Native Apple product engineering
Senior iOS Developer
& Consultant
Clément Sauvage designs and builds native iPhone and iPad apps with Swift, SwiftUI and UIKit, from the first product decision to App Store release.
Discuss your project Explore the expertise- 2008
- Building digital products since
- 40+
- Apps shipped
- 400M+
- Cumulative downloads
Clément Sauvage · Bits’n Coffee
Who I work with
Clément Sauvage is a product engineer and senior iOS consultant based in Lille, France. Since 2008, he has helped startups, scale-ups, and established companies turn product ideas and difficult codebases into native iPhone and iPad apps.
His work spans product definition, Swift and SwiftUI development, UIKit interoperability, architecture, accessibility, release quality, and App Store delivery. He works remotely across France, Europe, the UK, and the US, travelling when a workshop or a critical milestone benefits from having everyone in the room.
Bits’n Coffee is the product engineering studio he founded. Clément leads every engagement himself and brings in trusted specialists only when the work calls for complementary expertise.
When to hire me
Where I come in.
Senior iOS experience matters most when product decisions and engineering decisions can no longer be separated.
What does your iOS product need?
You are launching a native iOS product
Turn a promising idea into a clear scope, a sound Apple-platform architecture, and a first version ready to ship. Product thinking and engineering stay in the same room.
Your existing app has become difficult to ship
Find out why releases have become fragile or feature work has slowed down, then restore a reliable route to production.
Your team needs senior Apple expertise
Add experienced, hands-on direction across architecture, code review, mentoring, platform choices, and delivery without building a new team around the role.
You are considering a SwiftUI modernization
Decide where SwiftUI will genuinely improve the product and the way the team works, then modernise the app step by step.
Services and capabilities
From the first decision to the final detail.
I can take ownership of the whole product or step into the part of an iOS delivery that needs senior attention.
iOS product development
Native iPhone and iPad development with Swift, SwiftUI, UIKit, and the Apple frameworks the product actually needs.
Architecture and technical direction
Architecture, state and data flow, dependencies, testing, and delivery practices chosen for the product and the people who work on it.
SwiftUI modernization
New features in SwiftUI, clean interoperability with UIKit, and gradual modernisation when a rewrite would create more risk than value.
App Store delivery
Build preparation, entitlements, in-app purchases, review requirements, and the practical work needed for a calm release.
Product rescue and audits
A clear-eyed review of the codebase, release process, and team, followed by a recovery plan that can actually be delivered.
Applied AI in native products
Useful AI features in a native app, designed around interface quality, response time, reliability, and privacy.
Relevant work
Built for the real world.
A few products I have helped launch, improve, and grow.
FeaturedIndependent product
Ottie
A little otter for procrastinators, with ADHD in mind. Small actions and a fully native Apple experience to help you start and stay on track. Ottie is by your side.
FeaturedLes Masters de Feu
Les Masters de Feu
A complete brand platform for the festival’s tenth anniversary.
FeaturedRester Jeune
Rester Jeune
Fractional technical leadership for a SaaS and mobile coaching platform, from 12,000 to 75,000 paying members.
Approach
From product question to App Store release
The work stays visible. Decisions are explained, working software is shown regularly, and release risks are dealt with before they become deadlines.
- 01Understand
Define the product and constraints
Start with the people using the product, the business goal, the systems already in place, and the Apple platforms that matter.
- 02Build
Ship in inspectable increments
Test architecture and interface choices in working software. Regular demos keep the scope honest and the product moving.
- 03Release
Prepare production, not just a build
Plan for testing, instrumentation, App Store materials, review constraints, and the people who will own the product after launch.
Frequently asked questions
Answers before the first call.
A clear first conversation starts with the right questions.
Does Clément work as a developer or as a consultant?
Both. I can join as a hands-on iOS developer, advise on a specific decision, or combine implementation with senior technical leadership.
Does every iOS product need SwiftUI?
No. SwiftUI is often the right choice for new interfaces and gradual modernisation, but the answer depends on the product, supported iOS versions, existing UIKit code, and the team.
Can he take over an existing iOS codebase?
Yes. I usually begin with a short product and technical assessment so everyone knows what to keep, repair, modernise, or replace.
Where does Clément work?
I am based in Lille, France, and work remotely with teams across France, Europe, the UK, the US, and other international markets.
Bring the product.
Start with the problem.
Tell me about the product, the team, and what is getting in the way. We will use the first conversation to see whether I am the right fit and agree on a useful next step.
Discuss your project