Senior Software Engineer - C# / .NET
Confirmed on the employer's own hiring board on Oct 25, 2026. First seen by Alion on Oct 23, 2026.
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.
- Experience building and maintaining enterprise web applications using Angular.
- Strong SQL Server skills, including stored procedures, query optimization, and database troubleshooting.
- Proven experience stabilizing, refactoring, and improving existing enterprise applications.
- Experience extracting services from monolithic or legacy systems and designing maintainable APIs.
- Solid understanding of secure service communication, authentication, authorization, and data protection.
- Strong hands-on development experience with both TypeScript and Node.js.
- Expertise in API design: RESTful APIs, service contracts, integration patterns, and versioning.
- Practical experience designing or implementing gRPC services and Protobuf contracts.
- Experience with PostgreSQL, including schema design, SQL, query optimization, and application integration.
- Experience deploying, integrating, and supporting application services on Microsoft Azure.
- Strong grasp of design patterns, clean code, testing, debugging, and version control (Git).
- Ability to lead design discussions, run architecture and code reviews, and mentor engineers.
Other Employment Benefits
- Family health insurance cover.
- Education / Certification reimbursement.
- Multiple leave types
- Flexible work schedule.
- Work from home policies.
Tech Holding is proud to be an Equal Opportunity Employer and is committed to fostering a diverse and inclusive workplace. We welcome applicants from all backgrounds and experiences, and we consider qualified applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, disability, veteran status, or any other legally protected characteristic. If you require accommodation in the application process, please contact our HR