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Senior Software Engineer (JVM/Kotlin)

hyperexponential.com Logo

hyperexponential

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Location:
Poland , Warsaw

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Category:
IT - Software Development

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Contract Type:
B2B

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Salary:

Not provided
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Job Description:

Senior Backend Engineer in the Policies team, leading the architectural transformation of core domain while delivering new features that expand product capabilities. Architecting the evolution from monolith to modular systems, implementing Domain-Driven Design and hexagonal architecture patterns to shape how we scale for the next phase of growth.

Job Responsibility:

  • Lead architectural modernisation of core business systems, driving the transition from monolith to modular architecture using Domain-Driven Design principles that enable faster development and better system maintainability
  • Design and deliver complex business logic in Kotlin, Spring, and Hibernate, building robust systems that handle intricate insurance domain models and maintain data integrity for billions in premiums
  • Shape technical strategy and standards across the team and broader engineering organisation, driving decisions around system design, code quality, and architectural patterns that other teams will follow
  • Collaborate with product stakeholders to translate complex business requirements into elegant technical solutions, working directly with product managers, designers, and sometimes customers to ensure we're solving the right problems
  • Mentor and influence engineering culture by establishing coding standards, leading technical discussions, and helping other engineers grow their architectural thinking and technical skills
  • Drive operational excellence through participation in on-call rotations and building systems that maintain high availability for our mission-critical platform used by enterprise customers worldwide

Requirements:

  • Architected and delivered complex backend systems with proven experience leading technical initiatives in Kotlin or other JVM languages, ideally with hands-on knowledge of Spring, Hibernate, or similar enterprise frameworks
  • Led architectural transformation projects with demonstrable success modernising legacy systems, implementing Domain-Driven Design, or breaking down monoliths into maintainable, modular architectures
  • Influenced technical strategy across teams by driving architecture decisions, establishing coding standards, and mentoring other engineers in best practices that improved system quality and development velocity
  • Built business-critical systems that handled complex domain logic and data integrity requirements, ideally in industries like finance, insurance, or other domains where system reliability directly impacts business outcomes
  • Collaborated effectively with product teams to deliver features that customers actually use, with evidence of translating business requirements into technical solutions that drive measurable impact
  • Demonstrated senior-level ownership by taking responsibility for system reliability, participating in on-call rotations, and building the operational practices that keep production systems running smoothly
What we offer:
  • Share Options at a highly successful Series B company
  • 25 days of non-working + 14 Polish bank holidays (B2B) / 26 days of holiday + 14 Polish bank holidays (UoP)
  • £5,000 budget for Learning & Development
  • Mental Health Support and Therapy via Spectrum Life
  • Optional for you: access to Healthcare package provided by Luxmed + Multisport (fully funded by yourself as B2B Contractor)
  • Top-spec laptop (MacOS or Windows)
  • Company pension (UoP)
  • 10 days company sick pay at 100% salary, thereafter in line with labour law (UoP)
  • Monthly wellbeing allowance via Juno (UoP)
  • Healthcare package provided by Luxmed (UoP)
  • Multisport card at Classic level (UoP)
  • Top-spec work equipment (MacOS / Windows + additional monitors, mechanical keyboards etc)

Additional Information:

Job Posted:
December 09, 2025

Employment Type:
Fulltime
Work Type:
Hybrid work
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