# Thomas Jeu **Senior Software Engineer — Mobile & Full-Stack** jeuthomas03@gmail.com · +64 22 104 5335 · thomasjeu.fr · Hamilton, New Zealand · github.com/thomasjeu03 ## Summary Full-stack engineer with 5+ years shipping production mobile and web apps. Founder of Powor, a social training platform on iOS with 600+ users, built end-to-end on React Native/Expo, NestJS and MongoDB. Owns complete systems — on-device and vision ML pipelines, RevenueCat subscriptions, CI/CD and App Store operations. ## Experience ### Founder & Lead Engineer · Powor — Gym Community 2025 — Present · Hamilton, New Zealand · On-site - Grew to 600+ users by shipping a social workout platform solo (React Native/Expo, NestJS, MongoDB) — feed, following, rankings and challenges layered on a full training tracker. - Built Body Scan on a dual-tier OpenAI vision pipeline and IMU-based exercise recognition with CoreML, routing the common path to a cheaper model to keep per-request cost down. - Lifted subscription conversion 30%+ with A/B-tested RevenueCat paywalls, free-trial flows and multi-currency pricing, shipped across five localisations. - Reached v1.17 since the November 2025 launch on Xcode Cloud CI/CD and TestFlight, with zero rejected builds in production. *Stack: React Native, Expo, NestJS, MongoDB, watchOS, CoreML, RevenueCat, OpenAI API, Xcode Cloud* ### Full-Stack Developer & Design Lead · Caddev Agency 2023 — Present · Remote · Remote - Delivered 10+ client projects on time by building a shared design system (React/Tailwind), cutting per-project UI setup by ~40%. - Architected the component library and multi-tenant NestJS APIs (Keycloak, CapRover/Docker) behind Nevven, a CRM-ERP for the construction sector. - Led Figma-to-code handoffs and atomic design standards, adopted by 3 junior developers. *Stack: React, NextJS, TailwindCSS, NestJS, Keycloak, Docker, CapRover, Figma* ### Freelance Software Engineer · Independent 2023 — 2025 · Remote · Remote - Delivered 15+ SPAs and iOS apps end to end; built Wonder Story (React Native + NextJS + Prisma, 100+ users) from zero to App Store independently. - Prototyped CrachMove, a macOS computer vision app (MediaPipe, OpenCV) for real-time rep counting via webcam — shipping a working demo in under 2 weeks. *Stack: React Native, NextJS, Prisma, MediaPipe, OpenCV* ### Front-End Developer · Koredge Agency 2022 — 2023 · France · On-site - Shipped 8+ pixel-perfect integrations (ReactJS/NextJS) and reduced load time ~25% on a high-traffic site via lazy-loading and code-splitting. - Established ESLint/Prettier standards across the team, cutting code-review cycles by an estimated 20%. *Stack: ReactJS, NextJS, TypeScript, ESLint, Prettier* ## Selected work ### Powor — Gym Community 2025 — Present · iOS + watchOS · Social fitness platform · Founder & Lead Engineer — solo build What Strava did for running, for lifting. A social feed, following, PRs and rankings layered on a full training tracker. Every layer is mine — the app, the API, the ML behind Body Scan, and the release pipeline. - Built the social layer end to end — feed, following, likes and comments, rankings and challenges — so a logged session becomes something friends actually see. - Modelled the training domain properly: sets, reps, load and RPE per exercise, feeding PR detection, progression analytics, streaks and achievement badges through MongoDB aggregation pipelines rather than client-side maths. - Shipped Body Scan on a dual-tier OpenAI vision pipeline, routing the common path to a cheaper model and escalating only on low confidence, so per-request cost stays flat as usage grows. - Architected IMU-based exercise recognition with CoreML, running inference on-device so logging keeps working without a network round trip. - Engineered A/B-tested RevenueCat paywalls, free-trial flows and multi-currency pricing that lifted subscription conversion by 30%+. - Localised into five languages and set up Xcode Cloud and EAS Build CI/CD with TestFlight distribution — v1.17 shipped since the November 2025 launch, zero rejected builds. *Stack: React Native, Expo SDK 57, NestJS, MongoDB Atlas, watchOS, SwiftUI, CoreML, RevenueCat, OpenAI API, Xcode Cloud* [App Store](https://apps.apple.com/app/apple-store/id6747926790?pt=127934195&ct=From%20Instagram%20Thomas&mt=8) ### Nevven — The CRM built for small and mid-sized businesses 2023 — Present · Web platform · Design system · Design system architect & full-stack developer A multi-tenant CRM used by French SMEs to run clients, quotes, invoices, projects and purchasing in one place. I own the design system the whole platform is built from, plus the API and deployment layer underneath it. - Architected the component library and design system the platform is assembled from, standardising forms, data tables, filters and workflow patterns so feature teams compose instead of rebuild. - Built the dashboard layer — configurable widgets over quotes, invoices and revenue — on aggregations that stay fast as tenants accumulate years of history. - Built multi-tenant NestJS APIs with Keycloak authentication, isolating tenant data while keeping a single deployable service. - Containerised delivery with Docker and CapRover, removing manual deployment steps across three projects. - Led Figma-to-code handoffs and enforced atomic design standards, adopted by three junior developers. *Stack: React, TypeScript, TailwindCSS, NestJS, Keycloak, Docker, CapRover, Figma* [nevven.io](https://nevven.io) ## Technical skills - **Mobile:** React Native, Expo SDK 57 (EAS), SwiftUI, Apple Watch / watchOS, CoreML - **Frontend:** ReactJS, NextJS, TypeScript, TailwindCSS, SVG & animation, Atomic design - **Backend:** NestJS, Node.js, REST, WebSockets, Keycloak, CapRover, Docker - **Data:** MongoDB Atlas, Prisma, Mongoose, Aggregation pipelines - **AI & ML:** OpenAI API, CoreML, MediaPipe, IMU sensor processing - **DevOps:** Xcode Cloud, EAS Build, GitHub Actions, CI/CD, Vercel, Supabase - **Payments:** RevenueCat, Stripe - **Tooling:** Figma, Git, ESLint, Prettier, Jira, Resend ## Education - **Bachelor — Web Development** — HETIC (2022 — 2023) - **DUT MMI — Multimedia & Internet Technologies** — IUT (2020 — 2022) ## Languages - French: Native (C2) - English: Professional working proficiency (B2) ## Interests Strength training · Open source · Software architecture