Senior Software Engineer (Java, Go) (IR-519)

We’re modernizing the customer's platform by replacing legacy systems with a new architecture based on Go, NATS, Redis, and Postgres, while continuing to support and integrate with an existing Java/Spring and RabbitMQ ecosystem. You’ll contribute across both modern Go services and legacy Java platforms, helping to bridge existing systems, drive modernization efforts, and gradually replace older infrastructure with scalable, high-performance solutions.

We’re hiring a Senior Engineer to design and develop the exchange and liquidity provider (LP) adapters - the core integration layer connecting our trading platform to external venues.

In this role, you’ll work at the intersection of:

- trading workflows, including RFQ, quoting, and execution;

- real-time market data systems;

- external connectivity via REST, WebSocket, and FIX APIs.

• Strong experience in Java and/or Go (you’ll use both);
• Experience building API integrations (REST, WebSocket; FIX is a big plus);
• Deep understanding of concurrency and performance;
• Familiarity with event-driven systems (Kafka, NATS, RabbitMQ, etc.);
• Strong debugging skills in distributed systems;
• Trading / Domain experience (highly preferred): exchanges (crypto or TradFi), liquidity providers / market makers, RFQ or order execution flows; understanding of order lifecycles, latency and sequencing challenges, market data feeds;
• Systems thinking - you're comfortable working with unreliable external systems, messy APIs and real-world edge cases;

Nice to have skills

• Experience working with the FIX protocol
• Background in crypto trading infrastructure or exchange integrations
• Familiarity with Redis, Postgres, and NATS
• Experience modernizing or migrating legacy systems to newer architectures
• Exposure to low-latency and high-throughput distributed systems

Responsibilities:

• Build and maintain exchange and LP adapters using REST, WebSocket, and FIX
• Normalize external venue APIs into canonical internal models
• Develop low-latency, fault-tolerant services for RFQ, execution, and market data flows
• Handle venue-specific edge cases including partial fills, sequencing, and inconsistent APIs
• Integrate with an event-driven stack using NATS JetStream, Redis, and Postgres
• Work across modern Go services and legacy Java/Spring systems
• Contribute to migration efforts from RabbitMQ to NATS and monoliths to microservices
• Improve resiliency, observability, and operational reliability across the platform
• Collaborate with trading, product, and infrastructure teams

• Awesome projects with an impact
• Udemy courses of your choice
• Team-buildings, events, marathons & charity activities to connect and recharge
• Workshops, trainings, expert knowledge-sharing that keep you growing
• Clear career path
• Absence days for work-life balance
• Flexible hours & work setup - work from anywhere and organize your day your way