Senior Backend Engineer
hyperexponential2 months ago
Warsaw, PolandSenior
Responsibilities
- Design, build, operate, and own backend services in Kotlin or Java in production.
- Turn ambiguous underwriting problems into simple, reliable software and determine the highest-value problems to solve.
- Shape APIs, domain models, persistence, reliability, observability, and long-term platform architecture.
- Build expertise in the underwriting domain and challenge requirements when appropriate.
- Design and build agent-assisted workflows while determining where agents act, advise, or defer to humans.
- Use AI coding tools including Claude while remaining accountable for code quality, security, and correctness.
- Collaborate with frontend engineers, product partners, client-facing teams, and underwriters.
- Give and receive direct feedback and help raise the engineering bar.
Requirements
- Strong professional experience building and running backend systems in Kotlin, Java, or another JVM language.
- Sound judgment in architecture and system design, including prioritization and long-term technical tradeoffs.
- Evidence of shipping software that solved a real customer or business problem, ideally with end-to-end ownership.
- Self-directed approach to identifying and solving high-value problems.
- Clear communication with underwriters, executives, and engineers.
- Comfort working on ambiguous problems without established precedents.
- Responsible and critical use of AI coding tools.
- Receptiveness to frequent direct feedback.
- Experience in insurance, underwriting, or another complex regulated domain is helpful but not required.
- Experience across backend and frontend is helpful but not required.
- Experience building workflow, decision-support, or agent-assisted products is helpful but not required.
- Experience working directly with enterprise clients is helpful but not required.
Benefits
- B2B contractor arrangement is available.
- Share options at a highly successful Series B company.
- 25 days of non-working time plus Polish bank holidays for the B2B arrangement.
- £5,000 GBP learning and development budget.
- Mental health support and therapy via Spectrum Life.
- Optional self-funded private healthcare via Luxmed and Multisport for B2B contractors.
- Top-spec laptop with MacOS or Windows.
- Contract of Employment (UoP) option.
- 26 days of holiday plus Polish bank holidays for the employment arrangement.
- Company pension and company sick pay for 10 days at 100% salary.
- Monthly wellbeing allowance via Juno.
- Private healthcare insurance via Luxmed and Multisport Classic.
- Top-spec work equipment including additional monitors and mechanical keyboards.
Categories
About hyperexponential
hyperexponential builds an AI-driven underwriting and pricing platform for commercial property and casualty insurers, used by underwriters, actuaries, and portfolio leaders. The SaaS system governs decision logic, models complex risks, and plugs into carrier workflows; top global carriers use it for underwriting decisions across $75B+ in annual premium. Founded in 2017 and headquartered in London, the company is privately held.