Performance Testing Services

Performance Testing Services – Optimize for Speed and Scalability

Our thorough testing solutions identify and eliminate bottlenecks to boost speed, responsiveness, and reliability, delivering a stable and resilient application that performs flawlessly in a variety of conditions.

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Clients Served

30,000+

Total Vetted Professionals

20,000+

Toptal Total Projects Delivered

85,000+

Years in Business

15+

TRUSTED BY LEADING BRANDS

Our Services

Toptal Performance Testing Services

Optimize your software’s speed, reliability, and scalability with Toptal’s Performance Testing Services. Our comprehensive testing solutions verify that your applications will perform flawlessly in any scenario, providing a seamless and efficient user experience.

Load Testing

Simulate real-world scenarios to confirm your software application manages peak loads without degradation.

Scalability Testing

Assess your software’s scalability as user demands grow, maintaining consistent performance at any scale.

Performance Testing on Cloud

Use cloud environments for comprehensive performance testing, ensuring reliability across multiple scenarios.

API Performance Testing

Test your APIs in a variety of conditions to assess whether they meet key performance metrics and deliver quick, reliable user responses.

Performance Monitoring

Continuously track performance metrics to proactively resolve bottlenecks and maintain fast response times.

Endurance Testing

Validate your software’s reliability over long periods, to establish consistent performance during extended use.

Stress Testing

Push your software to extreme loads to uncover performance bottlenecks and confirm that it can remain stable under stress.

Website Performance Testing

Optimize your site’s Core Web Vitals (CWV) to achieve fast load times and deliver the best user experience.

Stability Testing

Verify long-term stability by assessing your software’s performance under varying load conditions over time.

Capacity Testing

Determine the maximum user load your software can handle while maintaining optimal performance.

Spike Testing

Test your software’s resilience by simulating sudden load spikes, verifying it can handle rapid user surges.

Network Performance Testing

Evaluate your software’s behavior under varying network conditions to establish consistent performance.

Looking for guidance about the perfect performance testing service for your needs?

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PARTNERSHIP THAT WORKS

How We Deliver Performance Testing Services

Our performance testing experts, with experience at leading companies, develop tailored solutions to meet your business needs and unique industry demands for sustainable results and long-term success.

Discover

A leader from our team works with you to understand your business challenges, pain points, and strategic goals to uncover new opportunities and identify the options to reach your objectives.

Define

Toptal leaders collaborate with your team to define your specific goals and service needs, evaluating multiple approaches and aligning requirements with your strategic objectives to define the best solution.

Develop

Once your service is defined and you have your talent or team on board, they will create your unique project timeline, process, and initial proposals, whether it’s conducting stress tests or developing a comprehensive end-to-end performance testing strategy.

Deploy

Toptal will get to work, tracking quality assurance, handling project management, and maintaining the delivery schedule.

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Robert Orshaw

CEO, Technology Services

As Toptal’s CEO of Technology Services, Robert leads strategy and operations across our technical services portfolio, spanning AI, automation, and operations. He previously served as Deloitte’s Managing Director & Chief Commercial Officer, transforming its Cloud Operate and Engineering business into a multibillion-dollar operation. He held senior roles at IBM, Velocity, co-founded Corio, and was CIO for two Fortune 100 manufacturers.As Toptal’s CEO of Technology Services, Robert leads strategy and operations across our technical services portfolio, spanning AI, automation, and operations. He previously served as Deloitte’s Managing Director & Chief Commercial Officer, transforming its Cloud Operate and Engineering business into a multibillion-dollar operation. He held senior roles at IBM, Velocity, co-founded Corio, and was CIO for two Fortune 100 manufacturers.

Previously At

CUSTOMIZED SOLUTIONS

Performance Testing Services That Deliver Value

Toptal delivers leading performance testing services through its diverse talent network and flexible delivery models. We implement the right skills at each project phase, blending expertise from various roles for seamless execution.

End-to-End Delivery by Toptal
On-demand Talent and Teams

End-to-End Delivery by Toptal

Comprehensive project delivery, tailored to your specific requirements.

CEO, Technology Services

Delivery Manager

Performance Testing Architect

Quality Assurance Expert

Performance Testing Engineer

Test Automation Engineer

API Testing Expert

Quality Assurance Expert

Robert Orshaw

CEO, Technology Services

Previously at

Technology Experience

35+ Years

Rachael Karaffa

Delivery Manager

Rachael serves as a Delivery Manager at Toptal with a focus on leading diverse global teams in developing innovative solutions for our clients. She works across multiple disciplines, including technology, marketing, and management consulting. Rachael specializes in managing people and client relationships, process optimization, and driving teams toward optimal business outcomes.

