Software Development Engineer in Test London

Overview

is connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency.  has earned the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions.

Blockchain is the world's leading software platform for digital assets. Founded in 2011, we provide the world’s largest and most trusted production blockchain platform, powering more than 75 million wallets. Together with our platform of liquidity and execution services, we share the passion to build an open, accessible and fair financial future, one piece of software at a time.

We’re looking for a Software Development Engineer in Test (SDET) to join our Institutional team in London. At , we thrive in a high-performance culture defined by fearlessness, ownership, and hyper-productivity. As an SDET, you will play a critical role in ensuring the quality, reliability, and performance of our trading and financial systems.

• Design and build automated test frameworks and tools for low-latency, high-throughput trading services.
• Develop and maintain test suites across the full product lifecycle, including:
• Unit testing
• Integration testing (local and end-to-end)
• Performance and load testing
• Failure recovery testing
• Collaborate with software engineers to embed quality from the ground up in OMS, exchange gateways, risk management systems, and settlement services.
• Monitor, analyze, and improve system reliability, scalability, and performance through continuous testing.
• Ensure security-first testing practices, validating encryption schemes and protecting user and company data.
• Work with cross-functional teams to provide feedback, drive improvements, and raise the bar for engineering excellence.

• Innate curiosity and a strong passion for quality engineering.
• Professional experience as an SDET, QA Automation Engineer, or Software Engineer with a focus on testing.
• Strong experience with Python (test automation, scripting, or backend validation).
• Familiarity with SQL for data validation.
• Experience in one or more of the following is a strong plus:
• Distributed systems testing
• Kubernetes-based test environments
• Messaging technologies (Jetstream NATS, Redis, etc.)
• Load/performance testing tools (Locust, JMeter, Gatling, etc.)
• A pragmatic, hands-on approach to solving complex problems.
• Solid understanding of algorithms, data structures, databases, and distributed systems.

Passion for building automation-first testing cultures, minimizing manual work wherever possible.

• Full-time salary based on experience with meaningful equity in an industry-leading company.
• This is a hybrid role based in our London office, with a mandatory in-office presence four days per week.
• Work from Anywhere Policy: you can work remotely from anywhere in the world for up to 20 days per year.
• Class Pass
• Unlimited vacation policy; work hard and take time when you need it.
• Opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field.

Blockchain is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law.

For privacy and data processing related to recruitment, Blockchain may share data with service providers as necessary to manage the recruitment process. You may contact our Data Protection Officer by email at

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