Senior Engineer, Custody Engineering

Reports to:

Join our Custody and Payments (CAP) Engineering Team—a diverse group of engineers dedicated to building and enhancing the critical services that support the custodial requirements of a major crypto exchange undergoing significant growth. We work closely with our security teams to ensure that client funds remain secure at all times. Our primary mission is to facilitate safe, secure, and regulatory compliant fund movements between our clients and the Bullish platform.

The Role

We are seeking a creative and detail-oriented Full Stack Developer who excels at building dynamic, end-to-end user experiences using React and Java. In this role, you will design and implement both high-performance user interfaces and robust backend services, all thoroughly tested through automation and observing security considerations end-to-end. The scope of the work spans Java microservices, web UIs, and hybrid mobile applications, offering you the opportunity to impact a rapidly growing ecosystem.

Role & Responsibilities:

• UI Development: Design, build, test, and maintain reliable React components for both web and mobile platforms.

• Backend Services: Develop new Java-based microservices and integrate them with our existing API landscape.

• Implementation: Translate design wireframes and prototypes into efficient, production-ready code.

• Testing: Write comprehensive unit, integration and end to end tests using tools such as Jest, React Testing Library and Playwright to ensure the reliability of user interfaces.

• Cross-functional Engagement: Work closely with UX/UI designers, product managers, and global engineering teams to deliver features that delight our users.

• Agile Practices: Actively participate in agile ceremonies including sprint planning, daily stand-ups, reviews, and retrospectives.

Experience & Qualifications

Technical Skills:

• Java/UI Engineering: A minimum of 5+ years of experience as a Java/UI engineer.

• Frontend Expertise: Strong proficiency in React, including hooks, state management (e.g., Redux or Context API), and component life cycles.

• Core Web Technologies: In-depth knowledge of HTML, CSS (or CSS-in-JS), and modern JavaScript (ES6+), with experience in responsive design and mobile-first application development.

• Backend Proficiency: Expertise in Java (Java 17+) and familiarity with key JDK packages such as Java Collections.

• Frameworks & Tools: Hands-on experience with popular Java frameworks such as Spring Boot or Micronaut, along with testing tools like JUnit and Mockito.

Development Practices:

• Test-Driven Development: Strong understanding and practical application of TDD, with experience in writing unit, integration, and end-to-end tests.

• Tool Proficiency: Familiarity with git, Docker, Kubernetes, JIRA, and Confluence.

• API Design: Strong knowledge of API design, development, and secure coding best practices.

• DevOps Experience: Experience with CI/CD pipelines and DevOps practices.

Bonus:

• Experience in the crypto space.

• Understanding of application level network security.

• Previous exposure to traditional financial services.

Bullish is proud to be an equal opportunity employer. We are fast evolving and striving towards being a globally-diverse community. With integrity at our core, our success is driven by a talented team of individuals and the different perspectives they are encouraged to bring to work every day.