Product Engineer | Fibr.ai

Bengaluru · In office · 2-5 years
Stack: Python · FastAPI · Temporal · PostgreSQL · MongoDB

The role
Fibr is building the agentic web experience layer - turning every URL into an intelligent agent that senses intent, makes decisions, and adapts in real time. Our agents personalise the full journey, running long LLM workflows against live customer accounts and millions of sessions.

You'll own features end-to-end - from the rough idea in a Slack thread to something shipped, instrumented, and behaving correctly in production. New surface areas land on your plate every few weeks: a new agent, a new integration, a new optimization loop. You're responsible for the whole thing, including the evals and metrics that prove it works. You'll work directly with the founding team and ship to real users every week.

What you'll do
Ship AI-powered features end-to-end - backend, data, LLM layer, and the surface the user sees
Design long-running workflows that hold up against rate limits, partial failures, and noisy third-party APIs
Build and maintain the evals, guardrails, and instrumentation that decide whether a feature is good enough to ship
Model the data behind agents and the analytics behind product decisions
Sit in on architecture calls and shape where the platform goes next

Must-haves
2-5 years of production backend experience
Has shipped LLM-powered features to real users in production - not demos, not side projects. Be ready to talk about what broke and how you fixed it
Has built and run evals for LLM systems. Show us the harness, the dataset, and the decisions it drove
Comfortable across relational and document databases
Has worked with a durable workflow or queue system in production
Ships fast without breaking the build
Nice-to-haves
RAG, vector stores, or tool-use / multi-step agents in production
Experience with rate-limited third-party APIs at scale (ad platforms, CRMs, analytics)
Strong product sense - you catch the UX issue before the user does
Time spent at an early-stage startup

How we work
High ownership, low bureaucracy. Decisions in the room, not in docs. You'll work directly with the founding team.

Why Fibr AI
Competitive salary + meaningful early-stage equity
A chance to build deep expertise at the frontier of AI product development