Quality assurance

Bugs don't wait, and neither should your testing. QA is built into 80% of the 200+ React, Next.js and Node.js projects we've delivered - manual testing for the business-logic bugs scripts miss, Playwright-driven automation for everything else, and security scanning built in as standard. Ship with confidence, faster.

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Our quality assurance offer

QA is built into roughly 80% of the 300+ projects we've delivered - not bolted on at the end. Black box testing sees your application from the user's point of view - real-world scenarios, edge cases, load - without touching the code. White box testing dives into the code itself, reviewing loops, conditions and execution paths. Some bugs only a human catches, which is why manual testing covers usability and design issues scripts miss. For everything else, Playwright-driven automation runs regression suites natively in your CI/CD pipeline. Security scanning is automated and OWASP-based, catching common vulnerabilities early - it's not a substitute for a dedicated penetration test, but it catches what usually slips through before one's ever needed. And our audits drill into your software's architecture, flagging inefficiencies with actionable fixes. Quality assurance isn't just about finding bugs - it's about delivering software that works, lasts, and holds up under real users.

Black box testing

Users are not interested in seeing your code, they are only interested in what works. This is why black box testing is essential as black-box testing lets the software see through the eyes of the users, and we do this by executing real-life scenarios on your system. These scenarios are important as they push the application beyond its normal working capacity under unusual conditions or situations. By doing so, the testers care less what is underneath the hood but focus on the functionality. They determine the performance of each button, form, and workflow, to ensure every button, form, and workflow behaves as intended. This method isn’t just about catching bugs; it’s about making sure your system aligns with business requirements, usability standards, and the seamless experience users expect.  We test how your app responds to valid and invalid inputs, how it handles errors, and whether it meets the logic it promises. And when something doesn’t add up? We pinpoint the issue before your users ever encounter it.

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White box testing

Clean code doesn’t guarantee flawless execution and this is where white-box testing comes into play. We throughly check your application and examine its structure, logic, and flow to find vulnerabilities and inefficiencies before they escalate into real problems. Each method is analyzed in light of every loop and every conditional - it is about all of it ensuring that your software is not only doing the job but doing it efficiently.  Performance matters to us, so we don’t just look for errors; we pinpoint bottlenecks, refine execution paths, and make sure your system runs as smoothly as possible. Security is another factor;  "weak" code spots can translate into massive liabilities in the future. With in-depth component-level verification, we fortify your software’s foundation, ensuring reliability and robustness in every build.

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Manual testing

Some issues fall through automation. Subtle bugs, clumsy UI problems, unexpected behaviors - things only a human tester will catch. That's why manual testing remains crucial. We go step by step, executing test cases with precision, uncovering problems that automated scripts will miss. Live feedback makes the process agile, allowing us to react instantly to design changes, functionality adjustments, or shifting requirements. It's not about clicking buttons; it's about understanding how real users will interact with your product. We make sure layouts are consistent, workflows are natural, and interactions are seamless - desktop, mobile, or something in between. Because, in the end, software is not just code. It's a user experience. And we make sure it's a good one.

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Automated testing

Repeated testing wastes time, period. Automated testing prevents that. We run our test suites on Playwright - we migrated off Selenium for faster, AI-assisted test recording and easier maintenance - so scripts scale and catch regressions before they stop your development cold. Every change, every commit, tested instantly and wired into your CI/CD pipeline. Stability matters, so we validate functionality across browsers, devices, and operating systems, not just one setup. And because automation is about accuracy as much as speed, our tests are repeatable, removing human error from the equation.

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Security checks

Security is not a simple checkbox on the list. It's an ongoing battle against evolving threats, and we're committed to it. Every QA engagement includes automated, OWASP-based security scanning to catch common vulnerabilities early, alongside manual review of authentication, data-handling and API flows. It won't replace a dedicated penetration test - but it catches what most often slips through before one is ever needed. APIs, databases, authentication flows-each level is reviewed, assessing risks that could lead to data breaches or unauthorized entry. Because when security is at stake, prevention beats the cure every time.

