Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I’m Serhii Poraiko, a frontend engineer with around 9 years of experience delivering web and SPA applications. I enjoy building robust, scalable front-end architectures and creating polished user interfaces that delight users. My expertise spans SPA-focused stacks, with a strong emphasis on Angular, TypeScript, RxJS, and component-based design. I also work with React, NestJS, and hybrid mobile development using Cordova/Ionic to deliver cross‑platform apps.…Hi, I’m Serhii Poraiko, a frontend engineer with around 9 years of experience delivering web and SPA applications. I enjoy building robust, scalable front-end architectures and creating polished user interfaces that delight users. My expertise spans SPA-focused stacks, with a strong emphasis on Angular, TypeScript, RxJS, and component-based design. I also work with React, NestJS, and hybrid mobile development using Cordova/Ionic to deliver cross‑platform apps.

Serhii Poraiko

Front-End Developer, Web Developer, App Developer, +2





Hi, I’m Serhii Poraiko, a frontend engineer with around 9 years of experience delivering web and SPA applications. I enjoy building robust, scalable front-end architectures and creating polished user interfaces that delight users. My expertise spans SPA-focused stacks, with a strong emphasis on Angular, TypeScript, RxJS, and component-based design. I also work with React, NestJS, and hybrid mobile development using Cordova/Ionic to deliver cross‑platform apps.…Hi, I’m Serhii Poraiko, a frontend engineer with around 9 years of experience delivering web and SPA applications. I enjoy building robust, scalable front-end architectures and creating polished user interfaces that delight users. My expertise spans SPA-focused stacks, with a strong emphasis on Angular, TypeScript, RxJS, and component-based design. I also work with React, NestJS, and hybrid mobile development using Cordova/Ionic to deliver cross‑platform apps.

Available to hire

Hi, I’m Serhii Poraiko, a frontend engineer with around 9 years of experience delivering web and SPA applications. I enjoy building robust, scalable front-end architectures and creating polished user interfaces that delight users.

My expertise spans SPA-focused stacks, with a strong emphasis on Angular, TypeScript, RxJS, and component-based design. I also work with React, NestJS, and hybrid mobile development using Cordova/Ionic to deliver cross‑platform apps.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

Ukrainian

Fluent

Slovak

Advanced

English

Advanced

Work Experience

Frontend Engineer (Contractor)

September 1, 2025 - Present

Developed SPA applications using Angular 2+, React and NestJS; built hybrid mobile experiences with Cordova, Capacitor and Ionic; contributed to cross‑platform mobile apps for iOS and Android; focused on modern frontend tooling and architecture.

Frontend Engineer at HotelFriend AG

August 1, 2018 - August 1, 2025

Development of SPA applications using Angular 2+ and mobile apps using Angular 4+/Ionic; implementing CSS preprocessing, native mobile API integration via Cordova plugins, Google API integration, Leaflet maps, Facebook/Adyen/Stripe SDKs, Apple/Google Pay, PayPal SDK, WebSockets, deep links, and push notifications via OneSignal. Built cross‑platform mobile experiences and optimized frontend delivery.

Frontend Engineer at HotelFriend

August 1, 2018 - Present

Frontend development focusing on SPA using Angular 2+/4+ with Ionic, Cordova plugins, and native mobile integration; implemented deep linking, payments (Apple Pay/Google Pay), SDK integrations, and push notifications; contributed to cross‑platform mobile experiences and hotel concierge features.

Frontend Engineer at Omnisynapse

August 1, 2017 - September 1, 2018

Developed mobile SPA using Angular 2+/Ionic Framework and Cordova plugins; implemented Leaflet JS/Open Street Map mapping, REST API integrations, and SDK integrations (Facebook, Adyen, Stripe, Apple Pay/Google Pay, PayPal); built cross‑platform mobile apps.

Frontend Engineer at Omnisynapse

March 1, 2016 - June 1, 2017

Early SPA work with Angular 2+ / Ionic; CSS preprocessors; map integration with Leaflet; Socket.IO; socialSDK integrations; deep linking; push notifications; JavaScript/TypeScript development.

Frontend Developer

March 1, 2016 - June 1, 2017

Development of custom components for mobile SPA using AngularJS/Ionic framework; MVC patterns; native mobile API integration via Cordova plugins; team leadership and mentoring; implemented RESTful API integration, Socket.IO, RxJS, and NgRx; migrated to modern Angular/TypeScript; led frontend/mobile teams in Agile environments; code reviews and performance improvements.

Frontend Engineer (Contractor)

September 1, 2015 - Present

Developed SPA applications using Angular 1–8, React, NestJS; built hybrid mobile apps with Ionic, Cordova, and Capacitor; created cross‑platform mobile experiences for iOS and Android. Implemented push notifications via OneSignal and integrated Apple Pay, Google Pay, PayPal, Facebook and Adyen SDKs; designed and shipped a hotel concierge flow; implemented deep links via Branch.io. Led frontend/mobile teams in Agile environments, mentored developers, and conducted code reviews to improve quality and performance.