Claude Code
For deep codebase exploration, considered implementation work, refactoring and maintaining context across larger engineering tasks.
Freelance mobile app developer · Lincolnshire, UK
Freelance mobile app developer for iOS and Android.
I’m Paul Ledger, a freelance developer combining decades of engineering experience with Claude Code, Codex and Cursor to deliver dependable iOS, Android, web and cloud products efficiently.
About
Decades of engineering experience, amplified by AI.
I’ve been creating apps since the Apple App Store opened and have delivered more than 35 applications for clients and my own company. Today I combine that experience with an AI-native workflow using Claude Code, Codex and Cursor.
These tools help me understand existing codebases, explore solutions, implement focused changes and verify work faster. They don’t replace engineering judgement—they remove routine friction so more time goes into architecture, product quality and the user experience.
My technical work spans native Swift and Objective-C for Apple platforms, Kotlin and Java for Android, plus C#, .NET, SQL Server and Azure for the services behind them.
AI-assisted development
Experienced judgement, accelerated by modern coding tools.
I use AI as an active engineering partner: exploring codebases, testing ideas, implementing focused changes and removing repetitive work while retaining human review and responsibility for every outcome.
OpenAI Codex
For agentic development workflows: turning defined goals into reviewed code changes, verification and clear delivery stages.
Cursor
For fast, in-editor iteration, targeted code assistance and keeping development momentum during day-to-day implementation.
The result: faster investigation and delivery, with architecture, security, testing and product decisions still guided by professional engineering judgement.
Services
Practical product development for real businesses.
01
iOS development
Native iPhone and iPad applications using Swift, Objective-C and Apple’s platform frameworks.
Explore iOS development02
Android development
Native Android products using Kotlin and Java, shaped around the audience and business need.
Explore Android development03
Complete app delivery
Mobile product development supported by websites, APIs and cloud systems built with .NET, C#, SQL Server and Azure.
Explore mobile app developmentShowcase
Independent product development, accelerated by AI.
A closer look at products where experienced engineering, focused iteration and modern AI collaboration come together.
OpenAI Build Week · Devpost submission
Road Speed Calibrator
An iPhone app that turns roadside video into transparent, reviewable speed estimates using timestamp-accurate tracking and perspective-aware road calibration.
Created as an independent project during OpenAI Build Week, with Codex and GPT-5.6 used as an engineering collaborator throughout the SwiftUI build, testing and evidence workflow.
- Uses actual video frame timestamps rather than assumed frame rates
- Calibrates the road plane with a top-down perspective view
- Produces visible vehicle trails, calculation summaries and evidence exports
Designed for indicative, evidence-led speed assessment—not certified enforcement.
Read the full case study View the Devpost submission
iOS game development · Devpost submission
ScubaWord
An underwater word-search adventure where solving words clears letter tiles and reveals the next grid deeper beneath the surface.
Developed with Codex as a product and engineering collaborator across requirements, architecture, SwiftUI and SpriteKit implementation, gameplay tuning, testing and visual asset preparation.
- Ten-level procedural campaign with eight-direction word selection
- Animated underwater transitions, score feedback and treasure finale
- Detailed public progress records showing how the product evolved
Selected work
Apps delivered across a wide range of sectors.
A selection of products I have helped design, build and release across public services, education, media, enterprise and independent projects.
Client feedback
Trusted to communicate clearly and deliver under pressure.
Feedback from mobile application projects delivered for agencies, businesses and product teams.
Working with Paul has been a delight. Paul developed an iPhone and Android app for us, and we were very impressed with the professional service and speedy response to any queries. The overall app was perfect; we look forward to doing business again soon.
Paul worked on our first delivery of an iPad application to one of our clients. He was diligent, quick and a good communicator. He never missed a beat, despite us throwing a few curve balls his way. Looking forward to working with him again.
It was a pleasure to work with Paul on a bespoke iPad app with a very tight deadline. He is one of the easiest developers I have worked with, providing new builds and progress updates without being prompted. The project was a great success.
Paul has been very easy to work with: always on hand to answer questions, putting in the extra hours needed to deliver on time, and fast at ironing out problems and researching solutions. A pleasure to work with.
It was great working with Paul. He was always able to meet the challenges thrown his way and communicate clearly. We will look for his expertise for future iPhone development.
From experience
Thinking about working freelance?
I’ve collected the lessons I learned from contracting, independent product work and working directly with clients.
Read the freelancing articleContact
Have a product idea or an existing app that needs help?
Tell me a little about the users, platforms and outcome you have in mind.
Email
business@flexicoder.com