Based in Israel

I make releases boring.

I'm Uzi Cohen, a QA engineer with 5 years of full-cycle testing across web, API, iOS and Android, from test plans to release sign-off.

Get in touch See projects

regression · pipeline #4817

$ mvn test -Dsuite=regression -Dthreads=4

sdk.impression_fires_exactly_oncerunning
rewarded.endcard_after_video_complete
api.partner_bid_response_schema
visual.feed_phash_within_threshold
banner.refresh_respects_remote_config
api.auth_rejects_expired_token
android.consent_choice_persists
web.checkout_smoke_playwright

0/8 testsgate: pending

Example regression run. One flaky test is isolated, retried and recovered.

years of full-cycle QA

Web, API, iOS and Android, from test plans to release sign-off

1B+

devices run the SDK I tested

Digital Turbine's mobile SDK on iOS and Android, through to release sign-off

300+

manual and automated tests

Mobile Research Labs, across mobile and web, documented in STP/STD

20+

security findings

OWASP Top 10 assessment: IDOR, auth bypass and injection, all fixed by development

About

I've spent five years making releases boring. At Mobile Research Labs I led a 3-person QA team and built the iOS, Android and web automation from scratch. At Digital Turbine I ran full-cycle QA for a mobile SDK installed on over 1 billion devices, first through Qualitest and then as a direct hire. I work in Hebrew, English and Arabic, and next I want to own quality for a mobile or API product where tests are part of how the team ships.

Two pieces of work from my last two jobs, plus the two test patterns I write every day. Each animation shows how it behaves when it runs.

baseline

xor

candidate

hamming distance 0 / threshold 10visual match

Visual regression tool

Pixel-by-pixel screenshot diffs failed on every anti-aliasing change. I built this Java tool with AI coding tools: it compares perceptual hashes instead, which reduced flaky failures in the screenshot tests.

Read how it works

Java
pHash
Hamming distance

> GET /search?q=' OR '1'='1

criticalSQL injection→ remediated

OWASP Top 10 assessment

A security pass over the API and web surfaces found 20+ issues, including IDOR, auth bypass and injection. I stayed with development until each one was fixed.

OWASP
API
Charles Proxy

TODAY, SUNDAY

Push, 33 min

1. DB Bench Press

3 x 8-15, rest 90 sec

Start set

2. DB Shoulder Press

3 x 8-15, rest 90 sec

Start set

3. Push-ups

3 x 8-20, rest 60 sec

Start set

Finish workout

DB Bench Press, set 1

Reps

Save set

HomeBulkSmokeTest.java

find(accessibilityId("start-set-bench")).click();
find(accessibilityId("reps-input")).sendKeys("12");
find(accessibilityId("save-set")).click();
swipe(Direction.UP);
assertTrue(find(text("Push-ups")).isDisplayed());

Mobile automation, end to end

An Appium test driving a real flow: find each element, tap, type, swipe, then assert. Shown on a demo of HomeBulk, my gym app.

Appium
Java
Android

SessionApiTest.createSession_returnsValidToken

test

POST /sessions

api

POST /sessions

statusCode() == 201
body matches session.schema.json
body("expiresIn") == 3600
time() < 500ms

API tests that check the contract

Request out, response back, then every assertion: status, JSON schema, fields and response time. The same pattern I use with REST Assured and Postman.

REST Assured
Postman
JSON Schema

My map editor, plus nine more picks from GitHub chosen for relevance and difficulty: test suites and apps I built end to end.

Featured build

Uzi's Map Editor

A Windows desktop editor for Old School RuneScape maps, branded as GadScape map tools. It loads the game cache, renders regions in 3D, and lets you place and delete objects, then export the edited regions.

3D world renderer and top-down map, both drawn with OpenGL
Place and delete tools, an object picker and region export
Three UI themes: OSRS, Aurora and Midnight
Ships as a Windows app that updates itself from GitHub Releases

Download for Windows

Parking app E2E tests
parking-app-e2e-tests, 2026
UI tests, a test plan and 8 reproduced bugs for a parking-management web app running in Docker, built on the Page Object Model.
PlaywrightTypeScriptDocker
Web shop E2E tests
Webshop-e2e-tests, 2026
UI and API tests for a demo web shop, with WireMock stubs and a Page Object plus component model.
Java 17Selenium 4TestNGMavenWireMock
Wheel API tests
wheel-api-tests, 2026
API tests for a mobile game's backend: login, prize-wheel spin, balances and rejected requests, run in GitHub Actions.
Playwright TestTypeScriptGitHub Actions
Travel policy UI tests
travel-policy-ui-tests, 2026
UI automation for a travel-insurance policy purchase flow, with a shared base test setup.
JavaSeleniumMaven
PolyTrader
polytrader, 2026
A risk-first Polymarket trading system fed by government-contract and STOCK Act disclosure data. One deterministic risk engine gates every trade.
PythonLLM
PreSwiper
PreSwiper, 2026
Swipe-based prediction-market analyst: a mobile feed, portfolio, leaderboard and auto-trader in one monorepo.
React NativeNext.jsPrismaTypeScript
HomeBulk
HomeBulk, 2026
Home workout app that builds a push/pull/legs program from the equipment you own and tells you what to do today.
TypeScript
Android TV movie browser
androidtv2q, 2026
Leanback Android TV app for browsing TMDB movies and shows, with search, detail pages and playback.
KotlinAndroid TV
Fashion Content Studio
dad-app, 2026
Turns dress product photos into short promo videos for Reels and TikTok, with templates, watermarks and multiple AI video providers.
TypeScriptRunwayFal.aiReplicate

Digital Turbine

QA Engineer

May 2024 - June 2026 · Petah Tikva

Nasdaq-listed (APPS) mobile company headquartered in Austin, Texas. Its Petah Tikva R&D center came with the 2021 Fyber acquisition and builds DT Exchange and its mobile SDK.

