Choosing the right integration testing partner is critical for ensuring that your systems work together flawlessly. In this article, we highlight the top integration testing companies in the USA known for their technical expertise, industry experience, and commitment to quality. Whether you’re launching a complex software product or streamlining enterprise systems, these firms can help ensure smooth and reliable performance.
1. A-Listware
We are a software development and consulting company that helps US organizations verify how their software parts work together. Our integration testing teams check data flows, API calls, third-party services, and security paths so every module communicates as planned. Based out of North Bergen, New Jersey, we sync with client schedules, giving direct access to testers who understand local compliance and release cycles.
Integration testing sits inside a full delivery loop that covers design, coding, infrastructure, and support. By placing our engineers alongside customer developers, we shorten feedback loops, resolve issues early, and keep releases steady. This joined approach limits surprise defects later in the life-cycle and supports smooth, on-time launches.
Key Highlights:
- US contact point with 24-hour team access
- Tight collaboration with in-house engineers
- Scalable staffing to match project load
- Secure workflows that protect IP
- Background across finance, healthcare, retail, and more
Services:
- Integration and system testing
- Test automation setup and upkeep
- Manual exploratory QA
- Performance and load checks
- API and microservice validation
- Continuous integration pipeline support
- Consulting on test strategy and tooling
Contact Information:
- Website: a-listware.com
- Email: info@a-listware.com
- Facebook: www.facebook.com/alistware
- LinkedIn: www.linkedin.com/company/a-listware
- Address: North Bergen, NJ 07047, USA
- Phone Number: +1 (888) 337 93 73
2. QAwerk
QAwerk is a US-focused quality assurance company specializing in integration testing for web, mobile, and desktop applications. Their engineers validate how individual modules and third-party components work together across real-world workflows, helping uncover hidden communication issues between services, APIs, and databases before they impact production. The team uses both automated and manual techniques to simulate end-to-end system behavior, ensuring all dependencies interact as expected in complex environments.
QAwerk serves clients in the media, finance, and SaaS sectors, with an emphasis on smooth integration into existing CI/CD pipelines. Their approach minimizes service disruption while delivering clear, prioritized test reports. With a strong focus on reproducibility and root-cause analysis, QAwerk enables development teams to detect and resolve integration bugs faster – improving software reliability and release confidence without long onboarding cycles.
Key Highlights:
- Independent testing agency with dedicated security practice
- Combines automated and manual code analysis
- Penetration scenarios validate real impact
- Detailed reports with fix recommendations
- Experience across multiple US industry domains
Services:
- Secure code review
- Static application security testing
- Manual code walkthroughs
- Web and mobile penetration testing
- API vulnerability assessment
- Security test strategy consulting
Contact Information:
- Website: qawerk.com
- E-mail: sales@qawerk.com
- Facebook: www.facebook.com/QAwerk
- Twitter: x.com/qawerk
- LinkedIn: www.linkedin.com/company/qawerk
- Instagram: www.instagram.com/qawerk.testing
- Phone: +1 347 329 1444
3. A1qa
A1QA is a quality assurance company with a strong presence in the USA, including a dedicated office in Decatur, Georgia, enabling close collaboration with American software teams. They specialize in integration testing services that validate how different components, modules, and third-party systems interact within complex software environments. Their approach ensures that data flows, service communications, and API interactions function correctly across the full application stack.
The A1QA team supports integration testing across web, mobile, and enterprise systems, aligning with Agile and DevOps workflows. Tests are designed to uncover misconfigurations, broken dependencies, and unexpected behavior during module interaction – issues often missed during unit testing. Their integration testing process can be embedded into CI/CD pipelines, allowing for continuous verification at every stage of development and before major releases.
