# Kostiantyn Diachenko

> Senior Software Engineer at Sigma Software Group 👨‍💻

Location: Pleasanton, California, United States
Profile: https://flows.cv/kostiantyn

Customer-focused software professional with superior communication skills and expertise in various technical platforms. Understands and meets both client and employer needs and develops highly functional, robust, and easy-to-use applications. Excels as a hands-on developer and oversees the work of software teams. Optimizes structures and processes to accomplish customer targets and promote company loyalty.

## Work Experience
### Software Engineer @ Kubit
Jan 2022 – Present | San Francisco Bay Area

### Web Developer @ Freelancer
Jan 2017 – Present | Kyiv, Kyiv City, Ukraine

### Senior Software Engineer @ Sigma Software Group
Jan 2021 – Jan 2022 | Kyiv, Kyiv City, Ukraine
- Developed high-quality, scalable APIs using NodeJS, GraphQL, TypeORM, and PostgreSQL.
- Built interactive web-based user interfaces leveraging TypeScript, React, GraphQL, and styled- components.
- Provided technical support using knowledge of complex technology to solve problems and support new projects.
- Promoted technical leadership to entry-level and junior engineers in complex enterprise system environments.
- Updated old code bases to modern development standards which allowed to speed up feature delivery by 50%.
- Integrated Apollo Studio which will help to find expensive queries and mutations.

### Software Engineer @ NewAge IO
Jan 2017 – Jan 2021 | Kyiv, Kyiv City, Ukraine
- Built micro front-end web applications leveraging TypeScript, React, and GraphQL which reduced code base complexity and downtime to almost 0.
- Employed peer code review to better delegate error-checking duties and enhance debugging outcomes.
- Collaborated with management, and internal and development partners regarding software application design status and project progress.
- Developed a react-app template for a customer project, which accelerated the development process by 5 times.
- Provided guidance and mentored less-experienced team members.
- Followed SDLC best practices within an Agile environment to produce rapid iterations for clients.

### Junior Front End Developer @ Ermilovemarketing
Jan 2016 – Jan 2017 | Kyiv, Kyiv City, Ukraine
- Coded using HTML, CSS, and JavaScript to develop features for both mobile and desktop platforms.
- Produced websites compatible with multiple browsers.
- Designed and updated layouts to meet usability and performance requirements.
- Collaborated with stakeholders during development processes to confirm creative proposals and design best practices.
- Translated UX and business requirements into elegant code solutions.
- Identified and resolved website performance flags to improve functionality.
- Worked cooperatively with client services, sales, and design team in deadline-driven environment


## Education
### Bachelor's degree in Radio engineering
National Technical University of Ukraine 'Kyiv Polytechnic Institute'​
Jan 2012 – Jan 2016


## Contact & Social
- LinkedIn: https://linkedin.com/in/diachenkokostiantyn

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Source: https://flows.cv/kostiantyn
JSON Resume: https://flows.cv/kostiantyn/resume.json
Last updated: 2026-03-20