQL Server, RabbitMQ and REST, collaborating with PMs, QA, and frontend developers.

Qualifications

• 5+ years building web apps / backend APIs in C#
• Proven architectural decision-maker with trade-off ownership
• Strong OOD principles and GoF patterns
• Experience with microservices and modernizing legacy systems
• Strong data modeling and MS SQL / data access optimization
• Experience designing and troubleshooting APIs; NUnit/xUnit, FluentAssertions, Moq
• CI/CD and Git-based workflows
• Secure coding practices and web security fundamentals
• Experience integrating AI features (LLMs, RAG, tooling) is a plus
• Good communication and Intermediate+ English

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 while validating output for correctness and security
• Produce clear API consumer documentation
• Drive automated test coverage for components
• Own and evolve code within the product area including microservices
• Modernize legacy functionality and improve maintainability
• Follow best practices around code review, version control, CI/CD and secure development
• Investigate issues, analyze logs and telemetry, deliver safe fixes
• Share knowledge and help improve team practices

Skills

C# / .NET Core

REST APIs

Microservices

MS SQL Server

Unit / Integration testing

CI / CD

Git workflow

Security fundamentals

AI-assisted development

English communication

Tools

RabbitMQ

MS SQL Server

Git

Job description

Access Softek in the United States is seeking a Senior Back End Developer (C#) to join the Banking Platform Team. You will shape core services behind our online banking platform, work across a distributed team, and lead the monolith-to-microservices migration with a focus on high-scale backend systems.

You will work with C# .NET Core, .NET Framework 4.8, MS SQL Server, RabbitMQ and REST, collaborating with PMs, QA, and frontend developers.