Senior Backend Developer - AI

Salt

London,

£69,687 per year - estimated ?

Senior Backend Engineer

London (Hybrid)

Early-Stage | AI Platform | Enterprise-Grade Systems

We’re partnering with an ambitious early-stage AI company building a challenge-based interview intelligence platform. The product replaces CV-noise with real signal — evidence from real work and real human capability.

They’re in full build mode toward launch. Small team. High standards. High ownership. No corporate theatre.

They’re hiring a Senior Backend Engineer to build the enterprise backbone of the platform — high-concurrency APIs, event-driven systems, and reliability foundations that transform complex hiring inputs into secure, trusted, GDPR-safe outputs.

If you enjoy turning evolving product intent into production-grade systems that don’t flinch under load, this role will suit you.

What You’ll Own

Enterprise-Grade Architecture

• Standardised patterns from intake → build → QA → deploy → measure • Secure-by-default engineering • GDPR-safe, compliance-ready systems

Workflow Automation at Scale

• Scalable GraphQL APIs • Event-driven systems with strong reliability guarantees • Monitoring, logging, error handling & documentation that scales

What You’ll Build

• High-concurrency APIs with retries, idempotency, and queue-based reliability • Cloud-native architecture across GCP (with limited AWS usage for asset management) • Reporting and dashboard surfaces that remain consistent under load • Systems designed to scale confidently from 10 → 10,000+ users