Key Highlights:
- Uses both automated scanning and manual review
- Aligns with OWASP and similar guidelines
- Works within existing CI pipelines
- US contact point in Decatur, GA
- Reports include clear remediation steps
Services:
- Secure code review
- Static application security testing
- Manual code walkthroughs
- API and web vulnerability assessment
- Integration of security checks into CI workflows
Contact Information:
- Website: www.a1qa.com
- Facebook: www.facebook.com/a1qa.software.testing
- Twitter: x.com/a1qa_testing
- LinkedIn: www.linkedin.com/company/a1qa
- Address: 160 Clairemont Ave, Suite 200, Decatur, GA 30030
- Phone: +1 720 207 5122
4. TestMatick
TestMatick provides integration testing services for US software teams from their base in New York. Their specialists focus on verifying how application modules interact across entire workflows, ensuring APIs, databases, and external services communicate as expected. By simulating real user behavior and system-level operations, they help detect issues such as data mismatches, broken dependencies, and inconsistent process flows that typically emerge after unit testing.
Their testing strategy combines custom test suites with CI/CD integration, enabling teams to automatically verify system integration on every merge or deployment. TestMatick works with web, mobile, and enterprise applications across various industries, ensuring that changes in one module don’t silently break functionality elsewhere. Their clear, actionable reports reduce debugging time and help engineering teams deliver stable, well-integrated releases with confidence.
Key Highlights:
- Headquarters and support team in New York for US time zones
- Automated plus manual review to widen coverage
- Checks target injection, XSS, and auth weaknesses
- Findings fed into CI pipeline for rapid feedback
- Penetration data used to confirm real-world risk
Services:
- Secure code review
- Static analysis configuration and tuning
- Manual source inspection
- API and web vulnerability assessment
- Penetration testing support
- CI pipeline integration for security checks
Contact Information:
- Website: testmatick.com
- E-mail: contact@testmatick.com
- Facebook: www.facebook.com/testmatick
- Twitter: x.com/testmatick
- LinkedIn: www.linkedin.com/company/testmatick
- Instagram: www.instagram.com/testmatick.team
- Address: 276 5th Ave Suite 704, New York, NY 10018
- Phone: +1 (212) 203-8264
5. CelticQA
CelticQA offers integration testing services for US-based software teams, helping ensure that system components work seamlessly together across complex environments. Their engineers test the interactions between APIs, databases, and third-party services to uncover issues like failed data transfers, inconsistent logic across modules, and broken workflows that unit tests often miss. These tests are designed to reflect real-world usage and are critical for identifying failures in business-critical processes.
Operating from Georgia and other US locations, CelticQA embeds integration testing directly into CI pipelines to support fast, iterative development. Their team provides repeatable test coverage on every merge, with detailed reports highlighting faults, dependencies, and clear paths to resolution. This approach minimizes release risk and supports consistent software delivery across a wide range of industries.
Key Highlights:
- Automated and manual code analysis
- Secure data exchange checks across integrated systems
- Reports mapped to CI pipelines for quick fixes
- US presence for same-day collaboration
- Experience across finance, insurance, retail, and software products
Services:
- Secure code review
- Static analysis setup and tuning
- Manual source inspection
- API and integration vulnerability assessment
- CI pipeline security integration
Contact Information:
- Website: celticqa.com
- E-mail: info@CelticQA.com
- LinkedIn: www.linkedin.com/company/celticqasolutionsus
- Address: 1720 Mars Hill Rd 8 201, Acworth, GA 30101, USA
6. QA Madness
QA Madness provides integration testing services for US software teams, ensuring that all components within a system interact smoothly across different platforms, including web, mobile, and desktop. Their engineers design and execute tests that validate how APIs, services, databases, and user interfaces work together – catching issues like data mismatches, broken process flows, and unstable third-party integrations that can disrupt functionality after deployment.
Their integration testing process is embedded into clients’ CI pipelines, enabling automated checks on every code merge. This allows development teams to detect and resolve inter-module issues early in the release cycle. QA Madness delivers clear, actionable reports aligned with sprint priorities, helping teams fix integration failures quickly without delaying releases. Their flexible approach adapts to diverse tech stacks, making them a reliable partner for scalable and maintainable software delivery.
