Sergey Volkov

Frontend Engineer

Berlin, Berlin, Germany7 yrs experience

Most Likely To Switch

Key Highlights

Led development of key B2B SaaS features.
Achieved significant performance optimizations.
Mentored teammates and shaped team workflows.

Stackforce AI infers this person is a Senior Frontend Developer specializing in Fintech and SaaS solutions.

Contact

Skills

Core Skills

ReactTypescriptChart.jsGraphqlWebsocketNext.js

Other Skills

Ant DesignCode Review & Quality AssuranceCypressHTML5JavaScriptJestMicro-frontendsNextOAuth 2.0Performance OptimizationRTK QueryReact QueryReactJSReduxRedux Toolkit

About

Senior Frontend Developer with 6+ years of experience in building B2B and SaaS platforms for fintech, e-commerce, and analytics. Specialized in architecture design, performance optimization (TTI, bundle size), and developing complex modules - from real-time dashboards to payment solutions. Set up CI/CD pipelines to ensure stable releases and built UI kits that accelerated development and improved interface consistency. Frequently took on lead responsibilities: mentoring teammates, introducing best practices, and helping to shape team workflows. Contact me: 📩 Telegram: @srgy_dev 📩 Email: srgy.dev@gmail.com

Experience

Exact

Senior Frontend Developer

Apr 2023 – Present · 2 yrs 11 mos · Delft, Netherlands · Remote

Exact (Delft, The Netherlands) - leading provider of B2B finance, accounting and analytics software.
Led the development of a new reporting module for corporate clients including KPMG and Deloitte, reducing report generation time by 40%
Improved performance with code splitting, lazy loading and dynamic chart rendering, decreasing TTI by 38%
Built an interactive data visualization system using Chart.js and custom React hooks, helping analysts cut manual data processing by 20%
Migrated architecture from CRA to Vite with SWC, reducing build time from 10 to 4 minutes
Configured micro-frontend architecture with Webpack Module Federation to enable cross-app component sharing
Tech stack: React, TypeScript, Next.js, Vue.js, Redux Toolkit, Micro-frontends, WebSockets, GraphQL
Chart.js, Jest, Cypress

ReactTypeScriptNext.jsVue.jsRedux ToolkitMicro-frontends+5

Teamleader

Senior Frontend Developer

Apr 2021 – Mar 2023 · 1 yr 11 mos · Ghent, Flemish Region, Belgium · Remote

Core development for Teamleader B2B SaaS (CRM, invoicing, project management)
Helped scale a European SaaS platform used by 20k+ businesses. Drove key billing and payment features, focused on reliability and user value.
Key results:
Delivered the invoicing engine with dynamic forms, tax logic for 5+ countries, and PDF export - halved the manual workload for clients.
Implemented real-time notifications via WebSocket/SSE: users react to payment or status changes instantly, support load down by 40%.
Integrated Stripe and Adyen for seamless payments, secured token flows, and automated payment status sync.
Migrated legacy codebase from classes to hooks, reducing bugs and unlocking faster releases.
Set up automated tests and Cypress e2e, improved regression coverage.
Audited and improved dev experience: split environments, feature flags, local builds 2x faster.
Tech stack: React, TypeScript, Next.js, Vue.js, Redux, GraphQL, Micro-frontends, WebSocket,
Ant Design, Jest, Cypress, Vite

ReactTypeScriptNext.jsVue.jsReduxGraphQL+6

Isimplelab

Frontend Developer

Jan 2019 – Mar 2021 · 2 yrs 2 mos · Moscow, Russia · Remote

Development of the B2B platform “SBIS”: document management, CRM, accounting, reporting
Built a new partner portal: SSR with Next.js 3 and modular frontend architecture
Implemented role-based access control, custom forms, and complex UI components
Created a custom UI kit with unified styles and reusable blocks
Integrated OAuth 2.0 via Keycloak: route protection and token auto-refresh
Optimized the build process: improved FCP/TTI metrics and reduced bundle size
Boosted CI speed by 30% using smart caching and faster builds
Write automated tests for critical paths (Jest, Cypress); actively perform code reviews

Next.jsOAuth 2.0JestCypress