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Sviatoslav Mysiv

Sviatoslav Mysiv

Senior Software Engineer

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

Background


About

About

Senior Software Engineer with 4+ years of experience building distributed, data-intensive web applications in TypeScript, React, Next.js, Node.js and Python. Designed and shipped systems handling 10K+ DAU, 10K+ daily orders and 50K+ daily job vacancies with 99.9%+ availability across B2B e-commerce and recruitment platforms. Strong in system design, distributed systems, algorithms and cross-team collaboration, driving projects from initial problem definition to production launch.

Work Experience

Work Experience

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

    Jan, 2025 - Present

    Senior engineer at Cloudflight delivering large-scale B2B e-commerce and enterprise design systems for international clients.

    • Lyreco Group (10,000+ employees) / May 2025 – Present

    • Contributed to a NextGen B2B e-commerce platform unifying 20+ countries into a single scalable system, replacing multiple legacy storefronts.

    • Participated in the development and optimization of front-end and BFF components in a high-load B2B checkout flow (10,000+ orders/day), ensuring stable performance and predictable scaling at peak load.

    • Worked closely with backend teams owning dozens of microservices, improving data consistency and contributing insights during design and API review processes. <br> <br>

    • Viasat (5,000+ employees) / Jan 2025 – May 2025

    • 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 scalable UI/UX practices across enterprise applications used by global users.

  • Founder & CTOOneTap.Work (part-time startup)

    Apr, 2024 - Present

    Founding engineer / CTO of a recruitment startup, owning architecture, delivery and reliability for high-traffic services.

    • Engineered a scalable microservices architecture for high-traffic workloads on TypeScript, Python from scratch, processing 50,000+ job vacancies daily with 99.9% uptime.

    • Designed a data-driven UX-first frontend, reducing average job search time from 40 to 5 minutes (8x 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 cross-functional team of 5 engineers (frontend, backend, marketing etc.), aligning roadmap, architecture decisions and delivery timelines.

  • Full Stack EngineerPlan A (contract via code.store)

    Jul, 2024 - Apr, 20259 months

    Full stack engineer on a CO2 emissions reporting SaaS platform for enterprise customers.

    • Developed core features for a CO2 emissions reporting platform, focusing on reliability and clear data visualisation.

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

    • Improved database and project architecture, simplifying data flows and reducing maintenance overhead.

    • Mentored developers on clean code, testing and performance optimization, raising overall team code quality.

  • Full-stack Developer, Examix & Independent Projects

    Jun, 2022 - Jul, 20242 years 1 month

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

    • Set up deployment and tooling (ESLint, Prettier, Vite, TypeScript) to ensure fast feedback cycles and consistent quality.

    • 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

    Mar, 2020 - Feb, 20221 year 11 months

    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

  • Computer Science & Engineering Practices

    System Design

    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

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

Education

Education

  • Artificial Intelligence, Bachelor's degree, WSB Merito University Gdańsk

    Jan, 2024 - Jan, 2027

  • Computer Programming, Specific Applications, Program, Mate academy

    Jan, 2023 - Jan, 2024