Oleksandr Mazepa
Oleksandr Mazepa

Senior Software Engineer

Actively looking · Member since 25 Jul 2025
Message
Location
Ukraine
Desired salary
from 30 USD/hourly
Work preference
Full Time, Part Time
Experience level
Not set

About

Professional summary

I am a results-driven Senior Software Engineer with over 10 years of experience in designing and building high-performance, cloud-native, and microservices-based applications across various domains including healthcare, finance, and blockchain. My expertise lies in full-stack development using technologies such as React, Next.js, NestJS, Node.js, and Go. I have a deep understanding of deploying scalable systems on platforms like Azure and AWS. I have a proven ability to architect distributed applications, integrate third-party APIs, implement secure authentication layers, and optimize systems for performance and maintainability. I am also proficient in smart contract integration using Web3/Ethers.js and have experience with decentralized applications (DApps), on-chain data indexing, and blockchain automation. I am passionate about writing clean code, mentoring junior engineers, and adhering to DevOps best practices.

Skills

24 capabilities

Experience

Career history

Senior Software Engineer / Software Architect Quantum Finance

Spearheaded the migration of legacy JavaScript applications to a fully modular TypeScript codebase, enhancing type safety and reducing runtime errors by 35%. Designed and implemented scalable microservices using NestJS, Node.js, and Go, deployed across Azure Kubernetes Service (AKS) and AWS ECS. Integrated Ethereum and Binance Smart Chain smart contracts using Web3.js and Ethers.js, enabling decentralized wallet, staking, and DAO features. Developed and deployed TheGraph subgraphs for indexing on-chain events, enabling real-time data querying for analytics dashboards.

Fullstack Developer UnitedHealth Group

Developed and maintained full-stack applications using .NET on the backend and React with TypeScript on the frontend to support internal healthcare intelligence tools. Created and optimized RESTful APIs and microservices to enable seamless integration between clinical platforms, data analytics dashboards, and external provider systems.

Software Consultant Pariveda

Collaborated as part of a client delivery team to implement full-stack solutions using frontend frameworks (React, Angular, or similar) and backend technologies (Node.js, .NET, Java, or Python). Developed modular components and interfaces using HTML/CSS/JavaScript and assisted in building responsive, accessible user interfaces.

Education

Learning history

Lviv Polytechnic National University

Bachelor of Computer Science

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