BigMantra is a Vertical Autonomous AI Agent Builder we build AI companies that go a mile deep into specific industries. Our products include Mantra Spaces (AI-powered UK HMO property management) and Verity Law (AI-powered legal conveyancing). Our team is small, our stack is modern, and your code ships to production the same week you write it.

We're looking for a Fullstack AI Applied Engineer who can build full applications end-to-end and wire AI agents into production systems that real users depend on.

WHAT YOU'LL DO :

- Build and ship full-stack web applications using React / Next.js and Python / Node.js

- Design and implement AI agent workflows using LangChain, LangGraph, Claude Agent SDK, Agno, or similar

- Integrate agents with real-world APIs Salesforce, Google Workspace, WhatsApp Business, email providers

- Build and optimize database layers production SQL, schema design, RAG pipelines

- Own deployment and infrastructure Docker services, CI/CD pipelines on AWS or Azure

- Write tests that matter E2E, load tests, performance benchmarks

- Collaborate directly with the founding team on architecture and product direction

MUST HAVE :

- 3+ years of professional software engineering experience

- Strong JavaScript / TypeScript React, Next.js, Node.js in production

- Strong Python backends, agent systems, data pipelines

- Hands-on experience with at least one AI agent framework (LangChain, LangGraph, Claude Agent SDK, Agno, or equivalent)

- Docker services for containerization and deployment

- CI/CD pipelines GitHub Actions, GitLab CI, or similar

- Deployment experience on AWS or Azure

- Solid SQL and database skills schema design, query optimization

GOOD TO HAVE :

- Experience with autonomous agents MCP (Model Context Protocol), skills, plugins, tool-use

- Memory and context management for long-running agents

- Prompt engineering and optimization