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Andrii Khmelovsky
Lead Engineer with over a decade of experience driving fintech, blockchain,
and SaaS innovation. Expert in architecting and leading end-to-end web and
cloud solutions.
Mukachevo, Ukraine, CET

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Expertise & Vision
Technical leader and full-stack engineer with over 10 years of experience architecting and delivering scalable solutions across
fintech, Blockchain, and SaaS domains. Proven track record in guiding products from concept to market success, managing cross-
functional teams of up to 20 professionals, and fostering high-performance engineering cultures. Adept at bridging technical and
business perspectives to drive innovation and alignment across stakeholders. Experienced in AI and ML systems, leveraging
modern JavaScript and TypeScript ecosystems (React, Next.js, Vue, Svelte, Angular) for CSR/SSR/SSG/PWA applications, and
backend development with Node.js, Nest.js, Go, and Rust. Skilled in designing and deploying monolithic, microservice, and
serverless architectures on AWS, Google Cloud, and Azure.

Work Experience
Payabl. Next.js TypeScript Python Postgres Antd Jan 2025 - Present
Senior Software Engineer
Developing web applications and microservices for business banking, focus on core functionality for payments, transaction validation, detailed financial
reporting and administration.

Implemented new features and improved existing codebase across multiple banking services.
Built and optimized transaction workflows, payment validations, and reconciliation processes.
Designed and maintained reporting modules for financial data analysis and audit tracking.
Performed code reviews, shared technical solutions, and aligned engineering approaches across teams.
Took full ownership of features from technical design to production deployment.
Ensured high code quality through test coverage and hands-on deployment validation.
Contributed to architecture decisions, scalability enhancements, and release stability.

Teaching Strategies JavaScript Node.js React MUI MariaDB Python Oct 2023 - Oct 2024
Staff Software Engineer
Developing intuitive and impactful educational software for teachers.

Owned full feature lifecycle, from refinement and design to final delivery and deployment.
Implemented complex data-driven interfaces with filtering, reporting, and visualization logic.
Maintained high UI precision, often building from conceptual designs using MUI and custom components.
Ensured code reliability through solid test coverage and active involvement in deployment validation.
Conducted code reviews, improved architecture, and contributed to better performance and maintainability.
Collaborated with cross-functional teams to deliver scalable and maintainable solutions.

Thirty Capital Next.js TypeScript Module Federation MUI Python Postgres Feb 2021 - Oct 2023
Frontend Tech Lead
Built a CRE asset management system for real estate portfolio managers to analyze and manage investments.

Led the frontend stream of 10 engineers, overseeing feature development and delivery.
Took full feature ownership, from technical design to production deployment.
Conducted code reviews, mentored team members, and participated in hiring interviews.
Designed application architecture and optimized system performance.
Implemented new features, filters, charts, and detailed reporting modules.
Managed releases, ensured test coverage, and maintained alignment with stakeholder requirements.
Lucky Voice JavaScript React.js Electron React Native Python MySQL Jul 2019 - Feb 2021
Frontend Engineer Frontend Team Lead
Led frontend development for a karaoke bar network, building mobile apps, terminal applications, and web platforms to enhance customer experience and
operational efficiency.

Led feature development and bug fixing across multiple platforms, ensuring seamless user experience
Planned product roadmaps, wrote technical specifications, and managed sprint task distribution
Conducted technical interviews and participated in hiring processes to build high-performing team
Mentored frontend developers and conducted code reviews to maintain high code quality standards
Implemented comprehensive test coverage and established quality assurance processes
Investigated and adopted new technologies to enhance cross-platform development workflows

Nurburgring GmbH & Co. KG JavaScript Preact JQuery Ruby on Rails Postgres Oct 2017 - Jul 2019
Frontend Engineer
Developed comprehensive news and booking platform for motorsport track services including concerts, races, and test drives, with integrated e-commerce
for merchandise sales.

Developed features and resolved performance bottlenecks to optimize application speed
Implemented headless Magento integration for merchandise sales and payment processing
Managed comprehensive test coverage and maintained code quality standards
Developed smart TV applications for advertising campaigns and live race streaming experiences
Deployed separate microfrontends on AWS infrastructure

Independent Engineer Full-Stack Consulting Architecture Multiple Clients Enterprise 2016 - 2025
Fractional CTO · Tech Lead · Developer · Consultant
Work independently on projects addressing diverse business needs from concept to launch, providing consulting, development, and technical support with
focus on user experience, performance optimization, and application speed.

Deliver end-to-end solutions from concept to launch for diverse business requirements
Provide consulting, development, and technical support throughout project lifecycle
Optimize user experience and application performance to enhance speed and responsiveness
Design and implement full-stack solutions with focus on scalability and efficiency

Education
Kyiv College of Information Systems and Technologies, KNEU 2013 - 2017

Junior speccialist in Software Engineering

Institute of Information Technologies in Economics, KNEU 2017 - 2020

Master's Degree in Computer Science

Skills
JavaScript TypeScript Node.js React Next.js Vue.js Angular Python Go Rust Express.js Nest.js

GraphQL REST APIs PostgreSQL MongoDB Redis AWS Docker Kubernetes Tailwind CSS SASS Webpack

Vite Jest Storybook Git GitHub GitLab Vite Jest Three.js React Native

Side projects

ISSF Ello Brawl3rs
End-to-end web platform for the AI-powered reading coach app with speech Experimental Web3 + AI project combining
International Shooting Sports Federation, recognition technology for children K-3, meme culture, prediction markets,
integrating live broadcasts, performance featuring adaptive learning and interactive and interactive battles between user-
analytics, and online store e-books generated agents

TypeScript Three.js

TypeScript Next.js AWS Adaptive Learn React TypeScript Next.js Radix UI

PostgreSQL Tailwind CSS React Native MUI Firebase Ethers.js Blockchain