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Ihor Olshevskyi

Ihor Olshevskyi


Valencia, ES
Ukrainian, Russian, English

Background


About

About

Senior Full-Stack Engineer and Tech Lead with 11+ years of experience building and scaling SaaS products. Delivered architecture, implementation, and team leadership across fintech, legaltech, LMS, and platform modernization initiatives. Strong hands-on background in Node.js, TypeScript, React, cloud infrastructure, and multi-tenant systems. Focused on production reliability, secure delivery, and measurable business outcomes.

Work Experience

Work Experience

  • Tech Lead, Yojji

    Oct, 2019 - Mar, 20266 years 5 months

    Led architecture and delivery of concurrent multi-tenant SaaS products across fintech, legaltech, restaurant-tech, and LMS/community platforms.

    • Led concurrent delivery for Valapay, Pay OSU, CSI Helsinki, Appfront, and Convoy of Hope LMS initiatives.

    • Designed and implemented multi-tenant architecture, tenant isolation, and secure environment provisioning.

    • Owned cloud and delivery practices across Azure and AWS, including CI/CD and deployment automation.

    • Drove major modernization programs, including GraphQL refactoring and large-scale data migration to PostgreSQL.

    • Managed cross-functional teams across backend, frontend, mobile, and DevOps streams.

    • Established observability and reliability practices with monitoring, alerting, and operational runbooks.

    • Supported pre-sale and discovery phases through technical planning, estimation, and architecture recommendations.

  • Full-Stack Engineer, Self-Employed (Freelance)

    Apr, 2016 - Sep, 20193 years 5 months

    Delivered freelance SaaS and platform engineering projects via direct client engagements, primarily through Upwork.

    • Built and shipped full-stack applications for LMS, inspection/certification, and developer tooling use cases.

    • Designed API layers and data models using Node.js, Express/Hapi, PostgreSQL, and MongoDB.

    • Implemented SSR React frontends and interactive dashboards with reusable component systems.

    • Developed secure containerized code execution workflows and Kubernetes-based orchestration for online IDE use cases.

    • Handled end-to-end project ownership from requirements to production delivery and ongoing iterations.

  • Full-Stack / Backend Developer, Devico Solutions

    Jun, 2014 - Mar, 20161 year 9 months

    Worked on production SaaS systems for monitoring and healthcare-adjacent workflow management, progressing into team leadership responsibilities.

    • Built high-load monitoring services with distributed checks, alerting flows, and payment integrations.

    • Contributed to a HIPAA-compliant dental case management platform with React frontend and robust backend services.

    • Participated in architecture decisions, code reviews, and team coordination as lead developer on key modules.

    • Delivered scalable features on PHP/Zend + Node.js stacks with attention to reliability and secure data handling.

Projects Experience

Projects Experience

  • CSI Helsinki (CSI Lawyer)

    Jul, 2021 - Sep, 20243 years 2 months

    Multi-tenant legaltech SaaS modernization for law firms with secure tenant isolation and cloud-native operations.

  • Appfront

    Jan, 2023 - Mar, 20263 years 2 months

    Restaurant SaaS modernization: GraphQL refactor, authentication migration, and deployment automation.

  • CDMBase

    Jan, 2016 - Jun, 20182 years 5 months

    Web-based IDE with secure containerized code execution and Kubernetes orchestration.

  • Arklign

    Apr, 2015 - Mar, 201611 months

    HIPAA-compliant dental workflow SaaS with real-time collaboration and case tracking.

Skills

Skills

  • Backend & APIs

    Node.js

    NestJS

    Express.js

    GraphQL

    OpenAPI

    PostgreSQL

    MongoDB

    Golang

  • Frontend & Mobile

    React

    React Native

    TypeScript

    Redux

    TanStack React Query

    Ant Design

    MUI

    Next.js

  • Cloud & DevOps

    Microsoft Azure

    AWS

    Kubernetes

    Azure DevOps

    Serverless Framework

    CI/CD

    Prometheus

    Grafana

  • Architecture & Delivery

    Multi-tenant SaaS

    System Design

    Technical Leadership

    Mentoring

    Security & Compliance

    Pre-Sale

    Legacy Modernization

Education

Education

  • Computer Science, College Diploma, Kharkiv Radio Technical College

    Sep, 2011 - Jul, 2015

Certificates

Certificates