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~/szymon % git log --graph --author="Szymon Klimaszewski"

SzymonKlimaszewski

Android tech lead, ex-Dropbox — monetization, SDKs, AI-agent tooling. Running my own apps since 2011. Available now.

Racibórz, Poland · PL · EN · DE

~/szymon % git log --oneline --all

The wide shot

16
years shipping software
15M
downloads of Blood Pressure
15
years of my own apps
6
companies
  1. e0cfbe82026(HEAD → next-role) feat: ??? (your team here)
  2. e7d55922023Android tech lead, monetization, Dropbox
  3. efaa97b2020Android developer, de facto team lead, UNUM
  4. 9e593792018feat: ship on the App Store
  5. 0a5cf852016Android developer, one of the first three on the team, Ryanair
  6. eb88b6f2015Senior software engineering specialist, BLStream
  7. 23374b42013Software engineering specialist, BLStream
  8. f2a87b12011feat: ship Blood Pressure (My Heart)
  9. baa50cc2011Junior software engineer, Tieto
  10. b2ea63d2010Computer graphics interface developer, Wytwórnia Filmów Fabularnych
  11. aaf1a8d2007Telephone consultant, then VBA developer, Teleperformance · PSB Mrówka
  12. 16b1d372006Automatics and robotics, software development; MSc in 2011, Wrocław University of Technology
  • PL · EN · DE

Email meLinkedIn ↗GitHub ↗

README.mdmain · 4a07a0a
Szymon Klimaszewski

Hi, I'm Szymon

I've taken mobile apps from a blank project to millions of users — Android professionally, iOS on the side, 15 years of both. I care most about the product and the team around it; the tech follows.

Based in Racibórz, after 16 years of studying and working in Wrocław. Husband, dad of two, and since 2026 a Lagotto Romagnolo owner.

Now

  • Looking for my next role: Android lead or senior engineer in monetization, mobile SDKs or AI-agent tooling. Available now
  • Wiring up AI agents (Claude Code, Codex, MCP) to do real engineering work, not demos
  • Shipping and maintaining my own apps on the side

How I work

product
Build things people keep using, not just things that ship.
tech
Pick the approach that still holds up in three years.
ux
A great experience is the one feature every user notices.
business
Good monetization earns trust along with revenue.
people
Share what you learn. Good teams compound.

Also

  • Ran an iOS basics training for 11 developers at Comarch in 2020 · course code ↗

git log --graph

Career

From HEAD back to where it started.

  • main career
  • indie/apps side project
  • next-role open to work

  1. commit e0cfbe8 (HEAD → next-role)

    Now · Remote (EU or US timezones) or hybrid near Katowice, Kraków, Wrocław · on next-role

    Your company?

    Android tech lead or senior engineer: monetization, mobile SDKs, AI-agent tooling

    feat: ??? (your team here)

    • Available now.
    • Monetization is what I know best: subscriptions, paywalls and pricing experiments at Dropbox, plus 15 years of the same in my own apps.
    • Experienced working with US-based companies across North American timezones (e.g. UNUM).
    • Also a strong fit for mobile SDKs or AI-agent tooling — I like building things other engineers rely on.
    Email me

  2. commit e7d5592

    Nov 2023 – Jan 2027 · on main

    Dropbox

    Android tech lead, monetization

    feat: lead Android monetization

    • Ran the team behind monetization in the Dropbox Android app: subscription flows, paywalls, pricing experiments.
    • Kept revenue safe during service disruptions — worked across PMs, EMs and stakeholders to fix things fast.
    • Built AI-agent tooling so the team could offload real tasks — reviews, investigations, test runs — to agents.
    Dropbox on Google Play
    • life 2026 A Lagotto Romagnolo puppy joined us

  3. commit efaa97b

    Jun 2020 – Jul 2023 · Remote, US startup · on main

    UNUM

    Android developer, de facto team lead

    feat: build UNUM's Android app from zero

    • Started UNUM's Android app from the first commit — a three-person team building a social-media planning tool for creators and brands.
    • Ran the Android side day to day, fully remote with the US-based company.
    unum.la
    • life 2021 Our daughter was born
    • life 2022 Moved back home to Racibórz

  4. commit 9e59379

    Mar 2017 – Nov 2018 · on indie/apps

    Side project

    iOS versions in Swift and SwiftUI

    feat: ship on the App Store

    • Eight (2017), Diabetes ++ (Apr 2018), Health+ Weight (Oct 2018) and Blood Pressure: Health+ (Nov 2018).

  5. commit 0a5cf85

    Jul 2016 – Jun 2020 · Wrocław · on main

    Ryanair

    Android developer, one of the first three on the team

    feat: grow Android at Ryanair from 3 to 11 people

    • Joined as one of the first three Android developers; we went on to drive every change in the app and grew the team to 11.
    • Led many architectural shifts in the main Ryanair Android app, now at 50M+ downloads on Google Play.
    • Built internal apps from scratch, including a communication app for cabin crew and a mystery-passenger app for rating staff.
    Ryanair on Google Play
    • life 2018 Became a dad: our son was born

  6. commit eb88b6f

    Aug 2015 – Jul 2016 · Wrocław · on main

    BLStream

    Senior software engineering specialist

    refactor: promoted to senior

    • Picked up the trickiest bugs and the deepest architectural work, and started mentoring juniors.

