Ivan

Ivan Koltsov
Senior AI & Full-Stack Engineer (10+ years)
Kyiv, Ukraine • [відкрити контакти](див. вище в блоці «контактна інформація») • [відкрити контакти](див. вище в блоці «контактна інформація») • LinkedIn • Telegram (@commondeveloper)

PROFESSIONAL SUMMARY
Senior Backend & AI Engineer with 10+ years of enterprise experience specializing in high-load, latency-sensitive
applications across FinTech, MedTech/HIPAA, and Media/Streaming. Proven track record in modernizing legacy
architectures, scaling systems to millions of active users, and integrating LLM agents & RAG pipelines (Bedrock,
LangChain, LangGraph). Dedicated to clean architecture, TDD/SDD, and token/cost optimization. Looking for structured
teams valuing technical clarity and predictable delivery.
CORE EXPERTISE
Back-End: Node.js (NestJS, Express, Fastify, Hono), Python (FastAPI, Airflow, PyTorch/TensorFlow, DSPy), Java
(Spring Boot, Quarkus)
AI & LLM: Amazon Bedrock, Pinecone, PGVector, LangChain, LangGraph, OpenAI / Claude API, RAG, Agentic
Workflows
Front-End: React, Next.js, Angular, TypeScript, Tailwind, Recharts.js, Three.js, Expo / React Native
Cloud & DevOps: AWS (Lambda, SQS, SNS, Bedrock, S3), Azure, GCP, Docker, Kubernetes, Terraform, PostgreSQL,
MongoDB, Redis, Supabase
PROFESSIONAL EXPERIENCE
Senior AI & Full-Stack Engineer | NDA (MedTech & AI / Streaming) Feb 2023 – Present
Developed MedTech analytics backends using Python (FastAPI) with interactive React, Recharts.js, and Three.js
frontend visualizations.
Implemented enterprise AI chatbots and multi-agent workflows utilizing OpenAI, Gemini, LangChain, LangGraph, and
LangFuse.
Built automated video ad generation pipelines leveraging Python, Airflow, DSPy, and Pinecone.
Senior Full-Stack Engineer | Pluto TV Mar 2021 – Feb 2023
Scaled media streaming platform serving millions of active users using Next.js, React, and React Native.
Developed resilient backend microservices and APIs using Node.js, NestJS, and Python (FastAPI).

Ivan Koltsov — Resume Page 1 of 2

PROFESSIONAL EXPERIENCE (CONTINUED)
Senior Full-Stack Developer | HRS Group Apr 2019 – Mar 2021
Spearheaded modernization of legacy business travel CRM monolith (Java, JSP, SAP, Vaadin) to Spring Boot,
NestJS, and React/Next.js.
Integrated advanced data analytics dashboards using Recharts.js and Three.js, increasing active user traffic by 25%.
Senior Lead Full-Stack Developer | Companybook May 2018 – Apr 2019
Refactored and migrated hybrid AngularJS applications to Angular 7 with modular Web Components; managed cloud
migration to AWS.
Integrated Microsoft D365 for mobile financial reporting tools.
Senior Lead Full-Stack & Integration Developer | Qvantel (KyivStar/VEON) Jun 2017 – May 2018
Built micro-frontend architectures and user interfaces using Angular (1.5-5), NgRx, and React/Redux for telecom
solutions.
Senior Full-Stack Developer | Trinetix Jul 2016 – Jun 2017
Delivered financial information management and trading audit platforms using Angular, .NET/C#, and Node.js.
Senior Software Engineer | IntroPro (AT&T / DirecTV) Aug 2013 – Jul 2016
Designed streaming media interfaces and backend services for broadcasting platforms using React, Angular, Node.js,
and Java/Scala.
Software Engineer | Ciklum & GlobalLogic Oct 2010 – Aug 2013
Developed enterprise document management systems, cross-platform desktop tools (C++, C#, Mono), and Ext.JS
web solutions.
EDUCATION
National University — Bachelor’s degree in Software Engineering / Computer Programming
CERTIFICATIONS
Claude Code 101 | Real Time Web with Node.js | Building Blocks of Express.js | Build reactive applications with signals
in Angular | Powering Up With React

Ivan Koltsov — Resume Page 2 of 2