Product definition
Clarify the user, problem, essential workflow, first release, and commercial constraints before expensive assumptions become code.
Mobile app development · From idea to production
Build an app that works beyond the demo.
I help founders and businesses shape, build, launch, and operate mobile products—with the product thinking, backend systems, cloud infrastructure, and technical judgment included.
Rafael Lima — senior software engineer, 10+ years shipping production software.
Working directly with founders and businesses across the US, Canada, and Europe.
Mobile product
Useful to people
APIClear foundations
DataReliable by design
CloudReady to operate
One accountable product partner
An app is a business system, not a collection of screens.
A credible mobile product needs a clear purpose, a focused user experience, dependable services behind it, and a plan for release and operation. I work across that complete system.
Mobile experience
Build a focused Android and/or iOS experience that makes the core job understandable, fast, and pleasant to complete.
Backend & integrations
Create the APIs, data model, authentication, payments, notifications, admin tools, and third-party connections the product requires.
Production & growth
Handle cloud deployment, observability, privacy, store release, iteration, and the technical foundations needed after launch.
Proof you can open on your phone
Apps I designed, built, and released myself.
Every product below is mine end to end: the idea, the interface, the backend, the privacy policy, the store release, and the support. It is the same work I would do for your product.
Available on Google Play
Bible Study: Learn & Play
Short, gentle Bible lessons with games, stories and prayers — with Ezra as your guide.
Available on Google Play
Jesus Color by Number
Color the life of Jesus, one Bible story at a time.
Available on Google Play
Bible Memory: Match & Discover
A calm memory game. Every finished board unlocks a moment from the life of Jesus.
Available on Google Play
Fruit of the Spirit Test
A gentle, private self-reflection on the nine fruit of the Spirit in Galatians 5:22-23.
Available on Google Play
Random Bible Chapter
One tap picks a random chapter from the whole Bible.
Coming soon to Google Play
Bible Story Wallpaper
One illustrated Bible story on your lock screen.
Android app
Bible Characters
Meet the people of the Bible, and play Who am I? with friends.
Published on Android
Guess the Word
Ask questions, follow the clues, and discover the hidden Bible word.
Available on Google Play
EverUsTogether
Remember the moments, habits, and experiences that bring people closer.
How the work moves
Reduce risk before adding complexity.
The process is structured enough to create momentum and flexible enough to respond when the product teaches us something new.
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01
Understand the opportunity
Define who the product serves, what problem matters, what success looks like, and which assumptions need evidence.
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02
Shape the first release
Choose the smallest coherent product that can deliver value, test the central idea, and establish a foundation for what follows.
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03
Design and build the system
Develop the mobile experience and everything behind it in working increments, with technical decisions made in the context of the business.
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04
Launch, learn, and improve
Release responsibly, observe real usage, fix friction, and evolve the product with better information than we had at the beginning.
Who you would be working with
I am Rafael, and I build the thing myself.
I am a senior software engineer and entrepreneur with more than ten years of experience taking products from early idea to running production systems. I do not hand you to a junior team: the person you speak to is the person making the technical decisions and writing the code.
- Mobile apps for Android and iOS, with the APIs, databases, and cloud infrastructure behind them.
- Large-scale data systems, PostgreSQL platforms, automation, and practical AI features.
- My own published apps, so I know what launch, store review, privacy, and support really involve.
- Clear, direct communication and honest advice, including when something should not be built yet.
Where I add the most value
A strong fit for products that need judgment.
I am most useful when the technical work is important, the requirements are not completely obvious, and someone needs to connect product decisions to production delivery.
Good reasons to involve me
- You have a valuable app idea but need help defining the right first version.
- Your existing app needs stronger architecture, reliability, or product direction.
- The product depends on APIs, data, AI, automation, or non-trivial integrations.
- You need senior technical leadership and someone who will still build.
- You value a longer-term product relationship over a one-off code handoff.
What you can expect
- Direct communication with the person making and implementing decisions.
- Clear trade-offs instead of unnecessary technical complexity.
- Working software delivered in visible, reviewable increments.
- Attention to privacy, security, performance, and maintainability.
- An honest view of risks, unknowns, and what should wait.
Common questions
Before we start a conversation.
Can you help if the app is still only an idea?
Yes. Early product definition is part of the work. I can help clarify the user, problem, first release, technical approach, risks, and what should not be built yet.
Do you only write the mobile application?
No. I can work across the complete product: mobile experience, backend, APIs, database, cloud infrastructure, integrations, analytics, release, and ongoing operation.
Can you improve an existing app?
Yes. I can assess an existing application, identify product and technical constraints, stabilize its foundations, rebuild specific areas, or lead a more substantial modernization.
What kinds of working relationships are the best fit?
I am best suited to meaningful product builds and ongoing technical partnerships where senior judgment and hands-on delivery both matter. Very small isolated tasks are usually not a strong fit.
Start with the problem
Tell me what the app needs to change.
A useful first email explains the user, the problem, what exists today, and why solving it matters. It does not need to be a finished specification.
Contact Rafael about your appNo sales team and no obligation. I read every project enquiry myself.