Andrii Furmanets

Full-Stack Developer | React, TypeScript, Next.js | Ruby on Rails

A highly skilled Senior Full-Stack Developer with expertise in React, TypeScript, and Next.js for frontend and Ruby on Rails for backend solutions. Adept at crafting high-performance applications for fintech, Web3, and healthcare industries, delivering scalable and user-friendly solutions.

React
React
Next.js
Next.js
TypeScript
TypeScript
Tailwind CSS
Tailwind CSS
Node.js
Node.js
Ruby on Rails
Ruby on Rails
GraphQL
GraphQL
MongoDB
MongoDB
PostgreSQL
PostgreSQL
Redux
Redux
Docker
Docker
AWS
AWS

About Me

Senior Full-Stack Developer | Fintech & Web3 Specialist

I am a Senior Full-Stack Developer with expertise in React, TypeScript, and Next.js for frontend development and Ruby on Rails for backend solutions. Over the years, I have built scalable, high-performance applications across fintech, Web3, and healthcare industries, delivering user-centric frontend experiences alongside robust backend architectures.

I specialize in building, optimizing, and scaling applications that combine technical precision with business impact, ensuring seamless user experiences while maintaining high security and performance standards.

What I Bring to the Tech Industry

🚀 A Versatile and Well-Rounded Engineer

I thrive at the intersection of frontend and backend development, allowing me to architect complete solutions—from intuitive user interfaces to highly optimized backend APIs. My work spans multiple domains, including:

  • Fintech – Creating secure financial platforms that streamline transactions and data flow.
  • Web3 & Blockchain – Developing decentralized applications (dApps) that redefine digital ownership and governance.
  • Healthcare – Building data-driven applications that enhance medical workflows.

What sets me apart:

  • I understand how the entire software stack fits together.
  • I bridge the gap between scalability, security, and performance.
  • I can step into any stage of development, from prototyping to production optimization.

⚡ Problem-Solver, Not Just a Coder

I don't just write code—I solve complex technical and business challenges. Whether it's reducing friction in financial transactions, integrating decentralized systems, or scaling high-traffic platforms, I focus on delivering solutions that make a measurable impact.

  • Built and launched a career management advisory UI for a fintech startup, which helped executives proactively manage their careers—earning 90%+ positive user feedback.
  • Optimized fintech trading platforms, reducing latency and improving real-time transaction accuracy.
  • Led Web3 integration efforts on blockchain-based platforms, ensuring high security and seamless UX.

How I think:

  • "Does this solution scale?"
  • "How does it impact user experience?"
  • "Can it be optimized for better performance?"

👨‍💻 A Technical Leader with a Growth Mindset

As a senior developer, I don't just build—I help teams and projects move in the right direction. I've had the opportunity to guide frontend teams, shape technical roadmaps, and mentor junior engineers to ensure best practices and maintainable architectures.

  • I lead by example, making sure every technical decision adds long-term value.
  • I've mentored frontend engineers, helping them improve React, TypeScript, and system design skills.
  • I ensure codebases remain scalable, maintainable, and performant—even as applications grow in complexity.

My leadership philosophy:

  • Write clean, maintainable code that stands the test of time.
  • Guide teams toward efficient, scalable architectures.
  • Encourage continuous learning, staying ahead of industry trends.

🎯 A Developer Who Understands Business & Product Needs

I believe that great engineering goes beyond just code—it's about understanding the business context and user experience. I work closely with product managers, designers, and stakeholders to align technical decisions with business goals.

  • In fintech, I build platforms that prioritize security, compliance, and transaction efficiency.
  • In Web3, I balance decentralization with usability and performance.
  • In startups, I work directly with founders to turn ideas into scalable products.

I don't just ask "How do we build this?"—I ask "How do we build this the right way?"

📚 A Lifelong Learner and Innovator

Technology evolves fast, and I make it a priority to stay ahead of the curve. I am constantly exploring new technologies like Rust, AI-driven development, and advanced cloud infrastructures, ensuring that the solutions I build today are future-proof and scalable.

  • I actively follow emerging trends in Web3, AI, and cloud computing.
  • I contribute to open-source projects and technical discussions.
  • I continuously refine and optimize development processes to increase efficiency.

For me, software engineering is not just a job—it's a continuous pursuit of innovation and improvement.

