Mykola Sagin
I’m Mykola Sagin, a senior full-stack software engineer with 10+ years of experience building and scaling production systems.
About
I’m Mykola Sagin, a senior full-stack software engineer with 10+ years of experience building and scaling production systems. I enjoy turning complex product and payment requirements into reliable architectures—especially micro-frontend setups, API-first designs, and deterministic workflows that improve performance, security, and user conversion.
In my recent work at Paymove, I architected a terminal-less QR payment platform, led React/TypeScript checkout flows, and designed payment primitives aligned with an agentic AI roadmap. Previously, as a founding engineer, I built a hybrid React/Next.js product from the ground up and scaled infrastructure on AWS, and earlier I contributed to microservices and frontend architecture at VeeZuu—always with a focus on measurable outcomes, collaboration, and high-quality delivery.
- 9 years' experience
- Joined October 2026
Industry experience
- Software & Internet
Work experience
Architected Paymove’s terminal-less QR payment platform, designing the transaction lifecycle, multi-tenant data model, backend API contracts, webhook-processing boundaries, and browser synchronization strategy. Implemented core Node.js services and React/TypeScript checkout flows for the payment-critical path, enabling transactions without dedicated hardware, installation, or customer registration. Built a shared styled-components component library used across checkout and merchant dashboard, eliminating duplicate UI work. Developed merchant dashboard/admin interfaces integrating multiple payment-provider flows into a single frontend experience for the merchant network. Established payment primitives aligned with an agentic AI roadmap via deterministic, machine-consumable APIs (initiation, verification, status, settlement) including signed sessions, idempotency, explicit state transitions, and auditable provider callbacks. Improved checkout completion from 78% to 94.6% in low-connect
Led a startup product from ground up to production deployment. Designed and deployed a hybrid frontend stack using React, Next.js, and Feature-Sliced Design (FSD), integrated with Firebase and core AWS services. Directed cloud and technical strategy aligned to business objectives, scaling infrastructure using AWS EC2, Kubernetes (EKS), S3, and CloudFront to optimize performance and reduce latency. Mentored junior and mid-level developers, facilitated knowledge sharing, and supported a continuous learning culture. Conducted code reviews and implemented best practices, reducing bugs and technical debt by ~70%.
Led product direction from concept to production deployment in a cross-functional team of 5. Designed and implemented a microservices backend using Go, Node.js, GraphQL, Python, MongoDB, and PostgreSQL. Defined and introduced a React + RxJS frontend architecture to standardize state management and application structure across the platform.
Education
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