  7. commit 23374b4

    Feb 2013 – Jul 2015 · Wrocław · on main

    BLStream

    Software engineering specialist

    feat: secure enterprise browser and email on Android

    • Android developer on an all-in-one secure browser with a built-in secure email client, built for a global security company's enterprise and government customers.
    • A complex codebase with a native JNI communication layer migrated from Palm OS; BLStream's most important project at the time.
    • life 2014 Got married

  8. commit f2a87b1

    Jul 2011 – present · on indie/apps

    Side project

    Sole proprietorship, alongside full-time work

    feat: ship Blood Pressure (My Heart)

    • Blood Pressure (My Heart) went live on Google Play in July 2011. The aim was simple: the best blood pressure tracker on the market.
    • It has since passed 15 million downloads and is rated 4.3 by more than 56,000 people. Diabetes and Fertility Calendar followed.
    Blood Pressure on Google Play

  9. commit baa50cc (tag: MSc)

    Jun 2011 – Jan 2013 · on main

    Tieto

    Junior software engineer

    feat: software for a major telecom

    • Developed software for one of the biggest telecommunications providers.

  10. commit b2ea63d

    Jul 2010 – Mar 2011 · Film studio, Wrocław · on main

    Wytwórnia Filmów Fabularnych

    Computer graphics interface developer

    feat: teach studio cameras to fly

    • C++ interface for a motion-control camera system.
    • Kinematics calculations for the rig.
    • MEL tools for designing studio camera motion paths.

  11. commit aaf1a8d

    Summers 2007 – 2008 · on main

    Teleperformance · PSB Mrówka

    Telephone consultant, then VBA developer

    chore: first paychecks

    • Ran phone polls with randomly selected people across Poland.
    • Built a product database and margin optimization in VBA.

  12. commit 16b1d37

    2006 – 2011 · Wrocław · on main

    Wrocław University of Technology

    Automatics and robotics, software development; MSc in 2011

    init: start automatics and robotics

    • life 2006 Moved from Racibórz to Wrocław

indie/apps · releases

Apps I build on my own

A side branch that has been running since 2011: health and fitness apps on Google Play and the App Store, designed, built, monetized and supported by me.

  1. v7.7.0since 2011

    Blood Pressure

    My Heart on Android · Blood Pressure: Health+ on iOS

    Blood pressure diary with charts, PDF reports and guided breathing exercises.

    downloads
    15M
    Google Play · 56.8K
    4.3 ★
    App Store · 3.9K
    4.5 ★

  2. v5.1.5since 2013

    Diabetes

    Blood Sugar Tracker on Android · Diabetes ++ on iOS

    Blood sugar and glucose tracker: logbook, charts, tags and PDF export.

    downloads
    500K+
    Google Play · 10.4K
    4.4 ★
    App Store · 155
    4.6 ★

  3. v2.00.03since 2013

    Fertility Calendar

    Ovulation, period and fertility calendar.

    downloads
    100K+
    Google Play · 364
    3.7 ★

  4. v1.1since 2018

    Health+ Weight

    Weight tracking with interactive graphs and PDF reports, for iPhone.

  5. v1.2since 2017

    Eight

    8 Minute Workout Challenge

    A daily eight-minute workout challenge for iPhone.

archived: 8 Minute Legs · Workout Log · Soundible

dependencies

Skills

AGENTS.mdhow I work with AI

## Daily drivers

  • Claude Code
  • OpenAI Codex

## How I work with them

  • Custom Skills and slash commands, refined from real failures — not templates
  • MCP integrations that plug agents into the team's docs, tickets, chat and live data
  • Parallel agents for investigations and reviews; a supervising agent pulls the threads together
  • End-to-end browser and Android device automation
  • Background agents that watch CI and PRs, then pick up the next step on their own
  • Context engineering: persistent instructions that travel across assistants and hold up in a fresh session
  • Every agent output checked against code, docs and logs before it ships

## Things I've built

  • An orchestration layer where Codex and Claude Code tackle the same problem from different angles
  • Mobile-testing agents that run on real devices the way a human QA would
  • Developer-workflow Skills — the glue between agents and the tools a team already uses

## On my own apps

  • 34 Google Play and 32 App Store localizations, done by a pipeline of research → write → verify agents
  • ASO Skills: keyword research, listing generation, keyword-density checks, screenshot title variants
build.gradle.kts
dependencies {
    // languages
    implementation("Kotlin")  // daily driver
    implementation("Java")
    implementation("Swift")
    implementation("C++")  // since the film studio

    // mobile
    implementation("Android SDK")
    implementation("Jetpack Compose")
    implementation("Kotlin Multiplatform")
    implementation("SwiftUI")

    // ai
    implementation("Claude Code")
    implementation("OpenAI Codex")
    implementation("MCP integrations")
    implementation("Skills and slash commands")
    implementation("Multi-agent orchestration")
    implementation("Context engineering")

    // product
    implementation("AdMob and Play Billing")  // smart monetization
    implementation("Tech leadership")
    implementation("Mentoring")
}
res/spoken languages
  • values-pl/strings.xmlPolish · native
  • values/strings.xmlEnglish · professional working
  • values-de/strings.xmlGerman · limited working

git push origin hello

Open a pull request.

Hiring an Android lead for monetization, SDKs or AI-agent tooling? I'm available now. Write to me and I'll get back to you quickly.

Email meLinkedIn GitHub 
$ git remote -v
email    szymon@klimaszewski.mobi
linkedin linkedin.com/in/klimaszewski-mobi
github   github.com/SzyQ