Quality assurance QA applications & websites tests

01Our quality assurance offer

Quality is at the core of any digital product, and we ensure it on every level. Our black box testing sees your application from the user's point of view—real-world uses, edge situations, and pressure under load without ever lifting the lid. Where the logic needs to be dissected, white box testing dives into the code itself and reviews loops, conditions, and execution paths to streamline efficiency and spot threats before they become liabilities. Not everything can be scripted—there are some bugs that take human insight. That's where our hand testing comes in, detecting hidden defects in usability and design that scripts miss. But when speed and reliability are most critical, our automated tests take over - executing millions of scenarios on devices and browsers, natively integrated into CI/CD pipelines. Security isn't an afterthought, either; with live penetration testing and threat modeling, we identify vulnerabilities before they become vulnerabilities. And to tie it all together, our audits drill deep into your software's architecture, revealing inefficiencies and providing actionable recommendations to future-proof your system. Quality assurance isn't just about finding bugs- it's about delivering software that works, lasts, and amazes.

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.

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.

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.

Automated testing

Repeated testing wastes time, period. Automated testing prevents that. We write test scripts that scale, run faster than any human process, catch regressions before they stop your development cold. Every change, every commit—tested instantly, easily incorporated into your CI/CD pipeline to keep smooth, predictable deploys rolling. No waiting around, no slowdowns, just speedy, reliable feedback. Stability is of the utmost importance, so we don't just test in one place; we validate functionality on browsers, devices, and operating systems, ensuring consistency wherever your users are. And because automation isn't just about speed but also accuracy, our tests are repeatable, eliminating human error and making quality a certainty, not an if.

Security checks

Security is not an simple checkbox on the list. It's an ongoing battle against perpetually evolving threats, and we're committed to it. Our security scans don't end with skin-deep checks—we test against live attacks with penetration testing, revealing weaknesses before the "bad guys" do. Threat modeling allows us to predict vulnerable spots in your architecture, taking a proactive stance rather than a reactive patch. APIs, databases, authentication flows—each level is reviewed, assessing threats that could lead to data breaches or unauthorized entry. But detection alone isn't enough. We implement best practice encryption, authentication, and compliance, strengthening your system with industry-standard protections. Because when security is at stake, prevention isn't just preferable to the cure - it's the only option.

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.

02Quality 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

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.

03Latest QA audit projects

Ensuring a flawless user experience

Reducing risks and ensuring security

At Dev And Deliver, we understand that an ideal user experience is the foundation of every successful digital product. Our testing process is all about ensuring that your application performs seamlessly across the board. We don't just test it on one device or browser—our rigorous testing covers a wide variety of platforms, so your users can use and interact with your product seamlessly, no matter what they use. This is more and more the case as the digital world becomes more varied, and your product needs to work flawlessly across all of them. We use a combination of black box and white box testing to identify not only functional defects but also tiny usability issues that get in the way of the user flow. They are usually tiny issues, but they can cause enormous frustration and push users away if left alone early in the process.

Consistency is what maintains user trust, and this is where our automated testing really shines. We conduct extensive regression testing so that new features or updates will not inadvertently cripple the user experience. Fixing bugs early on in the development stage means that your product will function smoothly regardless of even the most regular updates or alterations. At the end of the day, the mission is simple: create a product users adore to interact with, which functions perfectly, and is free of bugs. With our precise testing protocols, not only do we ensure technical excellence but also enhance customer satisfaction, reduce churn, and increase brand loyalty. If your product delivers as promised, users are more likely to stay engaged and come back for more.

In today's fast-paced digital world, it is not a choice to have security and stability for your application. At Dev And Deliver, we don't merely report bugs—we proactively defend your product from potential damage. Through thorough security audits and penetration testing, we detect vulnerabilities before they become entry points for attacks. By doing so, you can get ahead of attackers and ensure your product remains safe and reliable. With an ever-shifting security landscape, we also ensure your software meets the necessary industry regulations to reduce the monetary and legal cost of non-compliance. Doing so, this focus on security not only protects your brand, but also wins over your users' trust.

Performance is yet another critical focus we tackle. We don't allow slowdowns or system failures to happen—performance bottlenecks are addressed early in development. This early discovery helps us steer clear of issues that could result in downtime or hamper the user experience, ensuring smooth and reliable performance right out of the box. Also, by detecting problems early on, we forego costly post-launch fixes, which would otherwise be crisis hotfixes. With our automated tests and regular checks, we guarantee your app to be secure, optimized, and up to date, adapting to change as your product grows. With our commitment to risk mitigation and security, you can focus on what matters most—growing your business—while we handle the technical details.

04FAQ

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?

05Related posts

06Our clients

They’ve already trusted us.

07Testimonials

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

(+48) 789 188 353

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hi@devanddeliver.com