Oleksandr

Oleksandr Kushnir
Senior Frontend Engineer


email: [відкрити контакти](див. вище в блоці «контактна інформація»)
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PROFESSIONAL SUMMARY
Senior Frontend Engineer with 10+ years of experience designing and delivering large-scale
web applications across Web3, Blockchain, Cybersecurity, Logistics, SaaS, E-commerce,
B2B, and B2C domains. Proven expertise in frontend architecture, React ecosystems,
scalable enterprise systems, performance optimization, and cross-functional collaboration.
Experienced in leading engineering teams, driving technical decisions, and building secure,
high-performance applications serving millions of users globally. Strong background in
microservices architecture, CI/CD, modern frontend tooling, and AI-assisted software
development workflows.

CORE EXPERTISE
Frontend

● React
● TypeScript
● JavaScript (ES6+)
● Redux
● React Query
● React Router
● React Hooks
● Next.js
● HTML5
● CSS3
● Styled Components

Architecture

● Microservices
● System Design
● Scalability
● Performance Optimization
● Design Patterns

APIs & Data

● REST
● GraphQL
● RPC
● WebSockets
● Swagger

DevOps & Infrastructure

● CI/CD
● Git Actions
● Docker
● Git
● Elasticsearch
● Prometheus
● Grafana
● Argo

Blockchain & Web3

● Web3 & Web3Auth
● Wallet Integrations
● Blockchain APIs
● GameFi
● Transaction signing
● Blockchain Explorers
● Casper Ecosystem
● On-chain Data

Security

● Anti-Phishing Solutions
● Account Takeover Prevention (ATO)
● Business Email Compromise (BEC)
● Threat Intelligence
● Secure UX Design

PROFESSIONAL EXPERIENCE
MAKE
Senior Frontend Engineer
Mar 2023 – Present

Building Web3 and blockchain infrastructure products within the Casper ecosystem.
Developed user-facing applications interacting with smart contracts and blockchain
networks.

Key Achievements

● Built production-grade Web3 applications.
● Developed blockchain explorers, wallets, staking solutions and crypto services.
● Integrated blockchain APIs and on-chain data.
● Improved developer and user experience across blockchain products.
● Leveraged Cursor and Claude Code to accelerate development workflows.
● Delivered scalable frontend solutions supporting ecosystem growth.

Technologies: React, TypeScript, Web3, Blockchain APIs

CYREN
Senior Frontend Developer
Apr 2021 – Mar 2023

Worked on enterprise cybersecurity solutions protecting millions of users worldwide. Built
systems focused on phishing prevention, account takeover protection, ransomware defense,
and threat intelligence.

Key Achievements

● Designed and implemented enterprise security dashboards.
● Built scalable frontend architecture for cybersecurity products.
● Contributed to anti-phishing and ATO prevention platforms.
● Collaborated on cloud-native security solutions.
● Led frontend initiatives and mentored developers.
● Participated in microservices architecture design.

Technologies: React, TypeScript, Redux, GraphQL, Microservices

TRANSCENDA
Senior Frontend Developer
Mar 2020 – Jun 2021

Developed enterprise logistics solutions for BNSF Logistics, supporting one of North
America's largest freight railroad networks.

Key Achievements

● Built monitoring and analytics systems.
● Worked with large-scale operational datasets.
● Improved visibility and decision-making processes.
● Delivered solutions for mission-critical transportation infrastructure.

Technologies: React, TypeScript, Enterprise Dashboards

DENNIS PUBLISHING LTD
Frontend Developer
Aug 2018 – Apr 2020

Developed a large-scale automotive marketplace connecting buyers, dealers, and financial
institutions in the UK market.

Key Achievements

● Built customer-facing marketplace features.
● Integrated payment and subscription flows.
● Developed dealer and customer management tools.
● Contributed to the full purchasing journey.

THE APP SOLUTIONS
Frontend Developer
Feb 2017 – Aug 2018

Developed e-commerce and marketplace solutions from scratch. Worked directly with
stakeholders and customers to deliver business-critical features.

PROGFORCE

Full Stack Developer
Jul 2015 – Oct 2016

Worked across frontend and backend systems, delivering software solutions for international
clients.

EDUCATION
Master's Degree in Computer Science
National Technical University of Ukraine 'Kyiv Polytechnic Institute'
2010 – 2016

LANGUAGES
● Ukrainian — Native
● English — B2
● Spanish — B1 (Dele)

About me
I’m a fun guy