Senior AI/Full-Stack (Java/NodeJs/Python +/- React) Developer

Feb **** – Present

Mar **** – Feb ****

Apr **** – Mar 2021

May 2018 – Apr 2019

Jun 2017 – May 2018

Summary

AI/LangChain/LangGraph & Full-Stack Engineer with 10+ years of experience building and maintaining reliable, scalable systems in FinTech, MedTech, Media/Video, and Enterprise environments. Focused on clean architecture, sustainable development

(BDD/TDD, IaC), and system stabilization. Proven track record of full lifecycle ownership from cloud-native development (AWS/K8s) to high-performance front-ends. Professional Experience

MedTech & Nova App AI & TeeVee

Senior Full-Stack AI Engineer

Developed Medtech analytics & visualization dashboards using Recharts.js, Three.js, React-three-fiber, and Server Components. Implemented Enterprise & Medtech ChatBots leveraging ChatGPT/Gemini. Created AI-generated video ads using Python, Airflow, DSPy, FastAPI, Pinecone, TensorFlow, and Java/Spring AI.

Pluto

Senior Full-Stack Engineer

Engineered solutions for top Media/Video Entertainment and TV providers. Developed scalable platforms using Next.js/React, Node.js/Nest.js, Java/Spring Boot, and Go/Gin.

HRS

Senior Lead Developer

Led the upgrade and transformation of a legacy Monolith Business travel CRM/ Platform (HRS Group) to a modern API-first architecture. Migrated Java/JSP/JSF/SAP/Vaadin stack to Java/SpringBoot & Node.js/Nest APIs with React/Next UI.

Integrated deep analytics data using Recharts.js and Three.js. Senior Lead AWS/Angular/Node/Java Developer

ScaleUp Environment

Refactored and migrated hybrid Angular.js 1.6 to Angular 7 and Ionic web components.

Built BackEnd-For-FrontEnd GraphQL and REST API services; Integrated MS Dynamics 365.

Senior Lead AWS & Full-Stack Developer

Qvantel / Inscale

Developed Web UI components (Angular/React) for a MicroFrontend architecture in the Telecom sector (KyivStar/VEON).

Integrated GraphQL with Java/Scala backend via Node.js/Express proxy. Early Career (2010 – 2017)

Trinetix (2016-2017): Senior Azure/Angular/Node/.NET Dev for Big Four Financial tools. IntroPro (2013-2016): Senior AWS/Angular/React/Java Dev for AT&T/DirecTv Media Streaming.

Ciklum (2012-2013): C#/JavaScript Dev for financial document management platforms. GlobalLogic (2010-2012): C++/C#/JavaScript Dev for media/video editing enterprise tools. Core Competencies

Back-End

Java (Spring AI, Spring Boot, Quarkus),

Node.js (Express, Fastify, NestJS), Python

(Airflow, DSPy, FastAPI, TensorFlow), PHP

(Symfony), Go/Gin

Front-End

React, Next.js, Angular, SvelteKit,

TypeScript, Recharts.js, Three.js, Redux/

NgRx

Cloud & Data

AWS (Lambda, S3, ECS, Cognito, Bedrock),

Azure, GCP, PostgreSQL, MongoDB, Redis,

GraphQL, REST, Vercel

AI & Automation

LangChain, LangGraph, Agentic Loops,

OpenAI/Gemini APIs, Pinecone, DSPy,

Claude Code/Codex

Methodologies

BDD/TDD, Infrastructure as Code

(Terraform), CI/CD, Microservices, Async-

First Engineering

Education

National University

"Kyiv Aviation Institute"

Bachelor's Degree

Computer Science

Languages

Ukrainian: Native/Bilingual

English: Full Professional

Certifications

Real Time Web with Node.js

Building Blocks of Express.js

Staying Sharp With AngularJS

IVAN KOLTSOV

Senior/Tech Lead Engineer • AI Enterprise Systems • Full-Stack Location: Kyiv, Ukraine / Poland Phone: +380********* Email: *******@*****.*** LinkedIn: linkedin.com/in/ivan-koltsov-3016763a Telegram: t.me/commondeveloper

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