Software Engineer

We are looking for a Backend Software Engineer to join the Treasury Ledger team. Every time money moves at Wise, Treasury needs to know where it is and in which currency. Our team builds the ledger that answers that question: a real-time, accurate view of Wise's FX position and liquidity. This is high-volume, event-driven infrastructure where correctness matters. Your work directly supports how Treasury manages Wise's money, and the evolution of the ledger as the business grows.

What will you be working on?

• Build new specialised ledgers that track Wise's FX risk and liquidity in real time, using modern stream-processing technology.
• Design real-time reconciliation and data-quality controls that catch discrepancies as they happen, not days later.
• Bring new Wise products into the ledger as they launch around the world, giving Treasury a complete picture of money moving across products and currencies.
• Scale the real-time event processing at the heart of Treasury, keeping it fast, resilient and observable as Wise grows.

Technical responsibilities

• Own features end-to-end, from the product events Wise's systems produce to the real-time ledger streams Treasury relies on, working alongside experienced engineers.
• Help shape the architecture of new ledgers through design discussions and code reviews.
• Solve hard distributed-systems problems at scale: exactly-once processing, event ordering, replay and real-time aggregation.
• Build with a modern stack: Java 25, Spring Boot, Apache Kafka, Apache Flink, MariaDB and ClickHouse.
• Use AI tooling across the development lifecycle to move faster without compromising quality.

What do you need? We are fully aware that it is uncommon for a candidate to have all skills required and we fully support everyone in learning new skills with us. So if you have some of those listed below and are eager to learn more we do want to hear from you! Technical excellence

• Solid software engineering fundamentals and experience building backend software professionally.
• Experience with Java or a similar object-oriented programming language.
• Good understanding of databases and SQL.
• Care for data correctness and attention to edge cases.
• Writing well-tested, maintainable code.
• Willingness to learn new technologies and domains.

Ownership and product mindset

• Ownership of your work from design through production.
• Understanding why something is being built and what problem it solves.
• Curiosity about how FX, liquidity and accounting work.
• Willingness to take part in incident resolution and post-incident learning.
• Participation in on-call support for your area when needed.

Influence and collaboration

• Communicate clearly with engineers, analysts and business stakeholders.
• Ask questions, share knowledge, and give and receive feedback openly.
• Contribute to engineering communities or guilds across Wise.

Nice to have

• Experience with Kafka, Flink or other stream-processing technologies.
• Experience with analytical databases such as ClickHouse.
• Experience with event-driven or data-intensive systems.
• Interest or experience in payments, banking, accounting or another financial domain.