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Senior Full-Stack Developer and Technical Lead with 20+ years of experience building scalable SaaS platforms and leading high-performance engineering teams. Successfully scaled applications from prototype to 40,000+ users while maintaining 99.9% uptime. Proven expertise in cloud architecture, microservices, and modern development practices. Seeking to leverage entrepreneurial experience and technical leadership skills in an established technology organization.…Senior Full-Stack Developer and Technical Lead with 20+ years of experience building scalable SaaS platforms and leading high-performance engineering teams. Successfully scaled applications from prototype to 40,000+ users while maintaining 99.9% uptime. Proven expertise in cloud architecture, microservices, and modern development practices. Seeking to leverage entrepreneurial experience and technical leadership skills in an established technology organization.

Sergey Demidenko

Full Stack Developer, Front-End Developer, Back-End Developer, +2

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Senior Full-Stack Developer and Technical Lead with 20+ years of experience building scalable SaaS platforms and leading high-performance engineering teams. Successfully scaled applications from prototype to 40,000+ users while maintaining 99.9% uptime. Proven expertise in cloud architecture, microservices, and modern development practices. Seeking to leverage entrepreneurial experience and technical leadership skills in an established technology organization.…Senior Full-Stack Developer and Technical Lead with 20+ years of experience building scalable SaaS platforms and leading high-performance engineering teams. Successfully scaled applications from prototype to 40,000+ users while maintaining 99.9% uptime. Proven expertise in cloud architecture, microservices, and modern development practices. Seeking to leverage entrepreneurial experience and technical leadership skills in an established technology organization.

Available to hire

Senior Full-Stack Developer and Technical Lead with 20+ years of experience building scalable SaaS platforms and leading high-performance engineering teams. Successfully scaled applications from prototype to 40,000+ users while maintaining 99.9% uptime. Proven expertise in cloud architecture, microservices, and modern development practices. Seeking to leverage entrepreneurial experience and technical leadership skills in an established technology organization.

Skills

Experience Level

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Work Experience

Co-Founder & Technical Lead at GrassEqual / Party Labz

June 1, 2023 - Present

Leading technical strategy for an event management SaaS platform serving 40,000+ active users; designed multi-tenant SaaS architecture on Azure, mentored a 3-person development team, established code review standards, CI/CD pipelines, and AI-enabled customer support bots; delivered key features including the Party Labz SaaS platform, VenueBoards MVP, ILI Dashboard MVP, Family Harmony AI Coach Bot, and Square integration.

Senior Full-Stack Software Engineer at My Digital Office

June 30, 2023 - October 3, 2025

Led engineering for a mission-critical hospitality analytics SaaS, managing a globally distributed team of 6 engineers across 12-hour time zones; designed and implemented AWS-based serverless and microservices architecture (Lambda, RDS, ECS/Fargate, S3); improved system reliability and deliverables; implemented CI/CD and AI-powered chatbots; delivered 5 major product features from concept to production.

Senior Full-Stack Software Engineer at HyperGiant (Consulting)

February 28, 2021 - October 3, 2025

Delivered full-stack solutions for Fortune 500 clients and startup MVPs; built MVPs for Disney and Shell; rapid prototyping to deliver functional prototypes within 6-8 week cycles; full-stack development (React frontend, Node.js backend, REST APIs, database solutions); established coding standards, documentation, CI/CD pipelines, and stakeholder collaboration, with dashboards used by 1,000+ hotel properties.

Senior Full-Stack Software Engineer at Shaw Communications

February 28, 2019 - October 3, 2025

Contributed to Shaw Business’s corporate website and service portals; built responsive React components and REST APIs integrated with enterprise systems like Salesforce; promoted collaboration with stakeholders to ensure successful delivery.

Software Engineer / Team Lead at Various (Energy, Telecom, Enterprise Software)

December 31, 2015 - October 3, 2025

Progressed from a developer to a team lead across energy, telecom, and enterprise software projects in Belarus, Russia, and Canada; led teams to build large-scale telecom billing systems and migrate legacy applications to modern web platforms, gaining extensive international experience.