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Sergii Prostov

Senior Frontend Engineer specializing in React and enterprise SaaS

InsureGoWoolf UniversityOttawa, ON13 Years ExperienceSenior Level

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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.

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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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Experience

Senior Frontend EngineerInsureGo · Dec 2022 – Present
Software Development Engineer IIIOracle · Jan 2022 – Feb 2025
Product Developer (CDO, Co-Founder)BusyTable · May 2019 – Jan 2022
Senior Front-End DeveloperExadel · Jan 2020 – Mar 2021
Front-End DeveloperJonny.Git · May 2018 – Jan 2020
Senior UX/UI SpecialistPeriscope by McKinsey · Jan 2016 – Jan 2018
Chief Design Officer (Co-Founder)Impact Factors · Aug 2011 – Jan 2017

Education

Woolf Universitymaster, Computer Science, Machine Learning and Data Science
Deutsche IT Schulebootcamp, Full Stack Development
National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"bachelor, Management

Languages

English

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Sergii ProstovSenior Frontend Engineer specializing in React and enterprise SaaS