Daniel Antunes Rocha · independent mobile engineer

I help founders build and ship mobile apps with confidence.

Work directly with me on React Native and Expo apps — from an AI-built prototype to iOS and Android releases. Scope and timing are agreed upfront.

Discuss your app

React Native
Expo
iOS & Android
Firebase

AI-built app

Choose one journey or risk to check.

Built with AI. What next?

AI-built appChoose one journey or risk to check.

Questions before your next step

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About this service

Whether you are preparing to invite users or already seeing problems in use, I review one priority user journey or technical risk. You get written findings, clear next steps and a 30-minute call.

Can someone complete the main action?
I trace one agreed journey and look for the point where real users may get stuck.
What could fail on a phone?
I check the relevant setup and evidence for the issue you want to investigate.
What should happen next?
I rank findings by user impact and explain what to fix, test or defer.

Build an app

Plan your first version.

Your idea. A first release.

Plan your first version

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About this service

Start with a focused iOS and Android product plan, then develop it in defined, separately quoted stages with direct technical ownership.

What belongs in version one?
I map the main user journey and defer features that do not prove the product.
Where can the app fail on a real device?
I plan permissions, offline behaviour, API boundaries and platform differences early.
Who owns the result?
You keep the code, accounts, build process and decisions needed to continue after launch.

Audit & recovery

Find the pattern behind the failure.

The same bug. Again.

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About this service

A senior technical audit for unstable codebases, blocked releases, repeated regressions or apps that have become difficult to change.

Why does the same bug return?
I reproduce the failure and trace the state or integration that creates it.
Is a dependency blocking releases?
I compare native packages, build configuration and upgrade paths on both platforms.
What should be fixed first?
I rank issues by user impact, release risk and effort, then define a realistic recovery sequence.

Push notifications

Tap the notification, then explore the journey.

Push journey

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About this service

Find where delivery, permissions, deep links or tracking fail across iOS and Android, then scope the right fix.

Was the message delivered?
I follow token registration, provider response and device permission state; an accepted send is not proof of delivery.
Did the tap reach the right screen?
I test foreground, background and terminated states with the actual payload and deep link.
Did the notification create value?
I connect opens to in-app actions so the team can distinguish delivery from outcome.

Store launch

Explore the checks behind a store launch.

Apps

Store launch

Fix one agreed release blocker

Platforms: iOS + Android
Scope: One blocker

Preview

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About this service

A focused sprint for one agreed build, signing, subscription or review problem, with checks and a repeatable handover.

Can the team reproduce the build?
I verify signing, profiles, environment values and the path from source code to store build.
Will review block the launch?
I inspect permissions, privacy disclosures, purchases and store metadata before submission.
What happens at the next release?
I document the process and make the next version less dependent on one person.

Technical partner

Explore planned monthly mobile work.

Monthly mobile work

Which work moves the product?

We choose monthly outcomes from the roadmap instead of accumulating unrelated tickets.

Agree priorities
Work directly
Improve the system

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About this service

A limited monthly partnership for founders who need steady technical progress, sound decisions and someone accountable for mobile quality.

Which work moves the product?
We choose monthly outcomes from the roadmap instead of accumulating unrelated tickets.
Who handles the difficult mobile decisions?
I take direct responsibility for architecture, native behaviour and release trade-offs.
How does the team keep momentum?
Decisions, code and release steps stay visible so internal and AI-assisted work can continue safely.

Explore the service screens. Tap a topic or swipe between services.

Mobile engineering for real users, at scale.

I have contributed to builds and releases for a mobile product with 500,000+ monthly active users.

I am Daniel, a senior mobile engineer in Lisbon. I work directly with founders on React Native and Expo apps.

I started learning to program in 2011 and began working on software projects in 2015. My early work included educational software and leading a software team.

