You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Savelii SychovSS

Savelii Sychov

Senior Software Engineer

€405/day
Berlin, DE
8-15 years

Average response time: 1 hour

About Savelii

Senior Software Engineer / Performance Engineer with over 10 years of professional experience in web development, specializing in web performance, benchmarking, and large-scale frontend systems. Strong expertise in analyzing, measuring, and optimizing web application performance across different devices and browsers, with a focus on real user metrics and synthetic benchmarking.

Extensive experience in designing and implementing scalable frontend architectures using modern web technologies, including React, TypeScript, and WebGL. Proven ability to build performance monitoring platforms, regression detection systems, and automated benchmarking tools that are used by multiple teams as a core part of incident investigation and release validation.

Experienced in leading cross-team and cross-functional performance initiatives, defining performance standards, best practices, and KPIs, and aligning engineering teams around measurable performance goals. Strong background in mentoring engineers, conducting technical reviews, and providing guidance on performance optimization and frontend architecture.

Hands-on experience with modern web platform APIs, browser internals, performance profiling tools, CI/CD integration, and end-to-end testing strategies. Comfortable working in complex product environments, collaborating with product managers, designers, and backend teams to deliver reliable, high-performance user experiences at scale.
  • English

    Native or bilingual

  • Ukrainian

    Native or bilingual

  • Czech

    Basic

  • German

    Conversational

Can work on-site
Berlin (up to 50km)

Experience

  • Miro
    Senior Software Engineer
    DIGITAL AND IT
    May 2022 - Today (4 years and 1 month)
    Berlin, Germany
    • • Developed tools and plugins for performance analysis
    • • Set up a benchmarking strategy enabling performance regression alerts for 8 teams
    • • Established end-to-end testing process for WebGL board rendering
    • • Board LoadingBenchmarking tool became the primary instrument for incident investigations
    Performance Optimization JavaScript Typescript Playwright WebGL
  • Microsoft
    Software Engineer II
    May 2020 - January 2022 (1 year and 8 months)
    Prague, Czechia
    • • Led onboarding redesign for Skype across platforms
    • • Integrated API updates for global age-rating law
    • • Chat bot integration settings for News and Skype Updates
    • • Conducted telemetry and user behavior analysis
  • Cabinet of Ministers of Ukraine
    Team Lead
    October 2019 - March 2020 (5 months)
    Kyiv, Ukraine, 02000
    • • Frontend development with Angular & Akita
    • • Integrated BPMN Activity Editor and Monaco-based XML Editor
    • • API integration with Ministry's document system

Recommendations

Be the first to recommend Savelii

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • BSc
    National University of Food Technologies
    2017
    BSc
  • BSc
    College of Information Systems and Technology
    2013
    BSc

Skill set

Categories