Backend Engineer (AI)

TL;DR

Backend Engineer (AI): Building and designing agentic systems with queues, workers, and idempotency with an accent on planning, tool-using executors, reflection/critique loops, and multi‑agent workflows. Focus on hardening security and leveling up DX.

Location: London/Relocation sponsorship

Salary: £150-180K/year

Company

1feed builds a pocket command layer that turns coordination into fast, high-signal microinteractions—so people and agents ship without distraction.

What you will do

• Design domain models, service boundaries, and clean REST APIs for our iOS app.
• Build event-driven systems: queues/workers, retries, backoff, DLQs, idempotency, outbox/saga patterns.
• Design and build agentic systems: planners, tool‑using executors, reflection/critique loops, and multi‑agent workflows.
• Make data fly: PostgreSQL schemas, migrations, indexes; Redis for caching, locks.
• Ship production-grade reliability: observability (metrics/traces/logs), SLOs, on-call readiness, perf profiling.
• Harden security: secrets management, least-privilege, input/tenant isolation, safe PII handling.
• Level up DX: CI/CD, testing strategy, code reviews, docs, and ruthless simplicity in implementation.

Requirements

• Have deep Node.js/TypeScript experience and write clear, composable NestJS code.
• Can design asynchronous, fault-tolerant workflows with queues, workers, and idempotency.
• Speak SQL fluently: indexing, locking, transactions, and performance.
• Care about API ergonomics and compatibility over time.
• Treat reliability, security, and observability as first-class features.
• Move fast with judgment and communicate crisply.

Nice to have

• AI experience (LLMs, agents, RAG/vectors).
• Product instincts and taste for simple, focused UX.
• Security/privacy by design; secrets, PII handling, and pragmatic compliance.
• iOS/SwiftUI collaboration experience.

Culture & Benefits

• Engineering-first product and team principles.
• Humans build and create; AI orchestrates.
• Interaction efficiency.
• Craft & Beauty.