Nicolas Simon

Mapped the full system landscape (~50 services across 4 business domains) and drove its decommissioning: 11 legacy services retired in 2025, 15 more through the 2026 migrations

Architecture I steer: 500+ REST endpoints on 26 NestJS services, RabbitMQ across 38 services, PostgreSQL, Redis, S3; Kubernetes, ArgoCD, Terraform

Took the generic State/Status engine from design study (6 architectures compared, up to Temporal workflows) to production: lifecycle roll-up across orders, missions, tasks and roundtrips, now ~74,000 state updates a day

Architect of PDT26, the transport-plan engine replacing the legacy calendar: 73 documented design decisions, taken to a site pilot at Wissous

Drove the data-model redesign (Order → OrderMission → Mission) and managed the plan to cut off the legacy one-entrypoint distributed monolith

Designed the consolidation of 4 overlapping systems (monolith, dispatcher, mobile gateway, sourcing) into a single Fleet service, cut over in two batches (first batch live Oct 2025)

Led the IAM authorization overhaul: 250+ PRs across 42 repositories, largely executed by AI coding agents from a written spec; 300+ API routes secured and 11 production services cut over with zero auth incidents (feature flags)

Led the 2026 geocoding centralisation: every call behind one service (~85% served from cache) and a cheaper provider chain, as accurate as Google, projected to cut geocoding costs by ~95%

Platform: NestJS 11 upgrades, Kubernetes, GitOps/ArgoCD, Terraform (Auth0/IAM), feature flags, per-PR preview environments, Datadog

AI-native delivery: agent-driven migrations, Claude Code plugins, MCP tooling

Led delivery of the new central back-office within a year: one tool for ~150 internal users (customer care, dispatch, transport), built to retire 2 legacy back-offices and the legacy auth system

Lead the Core team: 5 developers (2 senior, 2 mid-level, 1 junior) within a ~19-person tech team, partnering daily with Product on roadmap and scope; run rituals and retros, and hire

Helped steer all the application changes of the move from hosted VPS to Kubernetes, then redesigned the dev & release process across 60+ services (GitHub Actions shared workflows, semantic-release, Renovate, Terraform-managed permissions): release preparation time divided by ~3

Shipped 20+ retail client integrations (e.g. ManoMano, Alinéa, Poltronesofa, Vente Unique, Emma) and drafted the generalisation of client interop, how clients connect to Trusk: EDI intake split into a generic parser and readers, shared EDIFACT library

Managed the Order Taking squad (4 developers, reporting to the CTO) in Scrum on Linear, writing ~2,300 tickets, and its roadmap with the Product Manager

Main developer of the B2B pricing engine: per-client price grids for ~10 retail accounts (IKEA, Alinéa, Conforama, Fermob…) billing ~€1.6M a year

Main backend developer of the first version of the driver-app API (alpha 2 → 6); built the push-notification and SMS-template micro-services from the first commit; redesigned the WMS (Warehouse Management System)

Made EDI order intake generic; top committer as it reached 13 retail integrations

Ran cross-service platform migrations: 161 PRs across 22 services (container builds to Google Container Registry, shared CI configs, Datadog tracing); moved 9 micro-services onto the shared RabbitMQ module with AsyncAPI docs

Grew into the lead role: release manager, sprint prep, more reviews than own PRs