Dmitry Guzerchuk

Devscribed — React Native & Full-Stack Engineer

Remote. Two consumer subscription products, owned across mobile, web, backend and the AI layer. Superconscious — an app that clones the user’s voice and generates personalised audio sessions from it. Forma Pilates — a subscription video platform for a boutique pilates studio.

Mobile — React Native, TypeScript

• Owned both apps end to end: architecture, feature delivery, store submissions and post-release monitoring, with first-pass App Store approvals.
• Cut cold start by 45% and crash rate by 28% — lazy-loaded routes, deferred SDK initialisation, Hermes migration, and fixing the highest-volume Sentry issues.
• Built the media layer for both products: background and offline-cached audio, a resumable video class player, and gesture-driven UI with Reanimated 3 and Lottie.

Web — Next.js, React

• Shipped the Next.js web platform for both products: landing funnels, subscription checkout and account areas, with SSR / ISR on SEO-critical routes.
• Built the internal React admin for programs, classes and generated content; shared TypeScript types and API client between web and mobile.
• Server state in TanStack Query, UI state in Zustand, Zod validating API responses and form payloads at runtime.
• Improved Core Web Vitals, instrumented the funnel in Mixpanel and ran paywall and onboarding A/B tests.

Backend & Payments — Node.js, PostgreSQL

• Designed the REST API contracts for web and mobile: payload shape, versioning and error semantics.
• Built subscription billing end to end: in-app purchases and web checkout, receipt validation, entitlement sync, trials, renewals, cancellations and webhooks.
• Node.js / Express endpoints, PostgreSQL schema, queries and migrations; unit tests for payment logic (Jest, RNTL).

AI & Agents

• Claude-powered pipeline generating personalised session scripts → voice cloning and TTS, with queueing and failure recovery.
• MCP servers exposing internal APIs as tools, plus multi-step agent workflows with retries, validation and cost limits; cut inference cost via prompt caching, model routing and batching.

Stack: React Native, TypeScript, Next.js, React, Node.js, Express, PostgreSQL, Claude API, MCP, RevenueCat, TanStack Query, Zustand, Zod, Reanimated 3, Firebase, Codemagic, Mixpanel, Sentry

Performance Lab — React Native & Web Developer

Remote. Client mobile and web projects from specification to store release.

• Shipped 7 React Native apps to the App Store and Google Play across utilities, entertainment and real-money gaming, several from scratch.
• Real-money gaming: deposits and withdrawals, payment provider integration, verification onboarding, animation-heavy UI at 60 fps on mid-tier devices.
• React (Vite) and Next.js front-ends — landing pages, promo funnels, admin panels — with TanStack Query, SSR and a shared component library.
• Attribution and analytics SDKs (AppsFlyer, Facebook SDK, Sentry), campaign event schema, REST contracts with backend teams.

Stack: React Native, TypeScript, React, Next.js, Vite, Redux, Node.js, MongoDB, three.js, Reanimated, AppsFlyer, Sentry

Ethnamed — React Native & Frontend Engineer

Remote. A fintech mobile app plus affiliate-marketing platform work across mobile and web.

• Fintech app focused on secure transactions: transfers, card management, confirmation flows, biometric / PIN auth.
• Cross-platform apps for tracking offers on an affiliate-marketing platform.
• 6 React web interfaces — affiliate dashboards and landing pages.
• Tracking SDKs and REST APIs; Node.js endpoints for postbacks with the backend team; CI/CD setup.

Stack: React Native, React, TypeScript, Redux, Node.js, REST API, Axios, Firebase, React Navigation

Coral Team — React JS Engineer

React and React Native across multiple mobile and web products.

• Interfaces for 4 mobile and web products, reusable components adopted by the team.
• Salesforce Lightning Web Components for internal business tooling.
• REST APIs and third-party SDKs, code review, releases through Google Play.

Stack: React, React Native, JavaScript, Redux, Salesforce LWC, REST API, Firebase