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Sviatoslav Mysiv

Sviatoslav Mysiv

Senior Software Engineer

Gdańsk, Poland (Open to relocation)
+48 731 476 397
English, Polish, Ukrainian

Background


Work Experience

Work Experience

  • Senior Software Engineer (Frontend-focused), Cloudflight (~1,000 employees)

    Jan, 2025 - Present

    • Lyreco Group (10,000+ employees)

    • Optimized checkout flow, reducing add‑to‑payment time by 6×.

    • Helped launch a NextGen B2B e‑commerce platform that unified users across 20+ countries.

    • Developed and improved front‑end and BFF components for a high‑load B2B checkout handling 10,000+ orders/day.<br> <br>

    • Viasat (5,000+ employees)

    • Engineered an enterprise-grade UI library (React, Web Components) reused across multiple high-traffic applications with 10K+ daily users.

    • Contributed to a centralized design system for cross-functional teams, establishing extensible UI/UX practices across enterprise applications used by global users.

  • Founder & CTO (Part-time), OneTap.Work (Startup)

    Jan, 2024 - Present

    • Designed a scalable microservices architecture processing 50k+ new daily vacancies with 99.9% uptime.

    • Designed a data-driven UX-first frontend with Next.js. Reduced average job search time from 40 minutes to 5 minutes, an 8× improvement.

    • Implemented CI/CD for 10+ microservices, cutting deployment time by ~65% via Docker automation.

    • Built a custom vacancy classification model (92% F3.5-score) using ML/NLP, improving matching quality vs. previous baselines.

    • Coordinated a team of 5 people (frontend, backend, marketing), aligning roadmap and architecture decisions.

  • Full Stack Engineer, Plan A (contract via code.store)

    Jan, 2024 - Jan, 20251 year

    Core engineer for a CO2 emissions SaaS. Full-time contract concluded in Jan 2025; retained on an on-demand advisory basis until Apr 2025 to support handover.

    • Enhanced database architecture by eliminating 10+ redundant tables, simplifying data flows and reducing technical debt

    • Transitioned to an Advisory Role (Jan–Apr 2025) to mentor incoming engineers during the handover phase while starting a new position.

    • Developed core features for a CO2 emissions reporting platform

    • Built custom TypeScript / React components integrated with low-code tools, enabling rapid iteration while keeping a clean architecture

  • Full-stack Developer, Examix & Independent Consultancy

    Jan, 2022 - Jan, 20242 years

    Full-stack engineer building an edtech platform and multiple independent frontend projects.

    • Designed and implemented the core backend architecture for an edtech platform using Nest.js, Redis, Prisma and PostgreSQL.

    • Led an engineering team (4 people): performed code reviews, enforced coding standards and aligned on architecture decisions.

    • Built ~20 React + Redux apps and 10+ landing pages (HTML/SCSS/JS), covering common real-world scenarios and edge cases.

  • Independent IT Technician and Systems Builder, SoftPC

    Jan, 2020 - Jan, 20222 years

    Co-founded a small technical service business focused on custom PC assembly, maintenance and repair.

    • Assembled and maintained 100+ custom PCs, ensuring stability and performance for gaming and workstation use cases.

Skills

Skills

  • Programming Languages

    TypeScript

    JavaScript

    Python

    SQL

  • Frontend Engineering

    React

    Next.js

    Web Components

    Lit.js

    Redux

    Design Systems

    Accessibility

    Performance Optimization

    User Experience (UX)

  • Backend & Distributed Systems

    Node.js

    NestJS

    Express.js

    Microservices

    REST APIs

    GraphQL

    Redis

    PostgreSQL

    Prisma

    Kafka

    CI/CD

    Docker

    GCP

    AWS

  • Computer Science & Engineering Practices

    Git

    Agile

    Scrum

    Leadership

    TDD

    System Design

    Test Automation

    Scalability

    High-load Systems

    Testing & Code Quality

    Code Review

    Mentoring

    Machine Learning (ML/NLP)

  • Algorithms & Problem Solving

    Strong data structures & algorithms skills

    Problem Solving

    Time and Space Complexity

    300+ problems on LeetCode & CodeWars: graphs, DP, system design-related tasks

Education

Education

  • Computer Science & Artificial Intelligence (Part-time / Weekend studies), Bachelor's degree, WSB Merito University Gdańsk

    Jan, 2024 - Present

  • Full Stack Web Engineering, Professional Certificate, Mate academy

    Jan, 2023 - Jan, 2024

Volunteer Work

Volunteer Work

  • Creator & Lead Maintainer, Open Source

    Jan, 2025 - Present

    Authored 'prisma-data-migrations', a CLI tool designed to manage version-controlled data migrations for Prisma ORM, addressing a key functionality gap in the official ecosystem.