Key Highlights:
- Combines automated scanners and manual inspection
- Uses an OWASP-aligned process
- Maps review findings to business risk
- Supports web, mobile, and desktop stacks
- Delivers reports that fit existing CI pipelines
Services:
- Secure code review
- Static analysis setup and tuning
- Penetration testing support
- Vulnerability assessment
- Security audit consulting
- Risk-based remediation guidance
Contact Information:
- Website: www.qamadness.com
- E-mail: hello@qamadness.com
- Facebook: www.facebook.com/qa.madnesss
- Twitter: x.com/Qamadness
- LinkedIn: www.linkedin.com/company/qamadness
- Instagram: www.instagram.com/qa.madness
7. PixelQA
PixelQA specializes in integration testing for US software teams, ensuring that individual modules, services, and APIs work cohesively across complex application environments. Their engineers validate end-to-end system behavior to catch issues like broken data flows, misaligned service logic, and third-party integration failures that often surface after unit testing. This helps clients maintain consistent functionality across web, mobile, and enterprise platforms.
Integration tests are embedded directly into clients’ CI pipelines, allowing for automated verification on every merge without slowing development. With a US office in Independence, Missouri, PixelQA offers same-time-zone support for real-time collaboration during stand-ups and issue triage. Their detailed reports include reproducible test scenarios and remediation guidance, helping engineering teams resolve integration bugs quickly while keeping release schedules on track.
Key Highlights:
- Automated and manual code analysis
- Findings ranked by business impact
- Integrated into existing CI workflows
- US presence for real-time collaboration
- Supports web, mobile, and API stacks
Services:
- Secure code review
- Static analysis setup and tuning
- Manual source inspection
- API and web vulnerability assessment
- CI pipeline security integration
Contact Information:
- Website: www.pixelqa.com
- E-mail: info@pixelqa.com
- Facebook: www.facebook.com/pixelqa.company
- Twitter: x.com/pixelqa_company
- LinkedIn: www.linkedin.com/company/pixel-qa
- Address: 14720 E., 44th St. S. Independence, MO, USA 64055
- Phone: +1 540 404 5858
8. ScienceSoft
ScienceSoft offers robust integration testing services for US-based development teams, focusing on verifying how software components interact across real-world workflows. Their specialists test the integration points between modules, APIs, and third-party systems to uncover issues such as broken data exchanges, inconsistent business logic, and system-level errors that escape unit testing. This ensures that all parts of the application function seamlessly as a whole.
Integration testing is built into the same CI pipelines that support clients’ automated test suites, enabling continuous validation on every code merge. With a team operating from their Texas office, ScienceSoft aligns closely with US working hours, allowing for efficient collaboration during daily stand-ups and defect triage. Their structured test reports and prompt feedback cycles help teams ship reliable, integrated software without disrupting development velocity.
Key Highlights:
- Manual and automated code analysis tied to OWASP
- Results integrated with existing CI workflows
- Actionable reports that rank issues by impact
- US-based security team for same-day collaboration
- Experience across web, mobile, and API stacks
Services:
- Secure code review
- Static application security testing
- Manual source inspection
- CI pipeline security integration
- Vulnerability remediation guidance
- Penetration testing support
Contact Information:
- Website: www.scnsoft.com
- E-mail: contact@scnsoft.com
- Facebook: www.facebook.com/sciencesoft.solutions
- Twitter: x.com/ScienceSoft
- LinkedIn: www.linkedin.com/company/sciencesoft
- Address: 5900 S. Lake Forest Drive, Suite 300 McKinney, Dallas area, TX-75070
- Phone: +1 214 306 68 37
9. Jalasoft
Jalasoft delivers integration testing services that help US software teams validate how application components interact across complex systems. Their engineers design tests that simulate real-world data flows and cross-service logic to uncover integration failures – such as broken APIs, inconsistent database transactions, and communication mismatches – that can disrupt functionality after deployment.
These tests are integrated into the same CI pipelines used for automated unit and functional testing, ensuring quick feedback on every merge. With a highly skilled team drawn from the top 2% of LATAM engineers and operating in US-aligned time zones, Jalasoft offers seamless collaboration. Their nearshore model enables active participation in stand-ups and live troubleshooting, keeping integration quality high without slowing delivery.
