Sr Full Stack Engineer
Colossus Technologies Group · New York, NY
About this role
The candidate will join an early-stage, well-funded team building a greenfield, AI-native platform. Responsibilities include designing and building systems across React, Python, .NET, and PostgreSQL. The role involves building LLM-based agents and agentic workflows, integrating LLMs, RAG, and orchestration into production applications. The engineer will also help establish engineering standards for scalability, testing, and maintainability while partnering with product and design teams. The position is a high-ownership role focused on shaping architecture and developing production AI agents.
Skills & technologies
Nice to have
- LangGraph
- OpenAI Agents SDK
- Claude Agent SDK
- Pydantic AI
Read full description
Senior Full Stack Engineer – AI Platform
We’re hiring a Senior Full Stack Engineer to join an early-stage, well-funded team building a greenfield, AI-native platform. This is a high-ownership role where you’ll help shape the architecture, build across the stack, and develop production AI agents and agentic workflows
.What You’ll D
- oDesign and build systems across React, Python, .NET, and PostgreSQ
- LOwn features and architecture end-to-en
- dBuild LLM-based agents and agentic workflow
- sIntegrate LLMs, RAG, tool use, and orchestration into production application
- sHelp establish engineering standards around scalability, testing, and maintainabilit
- yPartner closely with product and design to influence what gets buil
tWhat We’re Looking Fo
- rStrong full-stack engineering and architecture experienc
- eHands-on experience with React and backend developmen
- tExperience building with LLMs and generative A
- IUnderstanding of prompt design, RAG, context management, evaluation, and tool us
- eIdeally, experience with agent frameworks such as LangGraph, OpenAI Agents SDK, Claude Agent SDK, Pydantic AI, or simila
- rComfortable working in an early-stage environment with significant ownershi
