Web & mobile testing
End-to-end manual and exploratory testing across devices, operating systems and browsers.
- iOS
- Android
- Chrome
- Safari
- Firefox
Freelance QA Engineer
I break your app before your users do.
Manual QA for web apps, mobile apps and eLearning. Based in Colombia, working in your time zone, fluent in English and Spanish.
Top Rated on Upwork
BUG-404✓ QA
Users found a bug
→ Won't happen
- on Upwork
- Top Ratedon Upwork
- earned on Upwork
- $40K+earned on Upwork
- Upwork jobs
- 11Upwork jobs
- average client rating
- 4.9★average client rating
- native in both
- EN / ESnative in both
Services
What I test
Test cases & bug tracking
Clear test plans and reproducible bug reports that developers can act on right away.
- Jira
- Linear
- GitHub
- Trello
eLearning & Spanish QA
Module-by-module review of courses and interactive content, plus Spanish script and localization review.
- Modules
- Interactions
- EN → ES
Data-driven QA
Using product analytics to find where real users get stuck, then testing those paths first.
- Amplitude
- Funnels
- User paths
Selected work
Recent engagements
Client names are kept private. Each one is real Upwork work.
CASE-01Long-term · 16 months
Manual QA & customer support for a web product
Release testing, bug reporting and frontline support, so issues customers hit were reproduced and fixed fast.
CASE-02eLearning · ongoing
QA for 7 eLearning modules and advanced interactive content
Checking every screen, interaction and branch of each module before it reaches learners.
CASE-03Payments
Colombian payment methods on a live website
Testing the checkout flow with local Colombian payment options, end to end.
TEARDOWN-01Coming soon
Public QA teardown
A full QA pass on a well-known app, with test cases and bug reports you can read in full.
How I work
Boring releases, on purpose
- STEP 1/4
Learn the product
I use your app like a real user and read the specs before testing anything.
- STEP 2/4
Plan the tests
Test cases in your tracker, prioritized by risk.
- STEP 3/4
Break things
Every bug gets steps to reproduce, expected vs. actual, and evidence.
- STEP 4/4
Verify the fix
I retest every fix and run regression checks before you ship.
Reviews
What clients say
★★★★★
“Juan did a great job on this project. He always replied quickly and met every deadline, going above and beyond. He paid close attention to details improving the quality of the product and made sure customers were helped in the right way. His work was clear and well organized. I would be happy to work with him again in the future.”
★★★★★
“Great to work with. He knows testing very well and works efficiently.”
Contact
Let's make your next release boring.
Tell me about your product and what's worrying you before launch. I usually reply within a day.