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Backend Engineer – Validator Engine Specialist

· Job Posted December 09, 2025
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Job Description

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. 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 800,000 test cases.

Job Responsibility

  • Configuring and maintaining the validator engine to meet jurisdictional requirements
  • Extending the rules engine (written in Java) to support new use cases
  • Implementing, debugging, and refining JSON-based DSL rules for accuracy and compliance
  • Collaborating with three other team members to support ten jurisdictions
  • Ensuring thorough testing and validation of all configurations

Requirements

  • Bachelor's Degree or higher in Engineering, Computer Science, or Information Technology
  • Residing in or near the CET time zone (including Eastern Europe)
  • A minimum of 3+ years of experience as a Backend Engineer
  • Experienced with Java and Spring Boot Framework
  • Demonstrating a firm reliance on unit testing and mocking frameworks
  • Self-motivated and take ownership of their work
  • Detail-oriented perfectionists who take pride in covering all their bases
  • Energized by solving repetitive, complex problems systematically
  • Open to coaching by senior engineers with deep experience
  • Excellent communicators with strong English skills
  • Assertive team players who value collaboration
  • Passionate for delivering high-quality, maintainable code

Nice to have

Prior experience with DSLs or regulatory systems

What we offer

  • Mentorship by senior engineers with experience at companies like Pivotal and VMware
  • The chance to join a rapidly growing team with the opportunity to move into the broader engineering organization
  • A collaborative, remote-friendly environment
  • Culture of trust, empowerment, and constructive feedback
  • Competitive salary, great IT equipment, and expense allowance
  • Flexible working times
  • A span of control that matches your ambitions and skills
  • Commitment to a genuine, balanced relationship

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