Backend Software Engineer (C#/.NET)

Methodic; San Francisco (CA); On-site; USD 140,000 - 210,000; Full time

Job summary

Methodic, based in San Francisco, seeks an experienced Backend Software Engineer (C#/.NET) for on-site, full-time work. You will design and maintain back-end services and APIs, focusing on high-throughput systems and secure fintech integrations.

You will collaborate across teams, write comprehensive tests, and contribute to deployment automation, aiming for reliability and scalable growth in a fast-paced startup environment.

Qualifications

• 5+ years of software development experience with C# and .NET.
• Experience building scalable, high-throughput distributed systems.
• Solid understanding of database design and performance with SQL databases.
• Familiarity with designing and consuming RESTful APIs or gRPC and integrating third-party APIs.
• Knowledge of secure coding practices and fintech compliance.

Responsibilities

• Design, develop, and maintain back-end services and APIs using C#/.NET, including core modules like Books and the compliance engine.
• Implement high-performance code and optimize system scalability for very high transaction volumes.
• Integrate external financial services and APIs into the system.
• Collaborate with frontend engineers, DevOps, and other teams to deliver end-to-end features.
• Write unit tests and integration tests; assist in automating deployments.
• Participate in code reviews and architecture discussions to improve security and reliability.
• Monitor production issues and help maintain uptime targets.

Skills

C#/.NET expertise

High-throughput systems

Problem solving

Agile/startup mindset

Tools

SQL databases

RESTful APIs

gRPC

Security best practices

Job description

Open role

Backend Software Engineer (C#/.NET)

San Francisco, CA (On-site)

Full-time

Responsibilities

• Design, develop, and maintain back-end services and APIs using C#/.NET, including core modules like our ledger and accounting systems (Books) and compliance engine.
• Implement high-performance code and optimize system scalability to handle very high transaction volumes (e.g. up to 2 million transactions per second per client).
• Integrate external financial services and APIs (e.g. banking partners, brokerage platforms) into our system, ensuring data flows smoothly and securely.
• Collaborate with front-end engineers, DevOps, and other team members to deliver end-to-end features and ensure seamless integration across the platform.
• Write unit tests and integration tests to ensure code quality and compliance with regulatory requirements; assist in automating deployments for smooth releases.
• Participate in code reviews and architecture discussions, contributing to best practices for system design, security, and reliability.
• Monitor and troubleshoot production issues related to backend services, helping to maintain our 99.999% uptime target.

Requirements

• 5+ years of software development experience with strong proficiency in C# and the .NET ecosystem.
• Proven experience building scalable, high-throughput distributed systems (multi-tenant SaaS or financial systems experience is a big plus).
• Solid understanding of database design and performance (experience with SQL databases; ability to optimize queries and use indexes effectively).
• Familiarity with designing and consuming RESTful APIs (and/or gRPC) and integrating third-party APIs or SDKs.
• Knowledge of secure coding practices and basic understanding of fintech compliance (e.g., handling sensitive data, audit logging) or eagerness to learn.
• Excellent problem-solving and debugging skills; ability to identify bottlenecks and devise efficient solutions.
• Team-oriented attitude with strong communication skills; comfortable working in an agile, fast-paced startup environment.