
Kostiantyn Ivannikov
@kostiantynivannikov
I build and modernize scalable Angular, Node.js, and AWS SaaS products.
What I'm looking for
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
Technical Contributor / AI Coding Evaluator
DataAnnotation
May 2026 - Present (4 months)
Evaluating AI-generated software-engineering solutions, focusing on TypeScript/JavaScript, code correctness, architecture, edge cases, and maintainability.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Education
Degrees, certifications, and relevant coursework
Khmelnytsky National University
Master's Degree, Software Engineering
Grade: with distinction
Master's Degree in Software Engineering with distinction.
Tech stack
Software and tools used professionally
Availability
Location
Authorized to work in
Job categories
Skills
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