Software Development Engineer in Test

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.

WHAT YOU WILL DO

• Design and build automated test frameworks and tools for low-latency, high-throughput trading services.
• Develop, maintain advocate test suites across the full product lifecycle:
  • 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 closely with cross-functional teams to provide feedback, drive improvements, and raise the bar for engineering excellence.

WHAT YOU WILL NEED

• 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.

COMPENSATION & PERKS

• Full-time salary based on experience and 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.
• ClassPass
• Unlimited vacation policy; work hard and take time when you need it
• The 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. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. Blockchain makes hiring decisions based solely on qualifications, merit, and business needs at the time.

You may contact our Data Protection Officer by email at . Your personal data will be processed for the purposes of managing Controller's recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment.

Your personal data will be shared with Greenhouse Software, Inc., a cloud services provider located in the United States of America and engaged by Controller to help manage its recruitment and hiring process on Controller's behalf. Accordingly, if you are located outside of the United States, your personal data will be transferred to the United States once you submit it through this site. Because the European Union Commission has determined that United States data privacy laws do not ensure an adequate level of protection for personal data collected from EU data subjects, the transfer will be subject to appropriate additional safeguards under the standard contractual clauses.

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