Do you thrive on precision and enjoy solving complex problems? Are you excited by the challenge of ensuring data correctness at scale? Join KOR, a VC-backed fintech innovating financial markets with cutting-edge solutions for regulatory trade reporting.<h4>About us</h4>We are a VC backed fintech with a live product in the regulatory trade reporting space&nbsp;and growing list of institutional&nbsp;clients.&nbsp; Our product journey has started in the US with expanded services covering Canada, UK, EU, Australia and Singapore.&nbsp; If you want to join a scale-up that is going to provide growth and ownership, keep reading.KOR is built on leading-edge cloud technology by industry domain experts and world-class in-house engineering. We're on a mission to innovate B2B trade servicing starting with regulatory reporting in time for a global wave of mandated changes hitting all segments of market participants across OTC derivatives transactions. We’re solving the most challenging problems around by bringing fresh designs and solutions to data utility, quality, and processing inefficiencies. . . while unlocking insane value for clients.Teamwork and laser focus are central to everything we do at KOR. With the right support, we believe small independent teams with deep expertise achieve better results and encourage skilled people to take responsibility and grow their careers. We live by the mantra of work humble, work smart, and work together.<h4>About you</h4>You have a passion for high-quality, reliable, and maintainable code. You're agile, embrace feedback, and are not afraid to identify what we're doing wrong so we can fix it and what we're doing right to improve on it. Above all, you judge your success by the success of your team and the happiness of our customers.<h4>About the role</h4>As a Backend Engineer in our Validator Team, you'll focus on maintaining and enhancing our custom-built validator engine. This system ensures regulatory messages sent to financial regulators meet stringent accuracy requirements. The engine uses a JSON-based DSL for both production rules and integration test scenarios, encompassing over a million hand-written test cases.This role involves:<ul><li>Configuring and maintaining the validator engine to meet jurisdictional requirements.</li><li>Extending the rules engine (written in Java) to support new use cases.</li><li>Implementing, debugging, and refining JSON-based DSL rules for accuracy and compliance.</li><li>Using Claude Code and other AI tools responsibly to boost productivity.</li><li>Collaborating with other team members to support ten jurisdictions.</li><li>Ensuring thorough testing and validation of all configurations.</li></ul>

Remote Eastern Europe Timezone (Poland)

Can you provide a link to your LinkedIn profile?

Have you practiced pair programming before?

Do you have experience with the Kafka Streams library, and its low-level processor API?

Yes, but only Kafka Streams high-level DSL

KOR is not in the position to provide work visa. Do you require sponsorship?

In which country are you physically located?

We are an experienced team of Spring committers, Kafka contributors, ex-Pivotal, and ex-Google engineers. If you want to know more, keep reading or reach out for a chat.

Backend Engineer – Validator Engine Specialist (Poland)