More about Daniel ↗

Daniel Antunes RochaSenior mobile engineer · Lisbon, PortugalView my LinkedIn ↗

2015
First software for a campus service
I built a PHP application for a student and staff health-assessment workflow, connecting forms, data and practical decisions.
2019–2020
First React Native product work
I began building mobile applications with React Native in sports and leisure, with later exposure to the commercial and marketing side of that business.
2020–2021
Mobile releases in compliance software
At a Brazilian provider of sustainability and legal-compliance software used across industries, I handled iOS and Android store work alongside React, Node.js, CI and microservice integrations.
2025–today
Mobile engineering in telecommunications
My principal role is mobile development for a large European telecommunications product. I offer selected independent work outside that role, with a defined scope and schedule.

Defined ways to work together

Know the scope, delivery and fee before we begin.

Each package covers a specific outcome. I schedule independent work around my existing role and confirm the start date before accepting a project.

01 / one-off€279

Reality Check

A founder with one React Native or Expo codebase and a specific product or release concern.

Scope: One repository and one priority user journey or technical risk.

Scope and delivery details

Timing: Within 5 business days after access and scope are agreed
You receive: Written risk assessment · Prioritised next-step list with recommended scope
Not included: Implementation, a full security audit, penetration testing and review of unrelated app areas.

Discuss this package ↗

02 / one-off€490

Build Blueprint

A founder with a mobile product idea who needs a credible first release plan.

Scope: One product concept and its primary user journey.

Scope and delivery details

Timing: Within 7 business days after the brief and access are complete
You receive: Version-one scope and deferred features · Architecture outline · Prioritised milestone plan and implementation estimate
Not included: Visual design, app development, user research and a guaranteed store approval.

Discuss this package ↗

03 / one-off€1,200

Finish & Ship Sprint

A team with an existing app and one defined blocker or release outcome.

Scope: One agreed technical outcome in the existing React Native or Expo project; exact acceptance criteria are written before work starts.

Scope and delivery details

Timing: Usually 2–3 calendar weeks after a start date is agreed
You receive: Code or configuration changes in the client repository · Verification notes and release instructions
Not included: A complete app build, major backend rebuild, 24/7 incident response and third-party or store fees. Larger work is quoted as separate milestones.

Discuss this package ↗

04 / per month€1,400/month

Mobile Technical Partner

A small team with an active mobile roadmap and recurring senior engineering needs.

Scope: Four reserved work blocks each month for agreed priorities in one product.

Scope and delivery details

Timing: Four planned work blocks per month, scheduled together in advance
You receive: Visible code reviews, changes or decisions tied to the agreed priorities · Monthly summary and next-priority recommendation
Not included: Unlimited requests, emergency on-call support, unplanned same-day response and work outside the reserved blocks.

Discuss this package ↗

Fees apply to the listed scope. A written proposal confirms acceptance criteria, schedule and any applicable tax. Larger builds are split into separately quoted milestones.

A useful first conversation

Tell me where the app is today.

I will reply personally with an honest view of the most useful next step. If there is a fit, we can schedule a short call.

Selected projects · Europe and remote

Contact through an AI assistant

With your permission, a connected AI assistant can send these same details for you and get the next step back.

See how AI contact works ↗

Opens Tawk.to when you choose it. Privacy details.

I help founders build and ship mobile apps with confidence.

AI-built app

Built with AI. What next?

Can someone complete the main action?

What could fail on a phone?

What should happen next?

How Daniel helps

Build an app

Your idea. A first release.

What belongs in version one?

Where can the app fail on a real device?

Who owns the result?

How Daniel helps

Audit & recovery

The same bug. Again.

Why does the same bug return?

Is a dependency blocking releases?

What should be fixed first?

How Daniel helps

Push notifications

Push journey

Was the message delivered?

Did the tap reach the right screen?

Did the notification create value?

How Daniel helps

Store launch

Store launch

Can the team reproduce the build?

Will review block the launch?

What happens at the next release?

How Daniel helps

Technical partner

Which work moves the product?

Who handles the difficult mobile decisions?

How does the team keep momentum?

How Daniel helps

Mobile engineering for real users, at scale.

First software for a campus service

First React Native product work

Mobile releases in compliance software

Mobile engineering in telecommunications

Know the scope, delivery and fee before we begin.

Reality Check

Build Blueprint

Finish & Ship Sprint

Mobile Technical Partner

Tell me where the app is today.