Open to opportunities

Kostiantyn Ivannikov

@kostiantynivannikov

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I build and modernize scalable Angular, Node.js, and AWS SaaS products.

Ukraine

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What I'm looking for

I'm looking to build and modernize scalable SaaS and web products with Angular, Node.js, and AWS, taking high ownership across delivery. I value remote-first collaboration, maintainable architecture, async teamwork, and opportunities to mentor engineers.

I've built and modernized SaaS products, web applications, and scalable systems for distributed international teams over 15+ years. Most recently, I designed and delivered Agendacita's appointment-services SaaS platform from scratch using Angular, NestJS, and AWS serverless technologies.

At Agendacita, I owned frontend architecture, reusable components, backend APIs, third-party integrations, infrastructure, CI/CD, and production deployments. I've also modernized AngularJS applications at Svitla Systems, improved AI-assisted video creation workflows at simpleshow GmbH, and built wealth-management, telecom, analytics, and hotel-management products.

I enjoy reducing technical debt, creating maintainable component systems, and helping teams ship reliably. I'm comfortable working independently in remote-first environments, reviewing code, mentoring engineers, and collaborating asynchronously across time zones.

Experience

Work history, roles, and key accomplishments

Current

Technical Contributor / AI Coding Evaluator

Current

DataAnnotation

May 2026 - Present (4 months)

Evaluating AI-generated software-engineering solutions, focusing on TypeScript/JavaScript, code correctness, architecture, edge cases, and maintainability.

TypeScript JavaScript Code Review Software Architecture Edge Cases

Senior Software Engineer

simpleshow GmbH

Feb 2026 - May 2026 (3 months)

Developed frontend functionality for AI-assisted video creation workflows and content management systems. Contributed to modernization efforts and redesigned components to improve usability and consistency.

Angular TypeScript Frontend Development Component Design Modernization Collaboration

Senior Fullstack Software Engineer

Agendacita

Aug 2023 - Feb 2026 (2 years 6 months)

Designed and developed a SaaS platform from scratch using Angular, NestJS, and AWS serverless technologies. Built scalable frontend architecture, backend APIs, and CI/CD pipelines, owning responsibilities across frontend, backend, infrastructure, and deployments.

Angular NestJS AWS Lambda API Gateway DynamoDB Cognito S3 Serverless CI CD TypeScript JavaScript REST APIs Third Party Integrations Frontend Architecture

Senior Software Engineer

Svitla Systems

Mar 2022 - Aug 2023 (1 year 5 months)

Migrated AngularJS applications toward modern Angular architecture and delivered frontend functionality and modernization improvements. Modernized mobile applications by migrating from Ionic Cordova to Capacitor.

Angular AngularJS TypeScript JavaScript Migration Modernization Ionic Capacitor Code Review

Senior Software Engineer

Virtido

Dec 2020 - Dec 2021 (1 year)

Developed and enhanced functionality for SaaS wealth management systems, delivering frontend features and improvements across multiple product modules.

Angular TypeScript JavaScript Frontend Development SaaS Code Review

Team Lead / Senior Software Engineer

GlobalLogic

Oct 2019 - Dec 2020 (1 year 2 months)

Contributed to OTT applications across iOS, Android, Apple TV, and Android TV platforms. Coordinated development work, conducted code reviews, and mentored 6 junior developers.

Angular TypeScript JavaScript OTT iOS Android Code Review Mentor Team Leadership

Senior Software Engineer

Lagoteam

Nov 2018 - Oct 2019 (11 months)

Built analytics dashboards and reporting tools using Angular and D3.js, delivering interactive data visualization functionality across multiple dashboard modules.

Angular D3.Js Data Visualization Dashboarding Reporting Frontend Development

Senior Software Engineer

Wildix

Sep 2017 - Oct 2018 (1 year 1 month)

Developed functionality for VoIP and telecom systems, refactored legacy modules, created API documentation, and maintained browser extension functionality.

Angular TypeScript JavaScript VoIP Refactoring API Documentation Browser Extension

Software Engineer

Atniwe

Sep 2015 - Sep 2017 (2 years)

Developed hotel management platform functionality using Angular and backend integrations, migrating from AngularJS to modern Angular and restructuring frontend functionality.

Angular AngularJS TypeScript JavaScript Migration Frontend Development Backend Integrations

Software Engineer

zTeam

Sep 2013 - Sep 2015 (2 years)

Developed multiple business applications including websites, blogs, e-commerce solutions, and client-facing systems, building frontend functionality and integrating backend systems.

Angular TypeScript JavaScript Frontend Development Backend E commerce Solutions Web Development