Senior Software Engineer - Ai Surfaces

ABOUT THE ROLE 

As a Senior Software Engineer, you will build and own production agents end to end across the full stack. You will take an agent from a customer problem and rough specification through tool design, prompt and context work, an evaluation set, the Word or web experience, a feature-flagged launch, and follow-up improvements informed by acceptance data. 

You will work independently on well-scoped problems and collaboratively on ambiguous ones, directly with the founders and the rest of the team. 

• Level: Senior 

• Reports to: Lead or Staff Engineer, Gavel at Relativity 

• Location: Remote within the United States, Seattle, or Chicago 

WHAT YOU’LL DO 

• Design, build, and ship agents and agent capabilities end to end, including tools, prompts, context assembly, structured outputs, guardrails, services, and the frontend experience in Word or on the web. 

• Build and maintain evaluations for the capabilities you own. Use them to guide decisions and instrument production to measure acceptance, latency, and cost per agent. 

• Contribute to shared infrastructure, including the harness, context and retrieval pipeline, model routing, and observability stack. 

• Practice a modern software development lifecycle through small, frequent commits, feature-flagged production deployments, fast rollbacks, and daily use of agentic engineering tools. 

• Debug non-deterministic failures, retrieval misses, tool-call errors, and model regressions. 

• Participate in design reviews, write clear technical documentation, review code for other engineers, and mentor Advanced engineers. 

• Work directly with product, design, and, at times, customers to understand what good work product means for a given legal task. 

WHAT WE’RE LOOKING FOR 

Required 

• 5+ years of experience building production software in service-oriented, continuously deployed teams, including experience shipping LLM-powered features to real users through a launched project, not only experiments. 

• Direct experience building full-stack web applications and agentic applications, including API usage across providers, function calling and structured outputs, prompt and context engineering, retrieval-augmented generation, and evaluation fundamentals. 

• Hands-on cloud service development experience with AWS, Azure, or an equivalent platform, including containers, CI/CD, and production debugging, with a willingness to develop deep expertise. 

• Fluency in TypeScript or Python and the ability to work across a React frontend, Node or Python services, and PostgreSQL. 

• Experience writing and maintaining tests that catch regressions. 

• Strong engineering fundamentals in API design, data modeling, concurrency, performance, and reliability. 

• Good written and spoken English, with the ability to explain technical decisions succinctly to non-engineers. 

• A strong commitment to simplicity, demonstrated through open-source work, side projects, or past professional work. 

WHY WE COULD BE A GREAT FIT 

Impactful Mission 

• Build systems that help customers organize data, discover the truth, and act on it in high-stakes legal matters. 

Engineering at Scale 

• Work on distributed, cloud-native systems that process large volumes of data. 

Cutting-Edge Technology 

• Build with AI, cloud platforms, and scalable architectures shaping legal tech. 

Growth and Ownership 

• Gain experience owning systems end-to-end across cloud and distributed environments. 

Collaborative Culture 

• Work in a team focused on knowledge sharing and continuous improvement. 

Inclusive Environment 

• Diverse perspectives create stronger teams and better outcomes. 

Compensation and Benefits 

• Competitive salary, benefits, DTO, parental leave, and equity program.