Олександр

OLEKSANDR BRATASHCHUK
Tech Lead / Full-Stack TypeScript Developer
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PROFILE
Tech Lead / Full-Stack TypeScript Developer with extensive commercial experience building fintech, banking, enterprise and AI-
enabled web products. Strong focus on frontend architecture and technical leadership, combined with hands-on full-stack
development using React/Next.js and Node.js/NestJS. Experienced in mentoring developers, code reviews, technical decision-
making, API integration, scalable UI architecture, testing, and delivery processes.

CORE SKILLS
Leadership: Technical leadership, frontend leadership, architecture, mentoring, code review, task decomposition, estimation,
delivery coordination, engineering standards.
Frontend: TypeScript, JavaScript, React, Next.js (App Router), Vite, TanStack Query/Table, Redux Toolkit, React Hook Form, Zod,
TailwindCSS, shadcn/ui, Ant Design, Material UI, Radix UI, Chakra UI, Storybook, HTML5, CSS/SCSS.
Backend & Data: Node.js, NestJS, Fastify, Express.js, Prisma ORM, Sequelize, PostgreSQL, MongoDB, Redis/Valkey, REST
APIs, S3, JWT/OAuth authentication.
Testing & DevOps: Jest, Vitest, React Testing Library, Cypress, Playwright, Docker, Docker Compose, GitHub Actions, CI/CD.

PROFESSIONAL EXPERIENCE
Frontend Lead / Frontend Developer May 2025 - Present
Core Banking Platform
 Lead frontend delivery for a configurable core banking platform covering accounts, transactions, lending workflows, customer
profiles, permissions, and operational dashboards.
 Own frontend architecture decisions, reusable component patterns, code-quality standards, pull-request reviews, task
decomposition, and technical implementation planning.
 Mentor frontend developers and collaborate with backend/product stakeholders on API contracts, feature design, security
requirements, and release planning.
Technologies: TypeScript, React, Next.js, TanStack Query, TanStack Table, React Hook Form, Zod, Ant Design, Redux Toolkit,
Storybook, Jest, React Testing Library, Cypress, REST APIs
Frontend Developer Feb 2024 - Apr 2025
Enterprise Tendering & Procurement Platform
 Developed an enterprise procurement platform covering supplier management, bidding workflows, capacity tracking, reporting,
and data-heavy operational interfaces.
 Built reusable UI architecture, complex tables/forms, API integrations, automated tests, and AI-assisted product workflows.
Technologies: TypeScript, React, Vite, TanStack Query, TanStack Table, TailwindCSS, React Hook Form, Zod, Storybook, React
Testing Library, Cypress, REST APIs
Full-Stack Developer Aug 2023 - Jan 2024
AI-Powered Document Management Platform
 Designed and implemented a full-stack application for creating, editing, versioning, and managing contracts and compliance
documents.
 Built rich frontend workflows and backend services for authentication, document operations, secure storage, external APIs, and
AI-assisted editing.
Technologies: TypeScript, React, Vite, Radix UI, TailwindCSS, React Hook Form, Node.js, NestJS, MongoDB, REST APIs,
OpenAI API
Frontend Developer Apr 2023 - Jul 2023
Instant Lending Platform
 Developed customer-facing acquisition and loan application experiences, CMS-driven pages, reusable responsive components,
and external API integrations.
Technologies: TypeScript, React, Next.js, TailwindCSS, Contentful, React Hook Form, Zod, REST APIs, CSS/SCSS
Frontend Developer Aug 2022 - Mar 2023
Digital Banking Platform
 Modernized online banking journeys by integrating new APIs and improving usability, responsiveness, security, and
maintainability.
 Built reusable application modules, forms, dashboards, state-management flows, and data-heavy UI components.
Technologies: TypeScript, React, Next.js, Material UI, Redux Toolkit, React Query, React Hook Form, Jest, REST APIs
Full-Stack Developer Nov 2021 - Jul 2022
Marketplace Platform
 Built product management, supplier dashboards, catalog search/filtering, order tracking, analytics, media upload, and
authentication flows.
 Designed PostgreSQL schemas and implemented backend endpoints, business logic, role-based access, and S3 media
workflows.
Technologies: TypeScript, React, React Query, Material UI, Node.js, NestJS, Prisma ORM, PostgreSQL, S3, JWT, Docker,
Docker Compose, GitHub Actions
Full-Stack Developer Jan 2021 - Oct 2021
UGC Management Platform
 Implemented frontend-backend product flows, authentication and authorization, responsive interfaces, reusable components, and
content-management REST APIs.
Technologies: JavaScript, TypeScript, React, Redux Toolkit, Chakra UI, Express.js, PostgreSQL, Sequelize ORM, REST APIs,
JWT
Part-Time IT Mentor Aug 2022 - Dec 2024
IT School / Software Development Mentoring
 Mentored students in frontend and full-stack web development alongside commercial engineering work.
 Conducted code reviews and taught JavaScript/TypeScript, React, application architecture, Git workflows, debugging, testing,
and clean-code practices.
 Supported practical projects, task decomposition, technical problem solving, interview preparation, and transition toward
commercial development.
Technologies: JavaScript, TypeScript, React, Next.js, HTML, CSS/SCSS, Git, REST APIs, Node.js fundamentals, Jest, debugging,
code review

EDUCATION
Bachelor of Computer Science Sep 2021 - Jun 2025
Lviv Polytechnic

LANGUAGES
Ukrainian - Native | English - Upper-Intermediate