Senior Software Engineer, Full-Stack (Agentic Platform)

Supio co; Seattle (WA); On-site; USD 180,000 - 255,000; Full time

Benefits offered by this job

Health insurance

Dental insurance

Vision insurance

Life insurance

Flexible Time Off

Remote work day (Tuesdays)

Pre-tax parking contribution

Commuter subsidies

Team gatherings and offsites

Job summary

Supio is hiring senior full-stack engineers to build the agentic platform for law firms, combining AI with deep legal expertise. You will own features end-to-end in TypeScript, from UI to services, delivering production-grade AI systems with autonomous ownership within a hybrid Seattle/San Francisco setting.

Ideal candidates bring true full-stack depth, strong product sense, and hands-on AI/LLM experience, with a startup background and comfort with ambiguity.

Qualifications

• True full-stack depth across the whole stack (front end to back end).
• Strong product sense and ability to translate user needs into solutions.
• Hands-on experience shipping AI/LLM systems in production.

Responsibilities

• Build agentic platform capabilities (voice, transcription, records extraction, drafting).
• Develop the agent runtime: prompts, tool management, cost/performance optimization.
• Create and maintain the core full-stack application used daily by customers.
• Deliver production ML-driven features with monitoring and observability at scale.

Skills

Full-stack depth

React/TypeScript

Applied AI/LLM

Coding agents

Startup experience

Autonomy

Tools

Backend services

APIs

Job description

View all jobs Senior Software Engineer, Full-Stack (Agentic Platform) Seattle Hybrid • San Francisco Hybrid Software Engineering Hybrid Full-time

About Us

Supio is a trusted AI platform purpose-built for law firms, reshaping how data drives impactful outcomes. Our innovative approach blends technology with deep legal expertise, making us a leader in our field. We go beyond surface-level AI to deeply understand our customers’ daily needs, empowering law firms with unparalleled data insights. Supio delivers human-level, accurate analysis of complex data and legal records, quickly and efficiently bringing critical insights when they matter most. Trusted by top litigation lawyers, our platform has supported over $1 billion in settlements. Headquartered in Seattle with an office in San Francisco, we raised $60M Series B in April 2025 led by Sapphire Ventures with Mayfield and Thomson Reuters Ventures, bringing total funding to $91M. We're scaling rapidly and looking for exceptional talent to join us in this next phase of growth. We're looking for passionate team members who are motivated by our mission and ready to help us achieve it.

Who we're looking for

We're hiring senior, product-minded full-stack engineers to build Supio's agentic platform — applied AI at the core, 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 have hands‑on experience shipping LLM/AI systems in production, you're fluent using coding agents in your daily workflow, and you operate with real autonomy. You've thrived in a startup environment and you're excited to build greenfield.

What you'll build

(scope depends on team placement)

• 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
• The core full‑stack application customers work in every day
• Production LLM‑driven 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, AI‑native platform, with senior autonomy and end‑to‑end ownership.

What you'll bring (must-haves)

• 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.
• Hands‑on applied AI/LLM systems experience. You've built real systems end‑to‑end and can speak to what you owned and what broke in production.
• Fluency with coding agents as part of how you build.
• Startup background. Comfortable with ambiguity, speed, and greenfield.
• Autonomy and ownership. Able to meet in‑office/hybrid expectations in Seattle or San Francisco.

Nice to have

• 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. Seattle: $180,000–$255,000 annually. San Francisco: $200,000–$255,000 annually. Actual compensation depends on qualifications, skills, experience, and location.

• Competitive Salary + Meaningful Equity
• 401(k)
• Health, Dental, Vision, and Life Insurance
• Flexible Time Off + Holidays
• High‑autonomy work environment, every Tuesday is a Remote Work Day
• DoorDash subsidies for breakfast and dinner; Daily lunch options
• Boba Wednesdays
• Monthly commuter subsidies and pre‑tax parking contribution
• Team gatherings and offsites

E-Verify Participation Notice

Supio participates in E‑Verify, an employment authorization program through the U.S. Department of Homeland Security and the Social Security Administration.

Equal Employment Opportunity (EEO) Statement

Supio is committed to creating a diverse environment and is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.