Previously Managed Client

Experience

9+ Years

Sargis Sargsyan

Verified Expert in Engineering

13+ Years

of Experience

Performance Testing Architect

Sargis is a QA engineer and currently a director of quality engineering with 13+ years of experience and deep expertise in test automation. He has worked with companies specializing in mobile, web, SaaS, and enterprise applications. Sargis has been an excellent asset to distributed international teams, is an advocate for the Agile methodology, and is a skilled practitioner of Agile, Scrum, and Kanban.

Previously at

Seema K Nair

Verified Expert in Engineering

20+ Years

of Experience

Quality Assurance Expert

Seema brings more than 20 years of software testing and quality assurance expertise to the table. She has substantial experience with manual testing and the test automation of web and mobile applications. Seema is a certified Scrum master, an IBM- certified Db2 professional, and an AWS-certified solutions architect comfortable with Agile and Waterfall approaches. Her in-depth knowledge of API and performance testing delivers excellent results.

Previously at

Adrian Lachowski

Verified Expert in Engineering

10+ Years

of Experience

Performance Testing Engineer

Since 2014, Adrian has been developing using Java and a variety of testing frameworks such as JUnit, TestNG, Selenium, Cucumber, and REST Assured, along with tools like JMeter, SoapUI, and IntelliJ IDEA. He has worked with numerous teams and projects, which enables him to communicate easily and adapt seamlessly to new work environments. Adrian is passionate about test automation and has joined Toptal to broaden the reach of his expertise through global freelance projects.

Previously at

Sebastian Ostrowski

Verified Expert in Engineering

18+ Years

of Experience

Test Automation Engineer

Since 2006, Sebastian has been working in the field of software quality assurance, specializing in tests (automation and strategy definition). He has developed appropriate processes, prepared documentation, selected automation approaches, and implemented test automation frameworks, tests, and CI/CD integrations. In addition, he has built various automation solutions—from complicated event-driven distributed systems with microservices to web apps.

Previously at

Chieko Higashi

Verified Expert in Engineering

19+ Years

of Experience

API Testing Expert

Chieko is a senior QA engineer with 19 years of experience testing software in various industries such as apparel, fintech, and security. She has led teams in the implementation of software QA, test automation, and manual QA, as well as managed QA test plans to ensure that the end product is robust and high quality. Chieko is passionate about achieving quality by following good development and QA processes, and is wholeheartedly dedicated to ensuring that software meets the customers’ needs.

Previously at

Enzo Heredia

Verified Expert in Engineering

18+ Years

of Experience

Quality Assurance Expert

Enzo is an engineer with more than 18 years of experience in QA automation, working with the latest technologies and highest industry-quality standards to automate web UIs, REST APIs, and back-end services. He’s comfortable in startups as well as large companies, either as the only person in a QA role or a member of any size team. He also has experience defining processes, procedures, and tools to achieve the best quality.

Previously at

On-demand Talent and Teams

20,000+ vetted professionals, ready to deploy individually or in teams.

Performance Testing Project Manager

Test Automation Engineer

Quality Assurance Expert

Regression Testing Expert

Performance Testing Expert

Test Automation Engineer

Manual Testing Expert

Testing Expert

Security Expert

Verified Expert in Project Management

20+ Years

of Experience

Performance Testing Project Manager

Tony is a seasoned Agile professional who started as a self-taught programmer in the US Navy. He had served in every role of the SDLC before bringing his software engineering passion to Agile project management. His technical skills, combined with his managerial, communication, and analytic abilities, have served him well while successfully guiding teams. Tony uses these talents and his development experience to lead by example while helping organizations create greater value through software.

Previously at

Verified Expert in Engineering

13+ Years

of Experience

Test Automation Engineer

Ravi is a QA test automation engineer with 13+ years of web and mobile experience. He delivers solutions at different levels of the test pyramid and helps clients introduce CI/CD workflows, create deployment pipelines, and improve overall QA processes and outcomes. Ravi’s enterprise QA experience includes LTI, ClinicalWorks, CitiusTech, Tata Consultancy Services, and Capgemini. In addition to three ISTQB certifications, Ravi is a certified Scrum master.

Previously at

Verified Expert in Engineering

11+ Years

of Experience

Quality Assurance Expert

Dolly is a QA engineer with more than 11 years of experience in a range of industries, including real estate, travel, finance, and aviation. She has created multiple testing frameworks from the ground up using Selenium, TestNG, Cucumber, and Cypress, and has automated QA processes. Dolly manages test execution not only from the technical point of view but also from the customer’s, as she believes product usability is as vital as functionality.

Previously at

Verified Expert in Engineering

12+ Years

of Experience

Regression Testing Expert

Dimitris is a QA automation architect focused on de-risking clients’ technical investments by upskilling teams and automating processes. He particularly enjoyed his four years at Novoda, the mobile agency, where he worked on challenging projects with no existing testing practices. Dimitris has set up clients’ QA teams from scratch and has developed his leadership skills.

