Senior Full-Stack Engineer; Backend-Leaning

🏦 4 days a week at the office

This position requires U.S. work authorization; only U.S. citizens or permanent residents will be considered.

Mission is a platform for hiring, vetting and managing software development talents. It enables our clients to connect with the world’s best talent to build mission‑critical software products.

An AI-native procurement platform that uses intelligent sourcing agents to automate procurement workflows, helping enterprises buy faster, smarter, and more efficiently across industries like manufacturing and retail.

Backed by top-tier investors, the founding team brings deep expertise in procurement, AI, and software engineering, offering the chance to join an early team building a category-defining product

We’re hiring a Senior Full-Stack Software Engineer to become a cornerstone of our early technical team. You’ll build critical features end-to-end across the platform, owning major components in both the frontend (React + Type Script) and backend (Node.js / NestJS / Postgre

SQL), while also managing and scaling our AWS infrastructure.

This is a senior, backend-leaning full-stack role (≈60–70% backend) for an experienced startup builder who can independently ship production systems, make architectural decisions, and own problems end-to-end. With no heavy process or layers of management, engineers drive roadmap, technical direction, and delivery.

You’ll integrate AI/LLM services into production systems, collaborate closely with AI/ML engineers, contribute to architectural decisions, and help shape the engineering culture. Candidates with experience leading small teams or mentoring others are especially encouraged—this role has room to grow into Technical Lead as the company scales.

• Build and scale core platform features across the fullstack
• Develop and ship AI agents and LLM workflows in production
• Own parts of AWS infrastructure and deployments
• Implement embeddings, vector search, and retrieval systems
• Shape architecture and technical trade-offs
• Mentor engineers and contribute to planning and execution

• Frontend:
  React, Type Script
• AI & Data: LLM APIs, embeddings, vector search, ETL
• Infrastructure: AWS (ECS, Fargate, Lambda, S3, RDS), Terraform, Docker

• 6+ years full-stack experience, including startup environments (at least2 years)
• Strong Node.js/API and system design skills
• Solid React + Type Script
• Experience integrating AI/LLM features into production
• Hands‑on AWS and infrastructure as code
• Highly autonomous; comfortable owning decisions and outcomes
• Experience mentoring or leading projects

• Competitive salary + meaningful equity
• Flexible PTO and full benefits
• Hybrid NYC team
• Direct access to founders
• Ownership of core systems and real, measurable impact