Key Highlights:
- Automated and manual code analysis
- DevSecOps approach based on continuous review
- Findings mapped to real attack scenarios
- Nearshore team in US-aligned time zones
- Reports include step-by-step remediation guidance
Services:
- Secure code review
- Static analysis setup and tuning
- Manual source inspection
- CI/CD security integration
- Vulnerability assessment and penetration support
Contact Information:
- Website: www.jalasoft.com
- Facebook: www.facebook.com/JalasoftLatam
- LinkedIn: www.linkedin.com/company/jalasoft
- Instagram: www.instagram.com/jalasoft
- Phone: +1 (254) 284-7459
10. TestFort
TestFort provides comprehensive integration testing services for US businesses across healthcare, finance, and retail. Their QA teams focus on verifying how different modules, APIs, and third-party services work together under real-world conditions. By simulating multi-layered workflows and checking data consistency across system boundaries, they catch critical defects like mismatched service logic, failed API calls, and transaction errors that aren’t visible in unit testing.
Integration tests are embedded directly into the CI/CD pipeline, enabling automated validation on every pull request and preventing regressions before staging. With experience in regulated industries, TestFort tailors its test scenarios to reflect domain-specific risks, such as disruptions to payment gateways or data flow between EHR systems. Clear, ranked reports ensure fast triage and help teams fix issues without slowing the release cycle.
Key Highlights:
- Combines static analysis with manual code reading
- Shift-left reviews run on every merge
- Findings ranked by business impact with clear fixes
- Experience across healthcare, finance, and retail stacks
- Supports CI workflows and common DevOps tools
Services:
- Secure code review
- Static application security testing
- Manual source inspection
- CI pipeline security integration
- Vulnerability assessment and remediation guidance
Contact Information:
- Website: testfort.com
- E-mail: contacts@testfort.com
- Twitter: x.com/Testfort_inc
- LinkedIn: www.linkedin.com/company/testfortqa
- Instagram: www.instagram.com/testfort_ua
- Address: 30 N Gould St, Ste R, Sheridan, WY 82801
- Phone: +1 310 388 9334
11. Sun Technologies
Sun Technologies provides system integration testing services that focus on verifying the communication and data flow between software components and systems. Their approach emphasizes detecting failures that occur at the interfaces rather than within individual components. They apply established testing methods like white box and black box techniques to ensure that integrated parts work together without issues. Their testing process involves preparing detailed plans, designing test cases based on component interactions, executing tests, tracking defects, and repeating until integration is verified.
The company uses an incremental testing approach that can include top-down, bottom-up, or hybrid methods to isolate and resolve defects efficiently. They also emphasize understanding system architecture and risk analysis of interfacing components as part of their integration testing principles. Their services support various industries, including BFSI, healthcare, manufacturing, and retail, and involve use of automation tools to improve testing effectiveness.
Key Highlights:
- Focus on communication and data flow between integrated components
- Use of white box and black box testing methods
- Incremental integration testing approaches (top-down, bottom-up, hybrid)
- Emphasis on defect isolation and resolution
- Coverage of system architecture and risk analysis
- Support across multiple industries
Services:
- System Integration Testing (SIT)
- Test plan and test case design
- Execution of integration test suites
- Defect tracking and retesting
- Test automation solutions
- Staff augmentation for QA and testing teams
- Digital transformation and quality assurance support
Contact Information:
- Website: www.suntechnologies.com
- E-mail: sales@suntechnologies.com
- Facebook: www.facebook.com/SunTechnologies1996
- Twitter: x.com/SunTech_Inc
- LinkedIn: www.linkedin.com/company/sun-technologies
- Instagram: www.instagram.com/sun.technologies
- Address: 3700 Mansell Road Suite# 220, Alpharetta GA 30022, USA
- Phone: (770) 418-0434
12. Plego Technologies
Plego Technologies provides integration testing services aimed at verifying the interaction between different software components to ensure cohesive system functionality. Their approach combines automated and manual testing methods to simulate real-world scenarios and uncover integration issues early in the development lifecycle. They focus on various types of integration tests such as component integration, system-wide integration, API and web services validation, data synchronization, continuous integration testing, and regression testing. The company supports clients throughout development with ongoing testing and feedback to maintain system stability.
They emphasize comprehensive test coverage by creating detailed test scenarios that consider all component interactions, helping identify connectivity problems before they affect users. Plego also applies multiple integration testing strategies including bottom-up, top-down, and incremental approaches to fit the specific needs of the software environment. Their services extend across industries, providing tailored solutions that verify data flow, interface compatibility, and overall system performance.
