Hello, I'm

Oleksii Haidai

— Software Engineer

Using my experience and development skills, I make amazing complex systems that solve business problems and help it grow, as well as easy to use.

Download resume GitHub

About Me

I'm a Full-Stack Developer with 11+ years of experience building scalable products, complex backend systems, and modern web applications.

I specialize in Node.js and system architecture, with strong expertise in databases, APIs, high-load systems, and full product development lifecycle — from idea to production.

Throughout my career, I've worked on renewable energy platforms, IoT ecosystems, CRM/ERP systems, mobile applications, and Web3 products. I enjoy solving complex engineering problems and creating software that is reliable, efficient, and built to scale.

I'm deeply involved in every project I work on and naturally immerse myself into the development process, often reaching a strong state of focus and flow. I value clean architecture, responsibility, maintainability, and thoughtful engineering decisions.

50+ Projects

11 Years

Full-Stack

Backend

Frontend

Mobile

Architecture

Skills & Tools

Frontend

HTMLCSSJavaScriptTypeScriptReact & ReduxNext.jsTailwind CSS

Backend

Node.jsNest.jsPHPYii frameworkREST APIsMySQLPostgreSQL

Tools & DevOps

GitGitHubGitLabBitbucketDockerAWSFigmaCI/CDVSCodium

Featured Projects

Dok.ua

Leading Ukrainian e-commerce platform specializing in automotive parts, fluids, and accessories

Solar Service Group

Trusted Australian company that specialise in solar battery storage solutions, service, maintenance and repairs of PV solar systems nationally.

Rush HQ

Melbourne’s premier, large-scale indoor adventure park in Rowville, Melbourne, offering over 100+ interconnected trampolines, a high-ropes course, climbing walls, and a ninja warrior course.

Enertek

Software allowed you to control energy usage and solar production from anywhere around the world. Become more energy independent and make important lifestyle or financial decisions in real-time, anytime.

Warrp.it

iOS marketplace app based on an end-to-end design to make it S.A.F.E. for everyone. Buyers and sellers can Securely transact while the rest of the community plays an Active role in ensuring prices are Fair...

Racer Club

Ethereum based GameFi platform leading the Web3 movement to Esports.

Hyperian

Secure and powerful cloud-based operational software suite, enabling partners to monitor, control and manage the overall fleet, effectively onboard installers, and support the end-users providing a seamless experience across the Hyperian product range.

German B2B client

Intelligent B2B platform that connects Europe’s leading renewable power producers with enterprises committed to reducing their carbon footprint.