Fullstack Developer New York City

Manifest OS; New York (NY); On-site; USD 120,000 - 160,000; Full time

Job summary

Manifest OS is seeking a backend-focused fullstack developer to join our AI-powered legal tech platform team in New York City. The role involves designing scalable systems and implementing AI workflows within a high-autonomy environment.

Applicants should have at least 7 years of experience in TypeScript, proficiency in database design, and hands-on cloud platform experience. Ideal candidates thrive on autonomy and impact.

Qualifications

• 7+ years shipping fullstack TypeScript in production.
• Strong PostgreSQL or relational database design skills.
• Hands-on cloud platform experience (GCP preferred).

Responsibilities

• Design and build scalable backend architectures for client and lawyer portals.
• Implement AI-powered workflows including document generation and case evaluation.
• Build and maintain secure APIs in Node.js/TypeScript.

Skills

Fullstack TypeScript

React/Next.js

Node.js

PostgreSQL

AI coding tools

Job description

About Manifest

Manifest OS is the leading 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 Role

We're building an AI-powered legal tech platform and need a backend-focused fullstack developer who treats AI tools as a core part of how they build — not an afterthought. You'll own features end-to-end across secure client portals and enterprise-grade B2B systems, from architecture to deployment. This is a high-trust, high-autonomy role on a small team where your decisions directly shape the product.

What You’ll Do

• Design and build scalable backend architectures for client and lawyer portals

• Implement AI-powered workflows including document generation, case evaluation, and conversational interfaces

• Build and maintain secure APIs in Node.js/TypeScript for internal and client-facing applications

• Ensure systems meet compliance requirements for legal documents, client data, and financial transactions

• Translate complex legal workflows into intuitive digital experiences alongside stakeholders

• Use AI development tools (Cursor, Copilot, v0) as a primary part of your daily coding workflow

• Own features from conception through deployment with measurable impact on user outcomes

What We're Looking For

Must-haves:

• 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

Nice‑to‑haves:

• Experience at a high‑hiring‑bar tech company or VC‑backed startup (Seed–Series C)

• 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

This is for you if....

You already use AI tools to move faster and architect better, not just autocomplete. You want autonomy over technical decisions on a product that directly affects real users. You thrive with minimal process and want your work to matter from day one.

This is not for you if....

You prefer large teams, established playbooks, and clearly scoped tickets. AI tools are occasional productivity helpers, not central to how you build. You're looking to specialize in one layer of the stack rather than own full features.