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Hello! I'm Alex Astapenko, a senior software engineer with 8 years of hands-on experience building high-load SaaS, FinTech, and AI platforms. I specialize in end-to-end systems, real-time analytics, and AI/LLM integration, with a focus on reliable, scalable cloud-native architectures. I enjoy delivering polished front-end experiences and robust back-end services. My toolkit includes TypeScript, Node.js, Next.js, React, and a wide stack from AWS to Kubernetes, Docker, Postgres, Redis, and GraphQL. I thrive on collaboration and turning complex problems into clear, measurable outcomes.…Hello! I'm Alex Astapenko, a senior software engineer with 8 years of hands-on experience building high-load SaaS, FinTech, and AI platforms. I specialize in end-to-end systems, real-time analytics, and AI/LLM integration, with a focus on reliable, scalable cloud-native architectures. I enjoy delivering polished front-end experiences and robust back-end services. My toolkit includes TypeScript, Node.js, Next.js, React, and a wide stack from AWS to Kubernetes, Docker, Postgres, Redis, and GraphQL. I thrive on collaboration and turning complex problems into clear, measurable outcomes.

Alex Astapenko

Full Stack Developer, Back-End Developer, AI Engineer, +2

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Hello! I'm Alex Astapenko, a senior software engineer with 8 years of hands-on experience building high-load SaaS, FinTech, and AI platforms. I specialize in end-to-end systems, real-time analytics, and AI/LLM integration, with a focus on reliable, scalable cloud-native architectures. I enjoy delivering polished front-end experiences and robust back-end services. My toolkit includes TypeScript, Node.js, Next.js, React, and a wide stack from AWS to Kubernetes, Docker, Postgres, Redis, and GraphQL. I thrive on collaboration and turning complex problems into clear, measurable outcomes.…Hello! I'm Alex Astapenko, a senior software engineer with 8 years of hands-on experience building high-load SaaS, FinTech, and AI platforms. I specialize in end-to-end systems, real-time analytics, and AI/LLM integration, with a focus on reliable, scalable cloud-native architectures. I enjoy delivering polished front-end experiences and robust back-end services. My toolkit includes TypeScript, Node.js, Next.js, React, and a wide stack from AWS to Kubernetes, Docker, Postgres, Redis, and GraphQL. I thrive on collaboration and turning complex problems into clear, measurable outcomes.

Available to hire

Hello! I’m Alex Astapenko, a senior software engineer with 8 years of hands-on experience building high-load SaaS, FinTech, and AI platforms. I specialize in end-to-end systems, real-time analytics, and AI/LLM integration, with a focus on reliable, scalable cloud-native architectures.

I enjoy delivering polished front-end experiences and robust back-end services. My toolkit includes TypeScript, Node.js, Next.js, React, and a wide stack from AWS to Kubernetes, Docker, Postgres, Redis, and GraphQL. I thrive on collaboration and turning complex problems into clear, measurable outcomes.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Advanced

Polish

Beginner

Russian

Fluent

Work Experience

Senior Software Engineer at YouGov

March 1, 2023 - April 20, 2026

Led end-to-end RAG system for social data insights. Built streaming backend logic using Node.js and SSE, reducing perceived latency for real-time AI reports by ~65%. Delivered high-availability microservices with cloud infrastructure (AWS), and collaborated with data science for AI/LLM integration to improve insight delivery and platform reliability.

Senior Full Stack Engineer at ZebRunner

December 1, 2020 - January 20, 2022

Led migration from Angular monolith to React/Node.js micro-architecture; implemented CI/CD pipelines and automated deployment processes; built scalable frontend and backend components for marketing and analytics workloads, improving deployment frequency and maintainability.

Middle Front-end Developer at SportData

September 1, 2019 - November 20, 2020

Developed real-time trading dashboards and data visualizations; implemented high-frequency UI components and optimized front-end performance and accessibility for large data sets.

Front-end Developer at Click Media

January 1, 2017 - August 31, 2019

UI/UX-focused development for 50+ outsourced projects; performance optimization and cross-browser compatibility; delivered responsive B2B applications with strong UI polish.

Web Developer & UI/UX Designer at Upwork

November 1, 2016 - December 31, 2017

Freelance projects focusing on front-end development and UI/UX across various clients; delivered polished interfaces using HTML/CSS/JS and React.