Key Highlights:
- Combines automated and manual testing for thorough coverage
- Offers various integration testing types including API, data, and system integration
- Uses multiple testing approaches: bottom-up, top-down, incremental
- Provides continuous integration testing with regular feedback
- Supports regression testing to maintain functionality after updates
Services:
- Component Integration Testing
- System Integration Testing (SIT)
- API and Web Services Testing
- Data Integration Testing
- Continuous Integration Testing
- Regression Integration Testing
Contact Information:
- Website: plego.com
- E-mail: sales@plego.com
- Facebook: www.facebook.com/plegotech
- Twitter: x.com/plegotech
- LinkedIn: www.linkedin.com/company/plego-technologies
- Address: 4949 Forest Ave, First Floor Downers Grove, IL, 60515
- Phone: 630-541-7929
13. Qualimatrix
Qualimatrix provides integration testing services designed to ensure that different software components work together correctly. Their approach involves various testing methods to verify compatibility and overall system functionality across industries like healthcare, banking, and e-commerce. They emphasize collaboration with clients to develop testing solutions tailored to specific project requirements.
Their team consists of experienced professionals with certifications in software testing, focusing on quality and timely delivery. They incorporate modern testing tools and techniques to maintain software performance standards throughout the development lifecycle. Their services also extend to areas such as AI-driven QA and cybersecurity testing.
Key Highlights:
- Experienced and certified testing professionals
- Industry-specific knowledge in healthcare, banking, and e-commerce
- Customized testing solutions based on client needs
- Use of modern testing tools and techniques
- Focus on on-time delivery and maintaining quality
Services:
- Integration Testing
- AI QA Services
- Cybersecurity Testing
- Software Development Support
- AI Predictive Analysis
- Continuous Quality Assurance Audits
Contact Information:
- Website: www.qualimatrix.tech
- E-mail: support@qualimatrix.tech
- Facebook: www.facebook.com/qualimatrix
- Twitter: x.com/qualimatrixx
- LinkedIn: www.linkedin.com/company/qualimatrix
- Instagram: www.instagram.com/qualimatrix
- Address: 4900 California Ave, Bakersfield, CA 93309, United States
- Phone: +01 6614579795
14. QATestLab
QATestLab offers secure code review and integration testing services aimed at identifying potential issues in how software modules interact. Their work focuses on verifying that individual components, often developed by different teams, function properly when integrated. They apply different strategies depending on the project scope, using both full-system and incremental integration approaches to ensure reliable operation.
They adjust their testing techniques based on the development model used, supporting both traditional and continuous integration projects. Their process includes verifying module interactions through manual and automated methods, aiming to find defects early in the development process. This helps avoid problems during later stages of system deployment and reduces the cost of fixing issues post-release.
Key Highlights:
- Support for both manual and automated integration testing
- Incremental and full-system testing approaches
- Compatible with waterfall and continuous integration workflows
- Focus on early detection of integration issues
- Adaptable testing methods based on system architecture
Services:
- Secure Code Review
- Integration Testing
- Manual Testing
- Automation Testing
- Testing for Continuous Integration Projects
- Support for Scrum and Agile Development Processes
Contact Information:
- Website: qatestlab.com
- E-mail: contact@qa-testlab.com
- Facebook: www.facebook.com/qatestlab
- Twitter: x.com/QATestLab
- LinkedIn: www.linkedin.com/company/qatestlab
- Address: 34 Falirou Street, 1st Floor, Office 115 2066 Strovolos, Nicosia, Cyprus
- Phone: +357 22 27-04-66
Conclusion
Integration testing plays a vital role in ensuring that different parts of a software system work together as intended. As software systems grow more complex, the need for reliable integration testing services becomes even more critical. Companies that specialize in this area help identify issues early in the development cycle, reducing the risk of defects reaching production and improving overall software quality.
The integration testing companies based in the USA featured in this article offer a range of services, including secure code reviews, manual and automated testing, and support for various development models. Their structured approaches and industry experience make them valuable partners for businesses looking to build stable, high-performing applications.
