Senior Java Engineer, Trading Platform

Bullish, Inc.; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Bullish, Inc. is seeking a Senior Engineer for Trading Product Engineering in London. You will design and deliver low-latency Java code powering the Bullish Exchange, working across a hybrid architecture that blends a Central Limit Order Book with proprietary market making.

You will optimize performance, expand automated testing, and collaborate with cross-functional teams to ensure reliability in high-throughput trading environments.

Qualifications

• Strong Java (17+) fluency with performance tuning.
• Track record of designing and building high-throughput, low-latency systems.
• Hands-on experience with agentic AI development: LLM integration, prompt engineering, and SDLC automation.
• Solid understanding of middleware and messaging technologies such as Chronicle Queue, RabbitMQ, Aeron, and Kafka.
• Working knowledge of Spring or Micronaut, Docker, and Kubernetes.
• Deep knowledge of testing methodologies, SDLC practices, and CI/CD pipelines.
• Ownership of the components the Exchange depends on.

Responsibilities

• Design and deliver reusable, reliable, low-latency Java code powering the Exchange.
• Raise the bar on code quality, organization, and automation as the system scales under load.
• Profile and resolve performance bottlenecks in the order-processing path.
• Improve stability through automated tests at unit, integration, and performance levels.
• Collaborate across a distributed team of engineers, product managers, and project managers.

Skills

Java 17+

Performance tuning

AI development

Middleware messaging

Chronicle Queue

RabbitMQ

Aeron

Kafka

Spring

Micronaut

Docker

Kubernetes

CI/CD

Testing methodologies

SDLC practices

Ownership

Tools

Docker

Kubernetes

Spring

Micronaut

Job description

Bullish, Inc. is seeking a Senior Engineer for Trading Product Engineering in London. You will design and deliver low-latency Java code powering the Bullish Exchange, working across a hybrid architecture that blends a Central Limit Order Book with proprietary market making.

You will optimize performance, expand automated testing, and collaborate with cross-functional teams to ensure reliability in high-throughput trading environments.