Yaroslav Protsenko

About

Experience

1. .NET Developer · GenieSolutions

   Dec 2021 — Mar 2026

   Ukraine4 yrs 4 mos

   Grew from supporting the company's websites to development work and payment integrations.

   • Paytiko — payment provider integration platform

     Sep 2022 — Mar 2026

     3 yrs 7 mos

     A service that lets businesses connect to multiple payment providers. I was responsible for payment provider integrations and keeping them running.

     • Built 50+ payment provider integrations from scratch, including Stripe, Adyen, Checkout.com, Braintree (PayPal), Worldpay (Google Pay), Amazon Pay, Ebanx, AstroPay, Flutterwave and Zen.
     • A wide range of payment methods: cards, wallets, crypto, buy now, pay later and local methods such as M-Pesa and Przelewy24.
     • The full payment lifecycle: hosted payment pages and direct server-to-server calls, status webhooks, request signing and verification, 3-D Secure, refunds and payouts.
     • Kept teammates' integrations working when providers changed their APIs, including PayPal and Binance Pay.
     • Covered integrations with unit tests.
     • C#
     • .NET
     • ASP.NET Core
     • REST API
     • Webhooks
     • MSTest
     • Moq
     • FluentAssertions

   • Company web projects: support and development

     Dec 2021 — Aug 2022

     9 mos

     Started out supporting the company's websites, then joined development on its other projects before moving to Paytiko.

     • C#
     • .NET

2. PHP/Laravel Developer · Freelance

   Feb 2021 — Dec 2021

   Kharkiv Oblast, Ukraine11 mos

   Contract backend work: helped build the two systems below and supported the client's other projects, investigating and fixing bugs.

   • Paid parking platform

     A paid parking platform made of three apps: a web panel for administrators, a mobile app for drivers and a tablet app for parking attendants. I worked on the backend shared by all three.

     • Admin panel: parking zones drawn on a map point by point, pricing, assigning attendants to zones.
     • Driver app: registered vehicles, parking payments and a subscription that lets the car stay without paying per visit.
     • Attendant app: patrolling and checking parked cars for a paid session or an active subscription.
     • Role-based access for three roles: drivers, attendants and administrators.
     • PHP
     • Laravel
     • MySQL
     • REST API

   • Access control with temperature screening

     An employee access system for any kind of workplace, built during the COVID-19 pandemic: at the entrance a person scans their pass, then steps up to a stand that takes their temperature. I worked on the backend.

     • Every entry is tied to the employee's pass, recording the time and their temperature.
     • Ingesting readings from an STM32-based stand and keeping the full history.
     • Mobile app for employees to see their own entry and temperature history.
     • Admin dashboard with the complete record for every employee: when they came in and at what temperature.
     • PHP
     • Laravel
     • MySQL
     • STM32
     • REST API

Skills

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