Valeriy is available for hire
Hire ValeriyValeriy Efimenko
Verified Expert in Engineering
Software Developer
Location
Tbilisi, Georgia
Toptal Member Since
October 26, 2022
Valeriy is a principal developer and architect with over 14 years of experience. He has spent more than seven years focused on professional web development. His broad experience in various fields, such as web development, management, sales, marketing, and eCommerce, gives him a unique perspective on how to solve problems. Passionate about his field, Val is constantly improving his skills and adopting cutting-edge technologies.
Portfolio
Intelligent University
JavaScript, TypeScript, PostgreSQL, Redis, Webpack, React, REST, Docker...
Independent Consultancy
JavaScript, TypeScript, React, Go, PostgreSQL, Redis, REST, Full-stack...
Hommz Technologies Ltd
React, Node.js, PostgreSQL, Full-stack, TypeScript, REST APIs...
Experience
Availability
Full-time
Preferred Environment
Visual Studio Code (VS Code), Terminal, Git, MacOS, Linux, Full-stack
The most amazing...
...thing I've created is a service mesh to streamline the local development experience, resulting in better team productivity.
Work Experience
Chief Technology Officer
2022 - PRESENT
Intelligent University
- Assembled, led, and mentored a remote team of four to seven developers.
- Designed and developed a platform solution with a proven stack of technologies and sophisticated tools for developer experience.
- Developed a proof-of-concept web application and launched it as a minimum viable product (MVP).
Technologies: JavaScript, TypeScript, PostgreSQL, Redis, Webpack, React, REST, Docker, Microservices, Agile, Web Development, Full-stack, Leadership, Architecture, Software Architecture, APIs, Airtable, REST APIs, Back-end, Back-end Development, CSS, Single-page Applications (SPA), Software Design, Scalable Architecture, Requirements Analysis, HTML, Front-end, React Router, Technical Leadership, HTML5, Tailwind CSS, CTO, Full-stack Development, Front-end Architecture, Mentorship & Coaching, Code Auditing, SQL, Three.js, NPM, GitHub, Authentication, WebSockets
Consultant and Architect
2018 - PRESENT
Independent Consultancy
- Contributed to many small React web apps. Provided tailored boilerplates and sophisticated component systems for most of them.
- Worked on architecture for several medium-sized web apps. Planned and implemented best practice architectural solutions regarding scalability, maintainability, security, cost-efficiency, etc.
- Led a few teams through a modernization process, including incremental adoption of React and TypeScript.
- Created an MVP for a few projects. Assembled and educated teams to continue the development process.
- Anticipated future offers and developed tools and solutions to be applied in projects.
Technologies: JavaScript, TypeScript, React, Go, PostgreSQL, Redis, REST, Full-stack, Architecture, Software Architecture, APIs, Next.js, Airtable, REST APIs, API Integration, Microservices, Back-end, Back-end Development, CSS, Single-page Applications (SPA), Software Design, Scalable Application, Scalable Architecture, Requirements Analysis, Streaming, Video Streaming, GraphQL, Amazon Web Services (AWS), Vue, HTML, Front-end, React Router, Redux, Jira, Technical Leadership, HTML5, Tailwind CSS, Storybook, Full-stack Development, Front-end Architecture, Mentorship & Coaching, Code Auditing, SQL, Three.js, Supabase, React Query, NPM, GitHub, Vercel, Authentication, WebSockets, OAuth, SDKs, SCSS
Senior Full-stack Developer
2022 - 2023
Hommz Technologies Ltd
- Led an architectural upgrade that cut the project's launch times from 20 seconds to 5 seconds on high-end devices and from 60-90 seconds to 16-20 seconds on standard devices.
- Reduced hot reload duration from an erratic 5-10 seconds to consistently under one second, saving developers 1.3 to 2.25 hours weekly. These improvements led to a cumulative saving of 52 to 90 hours monthly for a team of 10 developers.
- Prepared the platform for future upgrades in the React ecosystem, migrating to the latest version of the packages, ensuring a smoother user experience and more efficient code execution.
- Developed a custom calendar section on the platform that integrates with all internal systems where data is collected, enhancing the sales team's ability to make data-driven decisions.
Technologies: React, Node.js, PostgreSQL, Full-stack, TypeScript, REST APIs, Full-stack Development, Front-end Architecture, Code Auditing, SQL, React Query, Maps, NPM, GitHub, NestJS, Authentication, WebSockets, SCSS
Team Lead and Architect
2021 - 2021
Praqticom
- Led incremental modernization of a technology stack.
- Established an onboarding process and assembled a team.
- Developed a set of sophisticated scripts to automate tasks throughout the project and improve the developer experience.
Technologies: Go, JavaScript, Docker, React, PostgreSQL, Node.js, Redis, TypeScript, Webpack, Full-stack, Leadership, Architecture, Software Architecture, APIs, REST APIs, Microservices, Back-end, Back-end Development, CSS, Single-page Applications (SPA), Software Design, Scalable Architecture, Requirements Analysis, HTML, Front-end, React Router, Technical Leadership, HTML5, Tailwind CSS, Full-stack Development, Front-end Architecture, Mentorship & Coaching, Code Auditing, SQL, React Query, NPM, GitHub, SCSS
Founder and CEO
2019 - 2020
Tralents
- Automated a screening stage of a recruitment process by eliminating the need to review a majority of candidates using a set of interactive tools.
