Sr. Software Engineer (C# .NET)

Triwill Group; United States; On-site; USD 140,000 - 190,000; Full time

Job summary

Triwill Group is seeking a Sr. Software Engineer in the United States to build scalable APIs using C# and .NET Core, with a focus on reliability and performance.

You will balance hands-on development with technical leadership, architecture discussions, testing, and continuous improvement while collaborating with cross-functional teams.

This role offers exposure to AWS, Kubernetes, OpenTelemetry, PostgreSQL and modern cloud practices across critical business capabilities.

Qualifications

• Proven experience with C#/.NET Core in production.
• Ability to design scalable APIs and high-performance systems.
• Experience leading technical discussions and mentoring peers.
• Familiarity with cloud platforms and observability practices.

Responsibilities

• Design and evolve scalable APIs powering critical services.
• Lead architecture discussions and guide technical direction.
• Collaborate with cross-functional teams to deliver reliable software.
• Mentor engineers and promote engineering best practices.

Skills

C# / .NET

API design

Distributed systems

Mentoring

Tools

AWS

Kubernetes

OpenTelemetry

PostgreSQL

Job description

Description:

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Sr. Software Engineer (C# .NET) based in United States .

You’ll work primarily with .NET Core to design scalable APIs and contribute to reliable, high-performance applications.

The role combines hands‑on engineering with technical leadership, architecture discussions, testing, and continuous improvement.

You’ll collaborate with cross‑functional teams while helping shape core technology used across critical business capabilities.

The environment emphasizes engineering quality, observability, performance, knowledge sharing, and modern cloud practices.

You’ll have opportunities to work with AWS, Kubernetes, OpenTelemetry, PostgreSQL, and other contemporary technologies.

This role is ideal for a technically strong engineer who enjoys solving complex problems, mentoring peers, and continuously improving how software is built.