Alexander MarfelFrontend Tech Lead / Team Lead

Experience

Roles, scope, and the work shipped to production — focused on delivery, quality, and reliability.

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Showing 9 of 9
Frontend Tech Lead / Team Lead · Vilavi
2024-10Present
Hybrid
Led frontend delivery for a multi-region product: Next.js App Router web shop, Vite-based user portal, and a shared frontend platform.
  • Built a shared frontend platform (UI kit, core packages, type-safe API SDK, unified tooling) used across multiple apps.
  • Introduced semver and a predictable release cadence for apps/packages (private registry publishing).
  • Designed CI/CD “single build → promote” across environments/regions to keep releases artifact-based and traceable.
  • Made CI checks (typecheck/lint/format) and build output tracking (bundle checks/metrics) part of the default delivery workflow.
  • Owned releases across dev/test/prod: frequent deployments, support, and post-release fixes.
  • Led planning, decomposition, code reviews, mentoring, and cross-team alignment (product/design/backend).
Next.jsReactTypeScriptViteRedux ToolkitCI/CDDocker
Senior Frontend Developer · Entangle
2023-122024-10
Remote
Shipped multichain dApp experiences (EVM + Solana) with a focus on transaction edge cases and release stability.
  • Delivered wallet connection and transaction flows (EVM + Solana) with clear UX states (loading/confirming/success/failure) and failure handling.
  • Handled edge cases via clearer error semantics, defensive UI states, and consistent data fetching patterns.
  • Partnered with product and backend to unblock releases and stabilize critical user journeys.
Next.jsReactTypeScriptRedux ToolkitWeb3
Senior Frontend Developer / Team Lead · BULAT
2023-102024-06
On-site / Hybrid
Launched a monitoring system frontend from scratch, focusing on modular architecture, real-time UX, and tooling that keeps changes reviewable and deployable.
  • Designed a modular FE structure with aliases and reusable base layers to keep complexity manageable.
  • Implemented a REST layer with Axios interceptors and centralized error mapping for consistent UI behavior.
  • Built a multi-socket WebSocket manager for real-time data and event-driven UI updates.
  • Set up Storybook and delivery tooling (lint/format hooks, containerization and Helm-ready deployment practices).
ReactTypeScriptRedux ToolkitRedux-SagaWebSocketStorybookDockerHelm
Senior Frontend Developer · TECHNAXIS
2022-122023-10
Remote
Built product UIs for 3D visualization and industrial calculators, focusing on performance, correctness, and maintainable UI architecture.
  • Implemented interactive 3D visualization (Three.js) and UI workflows for assembling and locating warehouse objects.
  • Delivered calculation-heavy web apps with validation and reporting, keeping logic testable and UI behavior consistent.
  • Shipped iteratively in small cross-functional teams with code review discipline.
ReactTypeScriptThree.jsRedux-SagaREST
Senior Frontend Developer / Team Lead · Adoriasoft
2022-022022-12
Remote / Hybrid
Launched an NFT marketplace from scratch: modular frontend architecture, Web3 integrations, and coordination across frontend/backend and product.
  • Designed a modular SPA architecture with clear domain boundaries and alias-based imports.
  • Implemented wallet integrations and Web3 SDK usage alongside REST/WebSocket APIs.
  • Led day-to-day frontend delivery: planning, reviews, and alignment with backend on API contracts and data models.
ReactTypeScriptReduxRedux-SagaWeb3WebSocketWebpack
Senior React Developer · ECN
2021-022022-02
Hybrid
Developed a broker client portal with TypeScript, REST/WebSocket integrations, and real-time UX for market data and notifications.
  • Built core UI modules and state management patterns for a complex, data-driven product.
  • Implemented real-time features via WebSocket for market updates and user notifications.
  • Improved reliability through typed API clients and consistent error handling.
ReactTypeScriptReduxRedux-SagaWebSocketREST
Frontend Developer · Koshelek.ru
2020-092021-02
Remote
Delivered service-level micro-frontends inside an SSR wallet platform with shared UI foundations and consistent integration patterns.
  • Shipped multiple micro-frontends (account, P2P, ads, chat) within a shared platform and UX baseline.
  • Built against SSR build targets (server/client/lib) and service registration via shared infrastructure.
  • Strengthened reliability with e2e coverage and standardized tooling/CI checks.
Vue 2SSRMicro-frontendsVuexWebpackCypressDockerHelm
Lead Frontend Developer · Sfxdx
2019-082020-09
On-site
Led frontend delivery for monitoring/admin systems in a crypto domain: architecture decisions, integrations, and mentoring in a microservices environment.
  • Delivered monitoring and admin UIs with REST/WebSocket integrations and state management patterns suited for operational screens.
  • Refactored and evolved existing apps to reduce technical debt while keeping release cadence steady.
  • Collaborated across a microservices ecosystem (Docker/Kafka/Auth0 context) and supported production releases.
ReactReduxRedux-SagaRESTWebSocketDockerKafka
Full Stack Developer · ERA
2018-062019-08
Novosibirsk
Built multiple products end-to-end: Java/Spring backend, web UIs (React/Redux), and occasional Android/Java delivery in small teams.
  • Implemented backend services with Spring/Hibernate and shipped MVPs for multiple business domains.
  • Built web UI modules with React/Redux and integrated REST APIs with predictable error handling.
  • Owned features through full SDLC: scoping, implementation, release, and support.
JavaSpringHibernateReactReduxRESTSQL