Senior Backend Engineer - Kotlin/Java for Insurance

Hyperexponential; Warszawa; On-site; PLN 368,000 - 631,000; Full time

Benefits offered by this job

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Learning budget

Mental health support

Private healthcare

Multisport

Laptop provision

Job summary

Hyperexponential builds an AI-powered insurance pricing and underwriting platform. You will contribute from day one to the Workflow Underwriting stream, designing backend services, shaping domain models, and implementing agent-assisted workflows.

You’ll work with senior engineers, product partners, and client teams to deliver reliable, scalable software that insurers rely on for fast, informed decisions. Expect high impact and ongoing learning in a fast-paced environment.

Qualifications

• Experience building and running backend systems in Kotlin/Java.
• Strong architectural judgment and system design skills.
• Proven track record shipping software that solves real problems.
• Self-starting, proactive problem finder.
• Clear, adaptable communication with diverse stakeholders.
• Comfort with ambiguous problems and no precedent.
• Responsible use of AI coding tools.
• Willingness to give and receive feedback.

Responsibilities

• Design, build, and operate backend services in Kotlin or Java, and own them in production.
• Turn ambiguous underwriting problems into simple, reliable software.
• Shape architectural decisions: APIs, domain models, persistence, reliability, observability.
• Build depth in underwriting domain and challenge requirements.
• Design and build agent-assisted workflows with human-in-the-loop decisions.
• Use AI coding tools as a core part of work, while ensuring quality and security.
• Collaborate across frontend, product, and client teams.
• Provide direct feedback to raise the engineering bar.

Skills

Kotlin/Java backend

System design

Shipping software

Self-starting

Communication

Problem solving

AI coding tools

Feedback

Tools

Claude

Job description

Hyperexponential builds an AI-powered insurance pricing and underwriting platform. You will contribute from day one to the Workflow Underwriting stream, designing backend services, shaping domain models, and implementing agent-assisted workflows.

You’ll work with senior engineers, product partners, and client teams to deliver reliable, scalable software that insurers rely on for fast, informed decisions. Expect high impact and ongoing learning in a fast-paced environment.