Senior Software Engineer (Back End)

About this role

About mpathic

mpathic is building the future of trustworthy AI. Grounded in behavioral science and human-centered design, we provide the infrastructure for building AI systems that are safe, aligned, and emotionally intelligent.

Building on our work in areas like RL gyms, red teaming, benchmarking, and human data, we are creating the foundation for training, probing, and measuring advanced AI systems reliably, auditably, and at scale.

Position Overview

mpathic is seeking a Senior Software Engineer (Back End) to help design, build, and scale the systems that power our platform and AI safety work.

This role will focus primarily on backend engineering using .NET (C#) and AWS, with responsibility for building reliable APIs, services, data infrastructure, and cloud-native applications. You’ll work closely with engineers and cross-functional partners to solve complex technical problems, improve the scalability and performance of our systems, and support the integration of AI models into our products and workflows.

We’re looking for an experienced engineer who is comfortable owning problems end-to-end, making thoughtful architectural decisions, and operating in a fast-moving environment where the problems we’re solving are still evolving.

About You

• Proven Experience: 5+ years of software engineering experience, with a strong focus on backend development using .NET (C#).
• AWS Proficiency: Hands-on experience with AWS services, architecture, and best practices for building and operating cloud-native applications.
• Database Expertise: Strong experience with SQL and NoSQL databases, including schema design, data modeling, query optimization, and performance.
• System Design: Experience designing scalable, reliable backend services, APIs, and distributed systems.
• Frontend Familiarity: Working knowledge of React and its ecosystem, with the ability to collaborate effectively across the stack.
• Technical Ownership: Comfortable taking ambiguous technical problems fro...