Senior Software Engineer - C# / .NET

About the role

About us:

Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients. Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability.

The Role:

We’re seeking a hands-on Senior Software Engineer to drive application modernization, legacy-codebase stabilization, service/API extraction, and secure integration initiatives. The role combines deep expertise in C#/.NET, Angular, and SQL Server with modern integration engineering using TypeScript; Node.js, gRPC/Protocol Buffers, PostgreSQL, and Microsoft Azure. You will lead integration development and guide architecture decisions, code reviews, and the reliability, security, and maintainability of existing systems. Experience: 6+ Years

Responsibilities

- Hands on experience with the design, development, modernization, and maintenance of enterprise applications using C#/.NET and Angular.

- Stabilize legacy codebases by addressing technical debt, reliability, performance, and maintainability.

- Design and implement service/API extraction strategies to decouple legacy applications into well-defined, maintainable services.

- Design secure integrations between existing platforms and external systems, covering authentication, authorization, data protection, and error handling.

- Develop and optimize SQL Server queries, stored procedures, and application data-access layers.

- Lead integration development using TypeScript & Node.js and modern API architectures.

- Design and implement service-to-service communication using gRPC and Protocol Buffers.

- Build and maintain PostgreSQL-backed integrations.

- Build, deploy, and support integration components on Microsoft Azure.

- Define API contracts, integration patterns, error-handling approaches, observability, and security standards.

- Troubleshoot complex application, cross-service, and data consistency issues and drive root-cause analysis to resolution.

- Lead architecture discussions, technical design reviews, and code reviews; establish coding standards, testing practices, and reusable development patterns.

- Collaborate with product owners, architects, and engineering teams to turn business requirements into scalable technical solutions.

- Mentor engineers and support delivery planning and estimation.

Requirements (all mandatory)

- Minimum 6 years of experience in software development.

Strong hands-on experience with C#, .NET Framework, and modern .NET.