Senior Software Engineer, Full-Stack

Supio; San Francisco (CA); Hybrid; USD 200,000 - 255,000; Full time

Job summary

Supio is hiring senior/staff, product-minded full-stack engineers to build the core of Supio's platform — an AI-native product used in high-stakes, real-world legal workflows. You’ll own end-to-end development in TypeScript across the stack, from customer interfaces to services, with autonomy in a startup-paced environment.

Ideal candidates have 10+ years of experience, fluency with coding agents, and a proven track record across the full stack, with in-office/hybrid expectations in Seattle or

Qualifications

• 10+ years of professional software engineering experience.
• True full-stack depth across the stack (React/TypeScript front end and backend services).
• Strong product sense translating user needs into technical solutions.
• Fluency with coding agents as part of daily workflow.
• Experience operating at startup pace and ambiguity with autonomy.

Responsibilities

• Build the core full-stack application the product team uses daily.
• Develop agentic platform capabilities including voice, transcription, and document flows.
• Own the agent runtime: prompt/tool architecture and cost/performance optimization.
• Deliver production features with robust tooling, monitoring, and observability.
• Shape architecture and technical direction with end-to-end ownership.

Skills

10+ years experience

Full-stack depth

Product mindset

Coding agents fluency

Startup pace

Tools

React

TypeScript

APIs

Data pipelines

Job description

Who we're looking for

We're hiring senior/staff, product-minded full-stack engineers to build the core of Supio's platform — a fast-moving, AI-native product used in high-stakes, real-world legal workflows. You build product end-to-end in TypeScript across the stack, from the interfaces customers touch to the services behind them. You're fluent using coding agents in your daily workflow, and you operate with autonomy. You've operated at startup pace and ambiguity at some point in your career and you're excited to build greenfield.

What you'll build

(scope depends on team placement)

• The core full-stack application customers work in every day
• Agentic platform capabilities spanning voice calling & transcription, medical/financial records extraction, and legal document drafting
• The agent runtime - prompt/tool architecture, skill and prompt management, and cost/performance optimization
• Production features, plus the evaluation, tooling, and monitoring that keep them accurate and observable at scale

You won't just ship features — you'll shape the architecture and technical direction of a fast-evolving platform, with senior autonomy and end-to-end ownership.

What you'll bring (must-haves)

• 10+ years of professional software engineering experience
• True full-stack depth. You own product end-to-end, front to back. This isn't a front-end or backend specialist role; you're comfortable across the whole stack (React/TypeScript on the front end and modern backend services, APIs, and data pipelines).
• Strong product sense. You build customer-facing product and translate real user needs into technical solutions
• Fluency with coding agents as part of how you build
• Demonstrated experience operating at startup pace and ambiguity — moving fast with less process, owning decisions without a fully-formed spec — at some point in your career
• Autonomy and ownership. Able to meet in-office/hybrid expectations in Seattle or San Francisco

Nice to have

• Hands-on applied AI/LLM systems experience — you've built and shipped real systems and can speak to what you owned and what broke in production
• Prior experience at AI-native companies
• Formal ML background (optional — practical AI fluency matters more than credentials)

Compensation

Competitive package of base salary, meaningful equity, and benefits.

Base Salary: $200,000-$255,000 annually

Actual compensation depends on qualifications, skills, experience, and location.