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Mobile2024

FieldKit Mobile

An offline-first field app for inspection crews working where connectivity isn't guaranteed.

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The Challenge

Crews worked in basements, tunnels and rural sites with no signal. The existing app assumed connectivity, so data was lost, duplicated or re-keyed back at the office.

The Solution

We designed the app offline-first: a local database is the primary store, and a conflict-aware sync engine reconciles with the server when a connection returns. The office sees results as soon as a device syncs.

Inspection capture flow
Sync status screen
Key Features
01

Offline capture

Full inspection workflows, media and signatures work with no connection.

02

Conflict-aware sync

Deterministic merge rules resolve edits made on multiple devices.

03

Back-office review

Web app for scheduling, assignment and sign-off on completed work.

04

Media pipeline

Photos are compressed and queued on-device, uploaded when bandwidth allows.

Architecture
  1. 01Mobile

    React Native (Expo), SQLite local store, background sync tasks

  2. 02API Layer

    Sync endpoint with change-tracking, auth via short-lived tokens

  3. 03Services

    Sync reconciliation, media processing and notification workers

  4. 04Database

    PostgreSQL with per-record version vectors for merge

  5. 05External Integrations

    Object storage for media, asset register sync

Technology

Frontend

  • React Native
  • Expo
  • TypeScript
  • React

Backend

  • Node.js
  • Fastify

Database

  • SQLite
  • PostgreSQL
  • S3

Cloud

  • AWS
  • Lambda
  • CloudFront

DevOps

  • EAS
  • GitHub Actions
  • Sentry
Results
  • Field data captured reliably without signal
  • No more re-keying at the office
  • Predictable sync crews can trust
  • One review workflow for every site
Gallery
Inspection capture flow
Sync status screen
Back-office scheduling
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