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Aleksandr Koloshtivin

@aleksandrkoloshtivin

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Frontend Engineer building B2B products with React, Angular, and AI-powered features.

Georgia

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What I'm looking for

I’m looking to build B2B products where I can own frontend architecture, ship offline-first and AI-enabled features, and enforce TDD/CI with measurable quality. I want a team that values maintainability, fast iteration, and strong engineering craft.

I’m a Frontend/Fullstack engineer with 5+ years of experience in B2B SaaS and tech consulting, focused on shipping reliable products end-to-end. I build modern web experiences with strong testing discipline, and I love turning complex requirements into clean, maintainable UI architecture. A consistent theme in my work is balancing speed of delivery with long-term scalability.

Most recently, I’ve been creating offline-first and AI-powered applications—an offline-first PWA workout generator using multi-model OpenRouter, plus tools like a personal finance tracker with CSV import and a Telegram bot workflow. I also architected and deployed a CV optimization bot, built an EPUB/PDF reader that works offline, and delivered a monitoring bot that hot-reloads configuration to refine search criteria across Telegram channels.

Earlier, at MIGx, I architected and shipped an Angular B2B marketing platform as the sole frontend engineer, enabling an MVP launch three months ahead of schedule. I introduced TDD with Jasmine/Karma and achieved 95% unit test coverage while reducing regression testing time by 50%, and I built a reusable component library that accelerated new feature development by ~30%. In previous consulting work, I migrated a legacy AngularJS app to Angular 13, introduced Nx to reduce CI time, and mentored a team of 5 engineers on frontend architecture and best practices.

Experience

Work history, roles, and key accomplishments

Current

Fullstack Developer

Current

Self Employed

Nov 2025 - Present (8 months)

Developed multiple offline-first and AI-powered applications, including a workout generator that uses the OpenRouter multi-model API and persists data in IndexedDB. Also built and deployed several Telegram bots and client-side apps such as an EPUB/PDF reader and a monitoring bot for tracking job postings.

Offline First PWA OpenRouter API IndexedDB Telegram Bot Development React Native Angular Capacitor Telethon Hot Reloaded Configuration

Frontend Developer

MIGx

Jun 2023 - Nov 2025 (2 years 5 months)

Architected, built, and deployed an Angular B2B marketing platform from scratch as the sole frontend engineer. Implemented TDD with Jasmine/Karma, built a reusable Angular component library, and improved delivery speed for new features.

Angular B2B Marketing TDD Jasmine Unit Testing Component Libraries

Frontend Developer

EPAM Systems

May 2022 - Apr 2023 (11 months)

Led migration of a legacy enterprise app from AngularJS to Angular 13 and introduced an Nx-based monorepo setup to reduce CI time. Increased unit test coverage from under 20% to over 90% and mentored a team of 5 engineers in frontend architecture and best practices.

AngularJS Migration CI Optimization Unit Testing Frontend Architecture Design Patterns Mentoring

Flat Rental App for Relocated Developers

EPAM Community

Jan 2022 - Jan 2023 (1 year)

Voluntarily developed a flat rental app for relocated developers, contributing to UI/UX and frontend development. Supported the housing search experience for 100+ users across Montenegro and Serbia.

UI UX Design Frontend Development

Frontend Developer

WaveAccess

Mar 2020 - Apr 2022 (2 years 1 month)

Built real-time IoT dashboards and document editing experiences using Angular and RxJS, including linked-entity synchronization. Also created a Vue.js/Leaflet interactive map, optimized CMS rendering with code splitting and lazy loading, and resolved memory leaks via Chrome DevTools heap profiling.