Senior Backend Engineer
hyperexponential2 days 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.
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