Let's Connect!

I am always open to discussing exciting projects, technical challenges, and opportunities for collaboration. Whether it's a new fintech solution, a blockchain-based application, or an innovative startup idea, I bring a problem-solving mindset and deep technical expertise to the table.

Career Timeline

FolioFlux

Sep 2024 - Present

Founder

Designed and developed FolioFlux, an AI-powered crypto portfolio tracking platform. Built the entire application from concept to implementation as the sole developer. Created the UI/UX design, front-end and back-end architecture. Implemented AI-driven analytics features for portfolio optimization. Developed real-time data integration with cryptocurrency exchanges and market data providers.

Intellias: Cloud Data Warehouse Implementation

Aug 2024 - Present

Frontend Developer

Architecture & Setup: Established the project from scratch using an Nx monorepo, ensuring a modular and maintainable codebase. Technologies: Built with React and TypeScript for a robust, high-performance front end and leveraged GraphQL for efficient data querying. Key Contributions: Designed reusable components, optimized build processes, and integrated modern development practices to streamline collaboration and accelerate development.

Near Blockchain

Jan 2024 - Aug 2024

Frontend Developer

Built slick React components on NEAR's Blockchain OS, powering decentralized apps with top-tier security and UX. Led Grassroot DAO pages (near.org/ndcdev.near/widget/daos.App), delivering report/proposal features for real-time governance.

Intellias: Fintech Project

Nov 2021 - Dec 2023

Frontend Developer

Owned end-to-end development of a Next.js-powered fintech site, driving seamless equity and bond trading for users. Partnered with designers to craft intuitive UI, cutting user onboarding time by 25%. Managed production rollouts, ensuring zero-downtime updates under tight deadlines.

Intellias: Fintech Project (Banking Platform)

Mar 2021 - Nov 2021

Frontend Developer

Revamped trading views for an online banking giant, enhancing real-time financial tools with React and Redux.

CyberCraft: Career Management Startup

Aug 2020 - Mar 2021

Frontend Developer

Launched UI for a startup shaking up executive career paths, using React and Ant Design—solo Ukrainian on the team!

Became a Father

December 15, 2017

Life's Greatest Achievement

Welcomed my child into the world and began the most rewarding journey of my life.

CyberCraft: Continuous Integration Tool

Jan 2015 - Aug 2020

Full-Stack Developer

Transformed static pages into dynamic Backbone.js interfaces, slashing test wait times by 10-50x. Redesigned report views with Vue, adding lifecycle steps for real-time build insights. Integrated Okta for SAML auth and user provisioning, leveling up security. Upgraded Rails 3 to 4, keeping the engine humming.

SoftServe: Reports Render Engine

Dec 2012 - Jan 2015

Backend Developer

Crafted a Ruby DSL for healthcare report rendering, turning raw data into actionable charts and tables.

Skills & Expertise

A comprehensive overview of my technical skills and areas of expertise.

Frontend Technologies

ReactNext.jsTypeScriptJavaScriptHTML5CSS3Tailwind CSSMaterial UIReduxReact Query

Backend Technologies

Ruby on RailsNode.jsExpressGraphQLREST APIPostgreSQLMongoDBRedisSidekiq

Web3 & Blockchain

NEAR ProtocolSolidityWeb3.jsEthers.jsSmart ContractsDApps

DevOps & Deployment

DockerKubernetesAWSCI/CDGitHub ActionsVercelHeroku

Security & Authentication

OAuthJWTFirebase AuthRole-Based Access ControlData Encryption

Testing & Debugging

JestReact Testing LibraryCypressRSpecDebugging Tools

Additionally, I have expertise in performance optimization, scalability, and mentoring junior developers.

Education & Certifications

My academic background and professional certifications.

Education

Master's Degree in System Programming

Lviv Polytechnic National University

2008 - 2013

Specialized in software engineering and system programming, with a focus on algorithm design and optimization.

Certifications

MongoDB for Developers

MongoDB University

2018

EFSET Quick English Check (CEFR B1/B2)

EF Standard English Test

2019

Get In Touch

Have a project in mind or want to discuss potential opportunities? Feel free to reach out.

Contact Information

Feel free to reach out through any of these channels.

Location

Lviv, Ukraine