In the fast-paced world of software development, speed is everything — but rushing a product to market without proper testing can lead to serious consequences. From data leaks and broken features to catastrophic downtime, undetected bugs have cost companies millions and damaged reputations overnight.

That's why quality assurance testing services are a vital part of any successful software development process. Whether you're building a mobile app, a web platform, or enterprise software, catching bugs before launch can be the difference between smooth success and public embarrassment.

Let's explore some of the most common bugs caught during QA testing — the ones that saved companies from costly disasters — and how using modern QA automation software and expert software QA services helps detect them early.

1. Broken Payment Gateways

Bug Example: A large e-commerce platform once discovered during testing that its checkout process failed when customers used specific discount codes on mobile devices.

Impact If Missed: Lost revenue, frustrated customers, and an influx of support tickets.

QA Save: Through a mix of manual testing and automated payment flow scripts, the bug was caught early. Fixing it before launch prevented thousands of failed transactions.

Takeaway: Payment and transaction testing should never be skipped. QA testers simulate real-world scenarios to ensure all use cases — including edge cases — are handled correctly.

2. Data Loss During User Registration

Bug Example: A healthcare tech startup's new user sign-up form had a bug that erased data if users hit the “back” button mid-registration.

Impact If Missed: Loss of sensitive information, user frustration, and potential compliance violations.

QA Save: Using QA automation software, the team was able to simulate user behavior and identify the issue. The fix ensured data persistence, and the company avoided legal and reputational damage.

Takeaway: Functional testing combined with stress testing is key — especially in industries where data integrity is critical.

3. Security Flaws in Login Systems

Bug Example: A SaaS product's login page allowed unlimited password attempts without lockout, making it vulnerable to brute-force attacks.

Impact If Missed: Security breach, compromised user accounts, and loss of trust.

QA Save: Security testing during software QA services revealed the vulnerability. The development team added rate-limiting and 2FA before launch.

Takeaway: Security testing is essential, especially for login systems, APIs, and admin panels. Even small oversights can open the door to hackers.

4. Incompatible Browser Rendering

Bug Example: A finance dashboard looked perfect in Chrome but broke in Safari and Firefox — graphs didn't load and key functions were missing.

Impact If Missed: User dissatisfaction, poor reviews, and increased churn rate.

QA Save: Cross-browser testing via quality assurance testing services caught the issue. The developers used browser-specific patches and responsive design tweaks to resolve it.

Takeaway: Don't assume all users are on the same browser. Real-world testing across platforms is critical to a seamless user experience.

5. Performance Bottlenecks Under Load

Bug Example: A media app ran smoothly with a few users but crashed when traffic spiked after a product launch.

Impact If Missed: Server crashes, negative publicity, and revenue loss.

QA Save: Load testing and performance simulation — core components of modern software QA services — revealed memory leaks and server limits. Scaling strategies were implemented before going live.

Takeaway: Apps should be tested not just for functionality but for scalability and load. Simulating real-world conditions can expose critical performance flaws.

6. Broken Push Notifications

Bug Example: A food delivery app's push notifications were inconsistent — iOS users didn't get alerts when orders were ready.

Impact If Missed: Missed pickups, angry customers, and poor app reviews.

QA Save: Using device farms and real-device testing (a feature in many QA automation software tools), the QA team replicated and resolved the issue.

Takeaway: Real device testing — not just simulators — is crucial when delivering platform-dependent features like notifications or GPS tracking.

How 86 Agency Leads in QA Excellence

When working with a trusted development and testing partner like 86 Agency, these potential issues are addressed from day one. Their end-to-end software QA services combine:

  • Manual and automated testing



  • Regression and integration testing



  • Security audits



  • Performance and stress testing



They leverage modern QA automation software tools to speed up test cycles while ensuring every function, button, and API is working exactly as it should.

Clients benefit not only from bug-free launches but also from long-term product stability — reducing downtime, lowering customer complaints, and increasing user satisfaction.

Final Thoughts

Bugs are inevitable — but disasters don't have to be. With proactive testing and reliable quality assurance testing services, companies can catch and fix issues before they become problems. From broken checkout flows to performance hiccups and security gaps, the right QA team can make or break your software's success.

Whether you're building your next big app or upgrading an existing platform, partnering with a reliable provider like 86 Agency ensures your software is polished, secure, and launch-ready — every time.