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Audits

A solid product starts with a solid foundation. Our audits scan deep into your code and infrastructure, uncovering inefficiencies that slow performance, introduce risk, or make maintenance a nightmare. Every function, every dependency, every architectural decision - we examine them all, ensuring your software is not just functioning, but functioning intelligently. Compliance is another essential aspect. We test compliance to industry security standards and regulation, so not only are you in compliance- but you're one step ahead of the competition. But an audit isn't just about identifying problems; it's about delivering solutions. Our comprehensive reports don't end at technical jargon, but provide you with simple, actionable advice on how to optimize, streamline, and future-proof your software. Quality is not a fix-thing - it's a constant commitment, and we see that you stay ahead.

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Quality assurance process

UI/UX Audit

usability testing / user interactions / accessibility requirements / Style Guide inconsistencies

Unit testing

prepping & reviewing the unit in question / making test cases & scripts / code testing

Regression testing

re-running tests / performance check after changes / functionality comparison

Pre-release

running functional tests / user flow analysis / stress testing

Post-release

post-release verification / report verification results / post-release monitoring

Having bugs in your product?

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UI/UX audit

Unit testing

Regression testing

Pre-release

Post-release

A UI/UX audit isn't a simple review - it's an exploration of the design of your product to find areas of friction and opportunity. We review the way users currently interact with your software, taking particular note of usability, accessibility, and consistency of the interface. With clickable prototypes, we simulate real user behavior to see first-hand how your interface acts in the wild. This helps us uncover not just what can confuse or frustrate users, but also how we can make the experience simpler to make it more intuitive, quicker, and smoother. Style guide inconsistencies are another place we thoroughly scrutinize, ensuring that your design language is unified across all screens and components. Our team does not just end with one review. Whether we're creating a new product or going over an existing one, we're constantly analyzing each phase of the development process. It's fine-tuning and making changes along the way to get your product as efficient and accessible as you can possibly get it to your target market.

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Latest QA audit projects

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Got a "buggy" application?

We are ready to conduct a QA audit and find the root cause of your problems. Let’s work together to improve your product.

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Ensuring a flawless user experience

Reducing risks and ensuring security

An ideal user experience is the foundation of every successful digital product, which is why QA is built into roughly 80% of the 300+ projects we deliver, not bolted on afterward. We test across a wide range of devices and browsers using a combination of black box and white box testing, catching functional defects and the small usability issues that quietly push users away if left unchecked.

Consistency is what keeps user trust, and that's where Playwright-driven regression testing does the heavy lifting - every new feature or update is tested against the existing product before it ships, so updates don't quietly break what already works. The goal is simple: a product that works as promised, so users stay engaged and come back.

Security and stability aren't optional for a production application. We don't just report bugs - every QA engagement includes automated, OWASP-based security scanning alongside manual review of authentication, data-handling and API flows, catching what most often slips through before a dedicated penetration test is ever needed. We also make sure your software meets the industry regulations relevant to your product, reducing the cost - financial and reputational - of non-compliance.

Performance is the other half of the equation. We catch bottlenecks early in development instead of after launch, when a fix means a crisis hotfix instead of a planned one. Combined with our automated regression suite, this keeps your app secure, optimized and up to date as it grows - so you can focus on the business, not firefighting.

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FAQ

What types of companies do we usually work with?

Are the QA consultations free?

What’s the standard length of the QA project?

How does the QA process look like?

Do you offer manual testing?

What team works on a QA process?

What happens if I am not satisfied at any of the steps of the QA process?

How much does a QA service cost?

What's the difference between black box and white box testing?

What's the difference between automates, integration and end to end tests?

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Our clients

They’ve already trusted us.

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Testimonials

The services DnD team has provided POSSIBLE have been of excellent quality of delivery - on time and budget. During the development process they are punctual and reliable, always focusing on meeting deadlines but with a particular eye on quality of service. DnD team has been always available and their communication was flawless. All in all, it's been a pleasure working with them, so I'm more than happy to recommend the services of DevandDeliver.

Andreas Nagy, Possible / Project Director

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QA engineers from Kraków, Poland

Dev and Deliver

sp. z o.o. sp. k.

Address

Józefitów 8

30-039 Cracow, Poland

VAT EU

PL9452214307

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368739409

KRS

94552994