Backend Developer SR (AM - BE - 20260512) at celaralabs

<div> <p style="margin-top: 12pt; margin-bottom: 12pt;"><span style="font-size: 11pt; font-family: Arial, sans-serif;">We're looking for a modern, AI-empowered engineer — strong fundamentals, opinionated about good design, and fluent in agentic tooling — to help build and launch a new digital purchase platform. Someone who codes fast, leads by example, and can hold their own in product conversations as easily as in technical ones.</span></p> <p style="margin-top: 12pt; margin-bottom: 12pt;"><span style="font-size: 11pt; font-family: Arial, sans-serif;">The project is for a major company modernizing how customers buy online — standing up a modern stack to run the full purchase flow online, end-to-end. We're building a brand-new back-end: a modern integration layer to multiple third-party provider APIs, the AI plumbing to power agentic features across the funnel, and an agent-facing dashboard ("Agent Co-Pilot") that lets human agents see live shoppers in real time and jump into the conversation when needed. The first AI lighthouse is a customer-facing chat assistant tied into that same plumbing — pricing, configuration, eligibility checks, hand-off to a human. This is a 3-month foundation build with a senior, hand-picked team, kicking off ASAP.</span></p> </div> Responsibilities: • Build and own provider connectors on the new integration framework — auth, retries, webhooks, observability, etc. • Lead by example on technical direction — drive design discussions, unblock the team, and own the hardest pieces of the stack. • Partner with the client's PM and product stakeholders in 1–2 week sprints — daily standups, weekly demos — pushing back on scope, proposing better solutions, and translating product intent into clean technical bets. • Ship AI features end-to-end against the lighthouse roadmap (chatbot, Agent Co-Pilot, plumbing for what comes next). • Set engineering practices the permanent team will inherit — clean code, tests, AI-generated docs, CI/CD, eval harnesses on LLM-touching code paths. • Pair with the architect and tech lead on cross-cutting design; mentor through code review. Why It's Interesting: • You'll be working alongside a talented, hand-picked senior team. • Greenfield rebuild, not legacy maintenance. We're migrating off the current vendor's platform onto a new, clean, modern codebase. You'll set the future patterns the new system gets built on. • Best-in-class agentic-AI SDLC from day one. You'll help design the patterns — Claude Code across the full SDLC, AI-generated documentation, evals on every LLM-touching feature, observability built in. • Interesting consumer AI features — a live-shopper dashboard, an in-funnel AI chatbot, and the plumbing for everything that comes after. • Path to lead the team going forward. This 3-month build is Phase 1. The client will then ramp a permanent squad on top of the codebase you helped create — clear path into the lead role. Skills Required: • 6+ yrs building production back-ends; comfortable owning a service end-to-end • Strong in a modern typed stack (TypeScript/Node or Python/FastAPI) • Built and maintained third-party API integrations at scale (auth, retries, rate limits, webhooks, idempotency) • Hands-on with agentic AI tooling — Claude Code in daily SDLC, LLM API integration, prompt + eval discipline • Opinionated and direct — pushes back on scope, holds the bar on docs and tests • Cloud + IaC (AWS or GCP, Terraform, Docker, CI/CD pipelines) • Bonus: VLM/RPA or browser-automation experience for provider fallback paths