Software Engineer (Kotlin), Institutional

Blockchain is the worlds leading software platform for digital assets. Founded in 2011 we provide the worlds 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 are looking to hire a Software Engineer to join our Institutional team in our London office. is a high-performance culture marked by fearlessness and hyper productivity. You are a hardworking team player with a desire to learn and grow with us someone who can work harder faster and smarter to deliver tangible results and process improvements.

WHAT YOU WILL DO

• Design and implement scalable secure and high-performance backend services in Java/Kotlin that power client-facing applications for trading custody and wealth management.
• Build robust APIs and microservices to support advanced dashboards analytics tools and mobile experiences.
• Collaborate closely with front-end engineers product managers and designers to deliver seamless intuitive experiences for sophisticated investors.
• Architect solutions for portfolio management trade execution settlement reporting and analytics tailored to institutional and private clients.
• Optimize backend systems for low latency high throughput and fault tolerance.
• Integrate security best practices and advanced encryption to safeguard sensitive financial data.
• Continuously improve backend performance reliability and development workflows.

WHAT YOU WILL NEED

• Strong hands-on experience with Kotlin in backend and distributed systems development.
• Proven expertise building scalable APIs microservices and backend platforms for complex financial or data-intensive applications.
• Familiarity with cloud deployments and service-oriented architectures.
• Knowledge of messaging and streaming technologies (NATS Kafka or similar).
• Solid understanding of algorithms data structures databases and distributed systems.
• Knowledge of ledger systems is a strong plus.
• Passion for solving challenging technical and financial problems with clean maintainable code.
• Commitment to quality-driven engineering with a strong focus on testing (unit integration performance and failure recovery).
• Experience in fintech trading or wealth management platforms is a strong advantage.

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 three days per week.
• Work from Anywhere Policy: You can work remotely from anywhere in the world for up to 20 days per year.
• ClassPass
• Budgets for learning & professional development
• Unlimited vacation policy; work hard and take time when you need it
• Apple equipment
• The opportunity to be a key player and build your career at a rapidly expanding global technology company in an emerging field
• Flexible work culture

#LI-Hybrid

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 Controllers 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 Controllers 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.

Your personal data will be retained by Controller as long as Controller determines it is necessary to evaluate your application for employment. Under the GDPR you have the right to request access to your personal data to request that your personal data be rectified or erased and to request that processing of your personal data be restricted. You also have the right to data addition you may lodge a complaint with an EU supervisory authority.