Анатолій

Anatolii Halkevych
Full-Stack Software Engineer | React, TypeScript, Node.js, NestJS | Ukraine, open to remote

Summary
Full-Stack Software Engineer with 2.5 years of commercial experience building production web applications with React,
TypeScript, Node.js and NestJS. Most recently spent 1.5 years on a US HealthTech/FinTech platform: a large Nx monorepo with
four React portals and a gRPC microservices backend, handling recurring card and ACH billing through Stripe and Stripe
Connect.
Strong in frontend architecture and modernization (React 18, Redux-Saga, React Hook Form, MUI, design systems), payment
flows, and end-to-end production debugging with AWS CloudWatch, Datadog and Sentry. Comfortable across the stack: NestJS,
gRPC/Protobuf, MySQL, PostgreSQL, Docker, GitHub Actions and AWS. Experienced in AI-assisted development with Claude
Code. Advanced English; used to working with US clients in Agile/Scrum teams.
Email: [відкрити контакти](див. вище в блоці «контактна інформація»)

Experience

Full-Stack Developer | FreshCode | 1 year 6 months
US HealthTech/FinTech client (NDA), team of 10. US dental membership platform that lets dental practices sell in-house
membership plans to patients and employers as an alternative to insurance. Covers practice onboarding, plan configuration,
enrollment, recurring card/ACH billing, refunds, Apple/Google Wallet membership cards and sync with dental Practice
Management Systems. Production system since 2017, 20,000+ commits per core repository.
Built and maintained features across 4 React portals (Member, Dentist, Employer, Super-Admin) in a large TypeScript Nx
monorepo with shared design-system, form and API libraries.
Implemented payment flows with Stripe Elements and Stripe Connect: card and ACH payment methods, past-due
payments, refunds and plan cancellation.
Took part in frontend modernization: migrated forms from redux-form to React Hook Form + Yup, and styling from MUI
v4/makeStyles to the current MUI behind a shared in-house design system.
Resolved production and QA bugs end-to-end: root-cause analysis, regression tests proven to fail on the pre-fix code, and
browser verification. Fixed issues such as background refetches overwriting in-progress form edits, billing/refund edge
cases and empty-list crashes.
Investigated production incidents with AWS CloudWatch Logs, Datadog and Sentry.
Built internal Node.js CLI tools that export CloudWatch and Datadog logs, read AWS SSM Parameter Store and Secrets
Manager values, and pull Jira/Confluence data, speeding up debugging for the team.
Contributed to the backend: NestJS modules, gRPC contracts (Protobuf), MySQL/PostgreSQL via Sequelize and TypeORM,
and Pact consumer-driven contract tests.
Worked within a strict delivery process: Git Flow, code review, Conventional Commits with semantic versioning, lefthook git
hooks, CI quality gates (lint, typecheck, tests, coverage) and AI-assisted development with Claude Code.
Stack: React 18, TypeScript, Nx, Vite, Redux-Saga, Redux Toolkit, TanStack Query, React Hook Form, Yup, Zod, MUI, Emotion,
Storybook, Node.js, NestJS, Express, gRPC, MySQL, PostgreSQL, Redis, RabbitMQ, Stripe, AWS (ECS, Lambda, RDS, S3,
CloudFront), Docker, GitHub Actions, Datadog, Sentry, Playwright, Pact.

Frontend Developer | tenThousand | 5 months
Team of 9. Multi-portal digital banking platform split into four domain systems: investments, real estate transactions, fund
transfers, deposits, and letters of credit/guarantee for buyers and sellers.
Developed web (Next.js) and mobile (React Native) features in TypeScript for banking and investment workflows.
Built forms and reusable UI components with React Hook Form, Material UI, styled-components and Storybook; managed
state with Zustand.
Implemented multi-language support with react-i18next.
Analysed and clarified requirements, estimated tasks, wrote unit tests with React Testing Library and fixed bugs.
Stack: Next.js, React Native, TypeScript, Zustand, React Hook Form, MUI, styled-components, Storybook, react-i18next, React
Testing Library, Figma.

Full-Stack Web Developer | Freelance | 1 year
Team of 2. Platform where teachers create interactive English tests for schools and language courses, usable from any device.
Built the product end-to-end: React/TypeScript frontend, Express.js REST API and PostgreSQL database.
Turned Figma designs into a responsive UI with Material UI and Storybook; managed state with Zustand.
Owned requirements, estimation, build and deployment scripts, documentation and unit testing.
Stack: React, TypeScript, Zustand, React Hook Form, MUI, Storybook, Express.js, PostgreSQL, React Testing Library.

Full-Stack Web Developer | Intercode | 3 months
Team of 6. Online English-learning service with Student, Teacher and Admin roles, lesson scheduling, video calls, online tests,
vocabulary lists, email notifications and payments.
Built features on React/Redux frontend and Node.js/Express backend with MongoDB.
Integrated Jitsi video calls, LiqPay payments, Firebase, Nodemailer email notifications and WebSockets.
Took part in code review, unit testing and bug fixing.
Stack: React, TypeScript, Redux, Thunk, MUI, SCSS, Node.js, Express.js, MongoDB, WebSocket, Sentry.

Full-Stack Web Developer | ASD | 4 months
Team of 6. Marketplace where users list their items for sale.
Built authentication and registration, the product catalogue with search and sorting, and user profiles with listing creation.
Developed the REST API with Express.js and PostgreSQL; took part in code review and unit testing.
Stack: React, TypeScript, React Hook Form, MUI, Express.js, PostgreSQL, React Testing Library.

Skills
Languages: TypeScript, JavaScript (ES2022+), HTML5, CSS3/SCSS, SQL.
Frontend: React 18, Next.js, Redux, Redux Toolkit, Redux-Saga, React Context, Zustand, TanStack Query, React Hook Form,
Yup, Zod, Material UI (MUI), Emotion, styled-components, Storybook, Vite, Nx.
Backend: Node.js, NestJS (CQRS, Bull queues), Express.js, REST, JSON:API, gRPC, Protobuf, Sequelize, TypeORM.
Databases and messaging: PostgreSQL, MySQL 8, MongoDB, Redis, Snowflake, RabbitMQ, ActiveMQ.
Payments and integrations: Stripe.js, Stripe Elements, Stripe Connect, Twilio, Mailchimp/Mandrill, Google Maps API,
Apple/Google Wallet, Puppeteer.
Cloud and DevOps: AWS (ECS, ECR, Lambda, EC2, RDS, S3, CloudFront, CloudWatch, SSM Parameter Store, Secrets
Manager), Docker, Docker Compose, GitHub Actions, Jenkins.
Monitoring: Datadog, Sentry, AWS CloudWatch, Elastic APM.
Testing: Jest, React Testing Library, Playwright, Cypress, Pact (contract testing).
Practices and tools: Microservices, Agile/Scrum, Git Flow, Conventional Commits, code review, CI quality gates, Git, GitHub,
Jira, Confluence, Postman, Figma, Claude Code.

Education, languages, contacts
Education: Chernivtsi National University, Computer Science, Master's degree, 2017-2022
Languages: English (Advanced), Ukrainian (native)
Contacts: [відкрити контакти](див. вище в блоці «контактна інформація»), [відкрити контакти](див. вище в блоці «контактна інформація») github.com/Tolik9924