Manifest OS is an AI-native company on a mission to replace the billable hour and make legal services more accessible for American businesses and consumers. We power the next generation of AI-native law firms with one unified global brand, a proprietary technology platform, and a centralized back office — enabling lawyers to eliminate the administrative burden and focus on delivering exceptional outcomes for their clients. Manifest OS has raised a $60M Series A from Menlo Ventures, Kleiner Perkins, First Round, and Quiet Capital.
About the RoleWe're looking for a Software Engineer to help build the legal tech platform powering the next generation of AI-native law firms. You'll own the development of secure client portals and enterprise-grade systems - from architecture to production.
This opportunity is ideal for engineers who want broad scope, high ownership and move nimbly across lanes. You'll work across AI systems architecture and full-stack engineering - eval systems, retrieval, agent orchestration, and optimization, alongside the APIs, data models, and systems that power the core platform.
This is an in-person role - you'll be on-site at our NYC office 5 days a week.
What You’ll DoEngineers here move across three areas as needed:
Product Engineering
Own end-to-end features across our legal tech platform - client portals, case management, and the workflows lawyers and clients depend on daily
Design production-grade APIs, data models, and permission systems for a regulated, high-trust domain
Agent Platform
Eval systems, retrieval, and agent orchestration - building the infrastructure that measures and improves how our AI agents perform
Harness engineering - building the tooling and guardrails that let the rest of the company build securely, reliably, and self-serve
Core Platform & Infrastructure
Database design and backend architecture
Deploy and operate services on cloud infrastructure
Must-haves:
7+ years building production software, with demonstrated depth in at least one area (backend systems, infra, ML/AI systems, frontend or similar)
Proven track record delivering features that produce measurable business outcomes
Comfort with relational database design and data modeling
Hands-on experience deploying and operating services on a major cloud platform
Fluent with AI coding tools as a core part of your daily workflow
A track record of self-teaching your way into unfamiliar systems and shipping there
First-principles and systems thinking: you can reason about a system you didn't build, from the database up through the API to the product surface
Familiarity with our stack - TypeScript, React, GCP, PostgreSQL
Nice-to-haves:
Deeply engaged with the AI tooling ecosystem - you follow new model releases, experiment with new tools as they land, and stay current out of genuine curiosity
Experience with eval systems, retrieval, agent orchestration OR ML in production
Background building client portals, CRMs, or case management systems
Familiarity with legal tech or other regulated industries
You treat AI tools as core to how you architect and ship software. You have real depth in at least one area, plus the self-teaching ability to pick up unfamiliar systems and contribute there competently. You move with speed, thrive with ownership, and prefer outcomes over process. You want to build infrastructure that makes legal services more accessible to people.
This is not for you if....You do your best work with clear processes and defined guardrails already in place. You're earlier in your journey with AI-augmented development and want more time to build that muscle first.
Skills Required
- 7+ years shipping fullstack TypeScript in production (React/Next.js and Node.js)
- Proven ability to deliver complete features end-to-end with measurable business outcomes
- Strong PostgreSQL or relational database design skills
- Experience building production APIs with proper error handling, monitoring, and documentation
- Hands-on cloud platform experience (GCP preferred; AWS or Azure acceptable)
- Daily use of AI coding tools for the majority of your development work
- Based in NYC and able to work in-office
- Experience at a high-hiring-bar tech company or VC-backed startup
- Shipped a production AI feature: RAG, LLM integration, agents, embeddings, or semantic search
- Currently working at a startup or growth-stage company under 1,000 employees
What We Do
Manifest OS is a legal technology company that powers the next generation of AI-native law firms. By providing a proprietary technology platform, a unified global brand, and a centralized back office, the company aims to replace the traditional billable hour model with outcomes-based fixed pricing, making high-quality legal services more accessible and predictable for businesses and consumers of all sizes.
