Mobile & full-stack software engineer

I build useful
things that move.

I’m Moses Esan, a product-minded engineer based in Barcelona. I design and ship production web and mobile products end to end — from architecture and APIs to the App Store.

Explore my work ↓Let’s work together ↗
Portrait of Moses Esan
Barcelona, ES
10+years building
software
iOS + Androidone product mindset
across platforms
0 → 1from first idea
to shipped product
Available for thoughtful collaborations

Selected work

Products with a point of view.

The best work sits where a real user need meets careful engineering. These are a few products I’ve taken from idea to release.

01

Founder / Product Engineer · 2026 — Present

AthleteOS

An offline-first fitness app for workout tracking, training planning, recovery and progression analysis. Designed around reliable local data, meaningful trends and a calm, consistent training experience.

Stack React Native · TypeScript · SQLite · Supabase · RevenueCat · Sentry

App Store ↗Google Play ↗App Evolution ↗
AthleteOS muscle focus dashboard
AthleteOS training stats dashboard
AthleteOS weekly training dashboard
AthleteOS active workout session
AthleteOS muscle recovery dashboard
AthleteOS exercise library
AthleteOS workout templates
AthleteOS workout library
01 / 08
02

Independent Product Engineering · Mesan Digital Ventures · 2025 — Present

SwapLibro

A mobile marketplace for local book exchanges, with city-based discovery and credit-backed swap workflows. Includes ISBN scanning, metadata lookup, wanted-book matching and curated shelves.

Stack React Native · TypeScript · Supabase · PostgreSQL · TanStack Query · MMKV

App Store ↗
SwapLibro credits wallet
SwapLibro book detail and exchange screen
SwapLibro book requests and notifications
SwapLibro books near you discovery screen
01 / 04
03

Product build · 2025

DropIt Geo

A location-based photo sharing app built end to end, combining a focused mobile experience with an Express.js API, PostgreSQL and Supabase.

Stack React Native · Express.js · PostgreSQL · Supabase

App Store ↗

A product in motion

AthleteOS is growing
with the athlete.

What started as an offline-first workout tracker is becoming a more complete training companion — bringing session history, progression trends, recovery and premium access into one focused product.

See the AthleteOS app evolution ↗

Career, so far

Building in public,
learning everywhere.

May 2025 — Present

Mobile Software Engineer

Workvivo (Zoom) — Ireland

Building the employee experience platform used for internal communication, engagement and workplace collaboration.

  • Develop and maintain reusable React Native features for iOS and Android, integrating REST APIs and real-time services.
  • Collaborate with product, design, backend and QA teams across Agile delivery, CI/CD and App Store / Google Play releases.

May 2022 — Jan 2025

Software Engineer II

FieldAware by GPS Insight — Dublin, Ireland

Built field service management features for technician scheduling, job management and operations.

  • Delivered product features with Python, Flask, React and Storybook while supporting technician and operational workflows.
  • Expanded automated coverage with Pytest and Unittest and maintained CircleCI pipelines for testing and deployment.
  • Contributed to an authentication service redesign integrating FusionAuth for identity and user management.

Feb 2018 — Apr 2022

Software Developer

RTÉ — Donnybrook, Dublin

Developed digital media products for Ireland’s national public service broadcaster.

  • Built high-availability Django and React applications, contributing to architecture, code reviews and frontend performance.
  • Created a real-time AngularJS analytics dashboard for editorial teams and led work on RTÉ’s main and radio websites.

Tools of the trade

Curious by default.
Practical by design.

React NativeTypeScriptReactPythonDjangoFlaskNode.jsSupabasePostgreSQLSQLiteTanStack QueryCI/CD