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I’ll suggest how to improve your product’s quality and avoid post-release issues.
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Let's make sure it works like it.
Are you building something great?
Your developers build it. We make sure it works for every user, on every screen, without surprises.
Which scenario do you prefer?
Which scenario do you prefer?
SCENARIO 1
No QA
Released the product without testing. It glitches, reviews are bad, users are leaving.
No money, reputation suffers. Investors flee, startup sinks.
No money, reputation suffers. Investors flee, startup sinks.
SCENARIO 2
QA after release
QA after release
You launched, then things broke down. Now you’re fixing bugs at 10x the cost, losing investor trust, and gaining a few gray hairs along the way.
SCENARIO 3
QA before and after release
QA before and after release
Tested the product. Fixed bugs. Investors impressed. Launched with five-star reviews and cash flow. Tested new features. Growth, profit... Google feels your breath.
Are you choosing SCENARIO 3? Then we're on the same page
Let's get acquainted
Would you like to see the certificates?
My name is Olha Arkusha
I’m patient, structured, and very human.
I'm the founder of the Ukrainian startup Qoolli, and also...
Author of the Telegram channel Software Testing for beginner testers
Worked in the following areas: PropTech, TravelTech, MobilityTech, FinTech, Payment System Testing, HealthTech, GiftTech, FoodTech, SportTech, Cloud services administration (Google Workspace, Jira, Slack)
Tested software for the Dutch Ministry of Foreign Affairs
ISTQB-certified tester with 8 years of experience
Me and my team protect your money, reputation, and users with thorough product testing – whether it’s a website, mobile app, AI solution, SaaS product, or separate components.
To keep things simple, we’ve highlighted two main types of testing
Tell us about your task – we’ll help you figure out what fits.
Post-release testing
We will provide a quote for your specific case after reviewing the task.
Wondering about the cost?
Get 30% off your first order. Repeat orders are even better - 40% off!
Big Discounts
Your software gets tested with in 48 hours after your order.
Fast Start
A test plan detailing what, how, and how long to test usually costs €720. You get it for free.
Free Test Plan
We test software on real devices. We catch bugs that are not visible on simulators.
Real Devices
I personally supervise the quality of work. Your product is protected by my experience.
Olha’s Oversight
We join at any stage - from MVP to release and beyond. We're there when you need us.
QA on Demand
Here’s what you get with Qoolli
Only 4 spots left
Special offer for the first 4 customers!
Your discount on your order is 55% instead of 30%
Your discount on your order is 55% instead of 30%
Real value examples from QA projects
Here are three real-life examples of how proper quality assurance saved a project from closure and helped attract customers and major investors. These examples are taken from different industries - HRTech, HealthTech, and TravelTech - and clearly demonstrate the importance of quality assurance for products and businesses.
What was done:
The work you do while you procrastinate is probably the work you should be doing for the rest of your life.
Result: Operational group decided to continue the project rather than shut it down
Task: Conduct integration testing of the HR system with more than 15 external systems
Client: Government organisation (Europe)
The overall functionality of the system was tested, covering more than 100 countries with different languages and laws
A critical bug was detected during data transfer: only half of the salary table was transferred from two systems – the error was detected thanks to a manual check of 150 values
A general overview of the system was compiled without the product owner, who knows everything about it
A critical bug was detected during data transfer: only half of the salary table was transferred from two systems – the error was detected thanks to a manual check of 150 values
A general overview of the system was compiled without the product owner, who knows everything about it
What was done:
From bugs to investments: the story of a social platform
Custom branding logic per hospital (theme, color, assets)
Regression and visual consistency testing across brands
Fixed bugs with time zones that prevented users from receiving help at the right time.
Regression and visual consistency testing across brands
Fixed bugs with time zones that prevented users from receiving help at the right time.
Result: The startup founder successfully launched the product and attracted investors from a network of hospitals
Task: Launch a website and app for people with disabilities, eliminate bugs, and stabilize key functions
Client: Social digital platform for helping seriously ill people (Australia)
What was done:
Venture investments protected by QA
Setup Google Hotel Ads for direct booking visibility and post-release testing with Google Analytics
Integration testing with channel managers to display availability and prices in real time
Testing of payment systems
Integration testing with channel managers to display availability and prices in real time
Testing of payment systems
Result: QA ensured a successful release and growth of the customer base
Task: Organize and perform testing of a web application from the initial phase to release in production and post-release testing.
Client: Venture-backed startup (Japan)
Olha worked in our team as a QA specialist and mentor. Thanks to her work, we released the product without any critical errors, which helped us avoid negative...
Tester in Onix-Systems
Viktor Bilyi
Words from my clients
Olha assisted our organization with testing a highly complex HR system integrated with more than 10 other data sources, both...
