Senior Performance Engineer - Contract

Job Title: Senior Performance Engineer 

Location: London - Hybrid 

Role Type: Contract - Outside IR35

Duration: 6 months + opportunity to extend 

Security Clearance: Active SC (Security Clearance) is essential and ideally NPPV3 (eligibility also accepted)

Sponsorship: Please note, we are unable to provide sponsorship for this opportunity

Who we are:

At 2i, we're passionate about making technology work better.

We're the UK's largest pure play Quality Assurance and Software Testing business, helping organisations deliver complex technology change with confidence.

From Quality Engineering and Test Automation to Strategic Consultancy and AI Assurance, we work with organisations across the public and private sectors to solve challenges, reduce risk and deliver real impact.

2026 has been an exciting year for us. With the addition of Planit UK to the 2i family and the continued expansion of our delivery capabilities in India, we're growing our expertise, our reach and the opportunities available to our people.

And it's our people who make it all possible.

Why Join 2i?

Great people. Interesting challenges. Real opportunities to grow.

We're proud to be certified as a Great Place to Work for the fourth consecutive year and to be recognised as one of the UK's Best Workplaces in Tech and Best Workplaces for Wellbeing in 2026.

But what really makes 2i special is our people.

We're a team of curious thinkers, problem solvers and collaborators who enjoy sharing knowledge, challenging ideas and finding better ways to do things.

Whether you're developing your expertise, exploring new technologies or taking the next step in your career, we want you to feel supported, valued and encouraged to succeed.

You'll have opportunities to work on meaningful projects, learn from talented colleagues and contribute to a business that's continuing to evolve and grow.

 You'll need to be...

• A performance testing specialist. You'll have significant commercial experience in performance and non-functional testing, with a solid understanding of load, stress, spike, endurance/soak, volume, capacity and resilience testing.
• An expert in JMeter. You'll have in depth, hands-on experience using Apache JMeter to design, develop and execute performance tests across complex applications.
• An extensive background with automation. You'll have experience developing automated performance testing solutions and reusable automation assets using one or more languages such as Java, Python or JavaScript.
• Experienced with AWS. You'll have strong practical experience working with AWS services including EC2, ECS, Lambda, RDS, CloudWatch, Auto Scaling and Load Balancers, and understand how cloud architecture influences application performance and scalability.
• Experienced with Linux/Unix. You'll be confident troubleshooting Linux/Unix environments and investigating performance issues across application and infrastructure layers.
• Experienced with CI/CD. You'll understand how to integrate automated performance testing into Jenkins and CI/CD pipelines, helping bring performance validation further into the development lifecycle.
• Data and metrics driven. You'll be comfortable analysing performance metrics and using monitoring and observability tooling to identify bottlenecks and understand system behaviour.
• Experienced with distributed systems. You'll have worked with APIs, microservices and distributed architectures, understanding the challenges they introduce from a performance perspective.
• Comfortable with monitoring and observability. Experience with tools such as Grafana and Prometheus will be valuable when analysing system performance and identifying bottlenecks.
• A technical problem solver. You'll enjoy investigating complex performance issues across application, infrastructure, database and network layers and turning your findings into clear recommendations.
• A confident communicator. You'll be able to influence technical decisions across multidisciplinary teams and clearly communicate performance risks, findings and recommendations to stakeholders.
• Comfortable working in Agile environments. You'll understand modern engineering practices and how performance testing fits into an Agile software delivery lifecycle.

Our Culture

Our values are simple. We care about our colleagues, continuously develop our expertise, deliver value to our clients and make time to enjoy what we do.

We believe that great work happens when people feel trusted, supported and connected.

As we continue to grow, we're committed to creating an environment where people can build meaningful careers, share ideas and make a genuine contribution.

Ready to Join Team2i?

If you're looking for your next opportunity and want to be part of a business where your ideas, skills and curiosity are valued, we'd love to hear from you.

Explore our opportunities and discover where your career could take you with #Team2i.