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Kostiantyn Z. React, Node and Modern Frameworks

My name is Kostiantyn Z. and I have over 4 years of experience in the tech industry. I specialize in the following technologies: React, Redux, Redux Saga, Mobx, styled-components, etc.. I hold a degree in Master's degree, Bachelor of Science (BS). Some of the notable projects I’ve worked on include: CarGoo — Uber-like Cargo Taxi Platform, Instant Video SDK — WebRTC Calling Engine, EduCalendar — Scheduler for Teachers & Students, CityMarket — Marketplace for 300+ London Retailers, CarGoo CRM — SaaS Platform for Fleet & Logistics Management. I am based in Kyiv, Ukraine. I've successfully completed 5 projects while developing at Softaims.

I thrive on project diversity, possessing the adaptability to seamlessly transition between different technical stacks, industries, and team structures. This wide-ranging experience allows me to bring unique perspectives and proven solutions from one domain to another, significantly enhancing the problem-solving process.

I quickly become proficient in new technologies as required, focusing on delivering immediate, high-quality value. At Softaims, I leverage this adaptability to ensure project continuity and success, regardless of the evolving technical landscape.

My work philosophy centers on being a resilient and resourceful team member. I prioritize finding pragmatic, scalable solutions that not only meet the current needs but also provide a flexible foundation for future development and changes.

Main technologies

  • React, Node and Modern Frameworks

    4 years

  • React

    3 Years

  • Redux

    3 Years

  • Redux Saga

    2 Years

Additional skills

Direct hire

Potentially possible

Previous Company

Intellias

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Experience Highlights

CarGoo — Uber-like Cargo Taxi Platform

Built an on-demand cargo taxi platform for real-time order management and driver dispatching. ✅ Real-time GPS tracking and dynamic order lifecycle ✅ Instant driver assignment based on vehicle type and location ✅ White-label mobile apps for drivers and clients ✅ Web Telephony integration for direct in-app calls ✅ Scalable infrastructure for multi-city deployment

Instant Video SDK — WebRTC Calling Engine

Designed a reusable WebRTC SDK: mute/cam toggle, busy-state, Safari fixes, reconnects. ✅ Trickle ICE, mediaTrack recovery, real-time events ✅ Built-in fallback UI, mobile-ready ✅ Pluggable into any SaaS product in under 30 minutes

EduCalendar — Scheduler for Teachers & Students

Built scheduling app for U.S. schools with timezone support and recurring events. ✅ Role-based access for admins/teachers/students ✅ Google Calendar sync, email reminders ✅ Mobile-first, designed for non-technical users

CityMarket — Marketplace for 300+ London Retailers

Built e-commerce & logistics backend to sync inventory and delivery slots. ✅ 300+ stores onboarded, 1000+ orders/min ✅ Pickup or scheduled delivery with slot optimizer ✅ Plug-and-play ERP layer

CarGoo CRM — SaaS Platform for Fleet & Logistics Management

Developed a modular SaaS platform to manage fleets, trips, analytics, and delivery workflows. ✅ Route optimization and advanced route planning ✅ Financial analytics (PnL, fleet costs, driver payouts) ✅ Proof of Delivery module with document workflow ✅ Admin panel with vehicle/driver management and real-time dashboards ✅ Supports 10,000+ units with multi-region, multi-currency support

Education

  • National Technical University of Ukraine 'Kyiv Polytechnic Institute'​

    Master's degree in Engineer researcher

    2013-01-01-2015-01-01

  • National Technical University of Ukraine "Kyiv Polytechnic Institute"

    Bachelor of Science (BS) in Design of laser and optical equipment

    2009-01-01-2013-01-01

Languages

  • English
  • Spanish
  • Russian
  • Ukrainian

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