Info Manager, 3W Netherlands
Doortje Kerpershoek
Serhii Kholin
Olha worked at Onix-Systems for over 6 years as a QA Engineer. Starting as an intern, she grew to the level of Senior QA Engineer...
CEO at Onix-Systems
Serhii Kholin
CEO at Onix-Systems
CEO at Onix-Systems
Olha worked at Onix-Systems for over 6 years as a QA Engineer. Starting as an intern, she grew to the level of Senior QA Engineer. She participated in large projects from the planning stage of new features to setting up the testing process in teams with several QA engineers.
Olha contributed to the development of the QA department by creating materials on Test Management and Test Analytics. In addition, she was responsible for administering access to the cloud infrastructure, as she enjoyed the full trust of the company.
Olha contributed to the development of the QA department by creating materials on Test Management and Test Analytics. In addition, she was responsible for administering access to the cloud infrastructure, as she enjoyed the full trust of the company.
Doortje Kerpershoek
Info Manager, 3W Netherlands
Info Manager, 3W Netherlands
Olha assisted our organization with testing a highly complex HR system integrated with more than 10 other data sources, both within and outside our IV landscape. She independently configured and executed test cases while maintaining constant communication with the vendor, project team, and functional managers.
I got to know her as a loyal and reliable specialist who is a pleasure to work with. Olha has always proven herself to be a hard-working employee who loves to get to the heart of the matter and has a clear passion for her profession.
I got to know her as a loyal and reliable specialist who is a pleasure to work with. Olha has always proven herself to be a hard-working employee who loves to get to the heart of the matter and has a clear passion for her profession.
Viktor Bilyi
Tester in Onix-Systems
Tester in Onix-Systems
Olha worked in our team as a QA specialist and mentor. Thanks to her work, we released the product without any critical errors, which helped us avoid negative feedback from customers and unnecessary costs for urgent fixes. Olha's structured approach to testing had a positive impact on the overall quality of development.
Olha initiated the verification of edge cases that we had not considered, and the schemes she created simplified and accelerated the testing process. She is able to interact calmly with the team even under stressful conditions and always met deadlines, even when the scope of testing increased at the last minute.
Olha initiated the verification of edge cases that we had not considered, and the schemes she created simplified and accelerated the testing process. She is able to interact calmly with the team even under stressful conditions and always met deadlines, even when the scope of testing increased at the last minute.
How we work
Request + discovery call
Submit your request and we’ll hold a brief call to clarify goals, scope, and timeline.
Free test plan + contract
We draft a detailed test plan at no cost; once you approve it, we sign the contract and lock in the terms.
50 % advance payment
Pay a 50 % deposit to reserve the team and kick off work on the agreed dates.
Testing + report
We run the tests according to the plan and send you a full report with bug list, priorities, and recommendations.
Final 50 % payment
After you accept the report, you pay the remaining balance, receive all artifacts, and we stay available for support.
Questions you wanted to ask
There are at least three reasons for this. First, you may not have tested everything, in particular, you may have missed boundary values, integrations, and non-standard scenarios. Second, any new update can break what used to work. Third, users don't forgive mistakes, so testing is your protection against reputational damage and financial loss.
We don't just catch bugs - we look at the product through the eyes of the user. We provide feedback on logic, usability, design, speed, and clarity. This ensures that the product is not only error-free, but also enjoyable to use.
There is no such thing as complete testing, but it is possible to test enough to be confident. We define readiness criteria and cover key risks.
The testing time depends on the task.
Here are the approximate ranges:
Here are the approximate ranges:
- testing one feature - from 2 to 8 hours
- testing MVP - from 1 to 3 days
- full regression - from 3 to 10 days
- continuous support - from 1 day per week
Yes, absolutely.
We can test a specific feature, module, or new release, focus only on the web version, mobile app, or API, check only UX or only security.
You choose the coverage area yourself - we will offer the optimal scope.
We can test a specific feature, module, or new release, focus only on the web version, mobile app, or API, check only UX or only security.
You choose the coverage area yourself - we will offer the optimal scope.
Oh, and I also train QA testers
From zero to Junior level in 2 months. Free of charge.
Certificate at the end of the course. The best students will be invited to work for me!
I want to learn! Certificate at the end of the course. The best students will be invited to work for me!
Your product deserves peace of mind
info@qoolli.com
Let’s talk. I’ll look over what you’re building and suggest a Test Plan - free of charge.
Contact / Free Consultation
© 2025 Qoolli. All rights reserved.
Quality Assurance for digital products
Certified ISTQB QA engineer
with 8+ years of experience
Certified ISTQB QA engineer
with 8+ years of experience
info@qoolli.com
+31 64 486 1274