- Developed tailored business simulations and serious games for a number of clients.
- Created a set of boilerplates to scaffold client-requested solutions in a matter of hours.
Technologies: JavaScript, Node.js, PostgreSQL, Redis, REST, Vue, Excel 365, Full-stack, Leadership, Architecture, Software Architecture, APIs, REST APIs, Microservices, Back-end, Back-end Development, CSS, Software Design, HTML, Front-end, React Router, HTML5, Full-stack Development, Front-end Architecture, Mentorship & Coaching, SQL, Three.js, NPM, GitHub, SCSS
Business Development Director
2017 - 2018
Brandquad
- Led a business development team to grow from four corporate clients to more than ten in a year.
- Managed a process of negotiating, onboarding, and developing custom solutions for the most important clients.
- Developed three solutions adopted by a business and included in a services pool.
Technologies: Negotiation, Sales, Jira
Management Trainee
2015 - 2017
Unilever
- Developed a dynamic analytical tool to generate and visualize reports on distribution coverage with Microsoft Excel.
- Developed a sales fraud detection tool with Microsoft Excel.
- Participated in creating a local market eCommerce department.
- Led integration of a PIM SaaS solution with an internal master data management (MDM) system.
- Participated in landing a global concept and localization for the launch of nine stock-keeping units (SKUs) for the brand Axe (Lynx).
- Used social platform APIs to develop target lists for context advertisements that increased engagement rates up to three times.
- Volunteered to organize an event for more than 600 students as a part of an employer brand strategy.
- Prepared a massive dataset for distribution coverage potential for a big data project with 30 days deadline within three days.
Technologies: Sales, B2C Marketing, Team Leadership, Excel 365, Leadership
Intern
2015 - 2015
Unilever
- Took a leading role in a sales team assessment project for three countries with over 1,500 employees.
- Delivered three-month term project target results in two months.
- Received a recommendation letter for a management trainee program first of all interns.
Technologies: Human Resources (HR), Excel 365
Freelancer
2011 - 2015
Self-employed
- Learned web development on my own while studying at a university.
- Participated in projects with higher skill requirements to develop proficiency.
- Delivered results under high pressure and with vague requirements.
- Developed and supported multiple client projects simultaneously.
Technologies: HTML, CSS3, APIs, CSS, Front-end
Experience
The HUB | Developer Experience and Automation
A custom service mesh to streamline the local development experience. These simple configurations and automatic service discovery allow building a microservice architecture with ease. The main features include the following:
• Predetermined sets of resources that can be launched with one command
• Graph-based module dependencies
• Every resource on request
• Release resources on code change
• Automatic recovery on a fatal failure
• Asynchronous execution
• Close to production environments to eliminate discrepancies
• Predetermined sets of resources that can be launched with one command
• Graph-based module dependencies
• Every resource on request
• Release resources on code change
• Automatic recovery on a fatal failure
• Asynchronous execution
• Close to production environments to eliminate discrepancies
PostgreSQL Migration Scripts
A set of custom scripts to help with migrations without a hustle during the prototyping stage when building a microservice. It enables rapid development by applying migrations and seed data from scratch as a list of SQL files executed sequentially.
React Boilerplate
A custom monorepo boilerplate for rapid prototyping with webpack, React 18, TypeScript, ESLint, and Tailwind CSS. I also added custom production and development servers with server-side rendering (SSR).
Transactional SMTP Service
Created a custom transactional SMTP service for internal and client use. The following jobs were done while making it:
• SPF, DKIM, DMARC, and TLS protocols
• Multiple domains
• Message broker
• Email verification and DNS record resolver
• IP reputation improvements
• SPF, DKIM, DMARC, and TLS protocols
• Multiple domains
• Message broker
• Email verification and DNS record resolver
• IP reputation improvements
Skillset
Languages
JavaScript, TypeScript, HTML, CSS, HTML5, SQL, Go, GraphQL, SCSS, CSS3, Bash Script
Frameworks
Tailwind CSS, Next.js, Redux, NestJS
Libraries/APIs
React, Node.js, REST APIs, React Router, Vue, React Query, Three.js
Paradigms
REST, Scalable Application, Requirements Analysis, Microservices, Agile
Other
Web Development, Full-stack, Architecture, APIs, Back-end, Back-end Development, Single-page Applications (SPA), Software Design, Scalable Architecture, Front-end, Full-stack Development, Leadership, Software Architecture, API Integration, Technical Leadership, CTO, Front-end Architecture, Mentorship & Coaching, Code Auditing, Authentication, WebSockets, Negotiation, Sales, B2C Marketing, Team Leadership, Human Resources (HR), Excel 365, ESLint, Monorepos, Webpack 5, SMTP, Airtable, Streaming, Video Streaming, Storybook, Supabase, Maps, OAuth, SDKs
Tools
Webpack, Git, GitHub, Jira, NPM
Platforms
Docker, Linux, Amazon Web Services (AWS), Vercel
Storage
PostgreSQL, Redis
Education
2010 - 2015
Specialist Degree (Equivalent to Master's Degree) in Project Management
Moscow City Pedagogical University - Moscow, Russia
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