Previously at

Verified Expert in Engineering

11+ Years

of Experience

Performance Testing Expert

Satish is an adaptable and technically strong professional with a customer business value-added mindset and several years of experience in quality assurance for companies like Deloitte and Consensys. While Satish specializes in Selenium, Cypress, and API testing, he’s also comfortable building automation test frameworks and recently led the technical portfolio for an automation project.

Previously at

Verified Expert in Engineering

17+ Years

of Experience

Test Automation Engineer

Christina is a senior QA engineer with expertise in test automation, test management, and manual testing for web and mobile applications. She has created test automation frameworks from the ground up using Selenium WebDriver in several projects, as well as automating API testing using REST Assured and Postman. With experience in both private and public sectors, Christina has worked with large, medium-size, and small startup companies.

Previously at

Verified Expert in Engineering

11+ Years

of Experience

Manual Testing Expert

Natalija is a software tester experienced in manual testing, mainly working on e-commerce and telecommunications projects. She was the leading QA specialist in a mobility transformation project involving customer data migration from legacy systems for a major telecom provider in Europe. Natalija’s expertise includes API automation testing, as she has completed several projects for an international energy holding company.

Previously at

Verified Expert in Engineering

12+ Years

of Experience

Testing Expert

Harish is a QA professional with more than 12 years in different QA roles (test lead, Scrum master), including in test automation, test management, test analysis, and manual testing. He specializes in different testing levels (unit/API/E2E) and testing types (functional, performance, security) for mobility, web, APIs, and legacy mainframe applications. With a solution-oriented mindset and a customer-centric focus, Harish is a team player who enjoys working with people following the Lean and Agile approaches.

Previously at

Verified Expert in Engineering

18+ Years

of Experience

Security Expert

Claudio has more than 18 years of software development experience and a cybersecurity degree. He has worked in back-end, front-end, and full-stack development; DevSecOps; application security; penetration testing; and solutions architecture.

Previously at

Looking for guidance about the perfect performance testing service for your needs?

Get a Free Consultation Now

Looking for guidance about the perfect performance testing service for your needs?

UNRIVALED EXPERTISE

Our Talent Has Worked With Top Companies

Having previously worked with these leading global companies, our talent brings valuable insights and expertise to deliver world-class outcomes.

WHY ORGANIZATIONS CHOOSE US

Toptal in Action

Discover the cutting-edge benefits our clients enjoy from the global Toptal network.

Toptal full-stack experts clear 6 months of backlogged bugs in 6 weeks.

Challenge: Software defects can cause critical errors and widespread user dissatisfaction for tech brands. A big data software provider was facing a six-month backlog of these defects, reported by its top clients. Its engineers were overwhelmed, trying to simultaneously address incoming reports and product development—reducing productivity and fueling staff turnover.

Solution: In only six weeks, Toptal’s team cleared the six-month backlog while simultaneously processing day-to-day tickets. In a 14-month span, they resolved 266 top-priority product defects and managed countless daily tasks.

Outcome: Toptal’s solution enabled the software provider to improve the end-user experience across all products. Toptal’s experts are now training a dedicated in-house team to transition to a scalable ticket processing system.

Clement [technical lead from Toptal] is doing excellent work, especially with landing the most difficult tickets. He delivers early, proactively seeks out ways to help others, and is a super performer.

Senior Software Delivery Manager

Big Data Software Provider

Toptal Ranked #1 Most Reliable Professional Services Company in America

Newsweek and Statista’s rankings were based on an independent survey of more than 2,400 decision-makers at Fortune 500s.

IBM — Newsweek's Most Reliable Companies in America 2026 ranking. Toptal is ranked #11, the highest-ranked professional services firm.

See the Most Reliable Companies in America

Methodology for the Rankings

How likely the respondent is to recommend the selected company to others.

Measures the convenience of interaction with the company and efficiency of processes.

Measures the company’s cost-effectiveness and quality relative to price.

Measures whether the company consistently meets or exceeds expectations in quality and timeliness of deliverables.

Measures the company’s ability to consistently fulfill commitments and maintain customer trust.

See the Most Reliable Companies in America

OUR THOUGHT LEADERSHIP

Explore Insights From the Performance Testing Field

Read the latest articles and resources to keep you current on emerging trends in performance testing and usability.

A Guide to Performance Testing and Optimization With Python and Django

Donald Knuth said that “premature optimization is the root of all evil.” But there comes a time, usually in mature projects with high loads, when the need to optimize presents itself. In this article, Toptal Freelance Software Engineer Iulian Gulea talks about five common methods to optimize a web project’s code using principles that can be used in Django, as well as in other frameworks and languages. Using these principles, he demonstrates how to reduce the response time of a query from 77 to 3.7 seconds.

Iulian Gulea

Verified Expert in Engineering

14 Years of Experience

Iulian is a software engineer with experience developing web projects of all sizes, from simple sites to complex SaaS products. Previously a full-stack developer for PepsiCo, Iulian has worked both individually and in teams for companies large and small.

Expertise

Python Django

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