Open to opportunities

Kirill Shevchenko

@kirillshevchenko1

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Senior backend engineer specializing in fintech payments, blockchain integrations, and high-load PHP systems.

Montenegro

Message

What I'm looking for

I’m looking for backend-focused fintech and payments work where I can build secure payment infrastructures, scale high-load systems, and improve reliability/performance with clean APIs, strong database engineering, and pragmatic automation for international teams.

I’m a Senior Backend Engineer with 11+ years of experience building backend systems for fintech platforms and high-load PHP applications. I focus on payment infrastructures, transaction processing, and API-driven architectures (REST/SOAP) that stay reliable under pressure.

I’ve delivered performance and scalability improvements across multiple systems, including optimizing MySQL/MariaDB up to 8x faster queries and supporting reliability for platforms with 1M+ users. I build with a strong emphasis on database scaling, caching, and operational visibility through logging and monitoring.

As a B2B contractor, I deliver full-cycle backend engineering for international teams—secure transaction workflows, Stripe integrations, payouts and refunds, and blockchain tooling (Bitcoin/UTXO, PSBT, Ethereum integrations). I also support product delivery by integrating legacy services, creating reusable layers, and streamlining CI/CD and automation to reduce operational workload.

Experience

Work history, roles, and key accomplishments

Current

Backend Engineer (Fintech)

Current

B2B Contractor

Jan 2023 - Present (3 years 6 months)

Designed fintech payment-processing backend with secure transaction workflows using Symfony and Stripe. Built Bitcoin/PSBT transaction tooling and scalable REST APIs with legacy SOAP integrations, plus a high-volume PHP streaming library and a WordPress platform serving 1,000+ users.

PHP Symfony Stripe Integration REST APIs SOA Integration Bitcoin UTXO & PSBT MySQL MariaDB Docker

Full-Stack Contractor

Independent Contractor

Jan 2014 - Jan 2019 (5 years)

Built web applications, dashboards, and CMS systems for SMB clients, developing REST APIs and admin panels. Performed SQL optimization and system refactoring to improve performance and maintainability.

Web Application Development Dashboard Development CMS Development REST APIs Admin Panel Development SQL Optimization Refactoring