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Sergii Prostov

Senior Frontend Engineer specializing in React and enterprise SaaS

Ottawa, ONSenior Frontend Engineer13 years experienceSeniorInsuranceFinancial ServicesHealthcare IT
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About

Frontend engineer in an insurance SaaS white-label environment who transformed a fragmented ecosystem of 100+ duplicated React repos into a scalable platform using versioned NPM libraries (CommonWeb/WorkflowWeb). Built a JSON-driven, multi-step quote and payment workflow in React+TypeScript with Redux-Saga for complex async orchestration and reliability (idempotency, retries, takeLatest). Delivered measurable impact: 35% bundle reduction, onboarding cut from weeks to days, and bug fixes propagated across clients in hours.

Experience

Senior Frontend EngineerInsureGo
Software Development Engineer IIIOracle
Product Developer (CDO, Co-Founder)BusyTable
Senior Front-End DeveloperExadel
Front-End DeveloperJonny.Git
Senior UX/UI SpecialistPeriscope by McKinsey
Chief Design Officer (Co-Founder)Impact Factors

Education

Woolf University (GoIT Neoversity)master, Computer Science, Machine Learning and Data Science
DITS – Deutsche IT Schulebootcamp, Full Stack Development
National Technical University of Ukraine “Kyiv Polytechnic Institute”bachelor, Management

Key Strengths

  • Architected shared frontend via versioned NPM libraries to eliminate duplication across 100+ white-label repos
  • Strong architectural trade-off analysis using explicit criteria (maintenance, deployment independence, version control, team workflow)
  • Built scalable React+TypeScript insurance quote workflow with complex async orchestration (Redux-Saga) and third-party integrations
  • Designed clean separation of concerns (config/engine/component library) enabling parallel work across BAs, designers, and developers
  • Improved performance with tree shaking and code splitting; reduced bundle size by 35%
  • Accelerated delivery: cross-cutting feature development 3–4x faster; bug-fix propagation reduced from days to hours
  • Operational excellence for high-stakes launches: embedded QA early, staged rollout with feature flags, rapid iteration from monitoring

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Languages

English

Skills

JavaScriptTypeScriptReactReduxRedux-SagaVuePreactNext.jsBackbone.jsEmber.jsjQueryElectronHTML5CSS3SCSS