Via Qualitest until August 2025, then hired directly.

Full-cycle QA for a mobile SDK installed on over 1 billion iOS and Android devices.

Ran full-cycle QA for the SDK: test scopes, STPs, STDs, manual test cases, regression, defect tracking in Jira and release sign-off.
Owned testing end to end for native ads through production release, finding 5+ critical defects before launch.
Maintained the automated test suite: investigated and fixed failing and flaky tests, and trained a new tester to write tests in the framework.
Built a visual regression tool in Java with AI coding tools, which reduced flaky failures in screenshot tests.
Tested APIs and UI with Postman, REST Assured and Charles Proxy: event tracking, payload validation and live traffic inspection.
Through Qualitest, part-time: tested the Israel Electric Corporation (IEC) AI chatbot with test cases and conversation flows.

Java
Appium
TestNG
Postman
REST Assured
Charles Proxy
Jira
GitLab CI

Mobile Research Labs

QA Engineer

September 2021 - May 2024 · Hod Hasharon

Audio technology: a sound-level (dB) measurement SDK used mainly by factories.

Led QA for iOS, Android and web, from test plans to release readiness.

Led a 3-person QA team: priorities, test plan review and release readiness.
Designed and built the iOS, Android and web automation framework from scratch in Java (Appium, Selenium, TestNG).
Wrote and ran 300+ manual and automated tests across mobile and web, documented in STP/STD, with defects tracked in Jira and Azure DevOps.
Validated backend-to-frontend data integrity by querying AWS DynamoDB and cross-checking against the live production web UI.
Led an OWASP Top 10 assessment of the API and web, finding 20+ vulnerabilities including IDOR, auth bypass and injection, all fixed by development.

Java
Appium
Selenium
TestNG
AWS DynamoDB
Azure DevOps
OWASP

QA full cycle

Test planning, Test strategy, STP/STD, Manual testing, Exploratory, Regression, Smoke, Defect lifecycle, Release sign-off, Agile/Scrum

Automation

Selenium, Appium, Appium Studio, Appium Inspector, Playwright, TestNG, JUnit, REST Assured, Page Object Model, Visual Regression

API and data

API testing, Swagger, Postman, Charles Proxy, JSON, AWS DynamoDB, SQL

Programming

Java, TypeScript, Python, SQL

CI/CD and tools

GitLab CI/CD, GitHub Actions, Jenkins, Git, GitHub, Docker, Linux, Jira, Azure DevOps

Platforms and AI

Web, iOS, Android, Mobile SDK, Cross-browser, Claude Code, Cursor, AI chatbot testing

2021
QA Automation: Selenium and Appium
Atid Automation
2021
QA Engineering Certification
Atid Automation
2022
Full-Stack Web Development
Developers Institute

When I'm not chasing flaky tests, I'm in goal, watching Bayern, or sailing the seas of Gielinor.

Football

Goalkeeper

Sweeper-keeper.

I play in goal every week, sweeper-keeper style. Manuel Neuer has always been my idol.

FC Bayern Munich

Mia san mia.

Dortmund1:2Bayern

25 May 2013 Champions League final. Robben scores in the 89th minute.

Seahawks fans unfurling a giant 12th Man jersey in the stadium

Seattle Seahawks

Go Hawks.

4TH QUARTER

Seahawks14Rams30

December 2025 Down 16 in the fourth. Won in overtime on a two-point conversion, Darnold to Saubert, the first overtime game ever won that way.

Movies and TV

Sitcoms on repeat

Friends, How I Met Your Mother, and anything else with a laugh track.

Movie nights

Star Wars (Episodes I to VI, Rogue One and Andor), The Lord of the Rings and The Hobbit. Tap the screen to skip.

Fighter jets

Israeli Air Force

I always dreamt of being a fighter pilot.

F-35I Adir
Adir, 'Mighty'
In May 2018 the IAF announced the first operational F-35 strikes anywhere in the world.
F-16I Sufa
Sufa, 'Storm'
Two-seat Israeli variant with conformal fuel tanks. Before it came the Netz and the Barak.
F-15I Ra'am
Ra'am, 'Thunder'
Israel's Strike Eagle, flown by 69 Squadron, The Hammers. The earlier F-15s were called Baz.
IAI Lavi
Lavi, 'Lion'
Israel's own fighter. First flight on 31 December 1986, cancelled by a 12 to 11 cabinet vote in August 1987.