Daniel Kremniov, React Developer in Leeds, United Kingdom
Daniel Kremniov

React Developer in Leeds, United Kingdom

Member since March 29, 2022
Daniel is a front-end engineer with over seven years of commercial experience working for several UK and worldwide clients across marketing, travel, insurance, and finance industries. He specializes in sophisticated single-page front-end application development using React and TypeScript with an emphasis on testable architecture. Daniel’s clients describe him as a developer who can work well alongside other people and with an excellent eye for detail.
Daniel is now available for hire

Portfolio

  • Moody's
    React, TypeScript, JavaScript, Apollo, Cypress.io, Jest, GraphQL...
  • Right Thinking
    React, TypeScript, JavaScript, Webpack, Next.js, Server-side Rendering, Redux...
  • Icelolly Marketing
    JavaScript, Flow, React, Server-side Rendering, Next.js, Agile, HTML, CSS

Experience

Location

Leeds, United Kingdom

Availability

Part-time

Preferred Environment

MacOS, WebStorm, Slack, Azure DevOps

The most amazing...

...projects I've delivered allowed me to dive into the specifics of businesses and continuously drive improvements for products based on my previous experience.

Employment

  • Senior Front-end Developer (Contract)

    2020 - 2022
    Moody's
    • Developed highly interactive single-page applications with sophisticated business logic allowing users to optimize their investment strategies using underlying Moody’s products.
    • Spearheaded the delivery of project features with quality and promptly by the project front-end team.
    • Ensured that projects had a clear testing strategy and architecture.
    • Collaborated with back-end teams to manage cross-team dependencies and ensure that GraphQL APIs are easily consumable by the front end.
    • Maintained a mono-repo with reusable components consumed by dozen of other applications.
    Technologies: React, TypeScript, JavaScript, Apollo, Cypress.io, Jest, GraphQL, Reusable Libraries, Lerna, Unit Testing, HTML, CSS
  • Founder and Team Lead (Self-employed)

    2018 - 2020
    Right Thinking
    • Led a small team of front-end developers spread around the globe to deliver React applications for a number of clients.
    • Owned my team management alongside participating in project delivery as a developer.
    • Took charge of business management, communication with clients and their representatives, and developers' screening and hiring.
    Technologies: React, TypeScript, JavaScript, Webpack, Next.js, Server-side Rendering, Redux, UI, UX, Agile, Apollo, Cypress.io, Jest, Unit Testing, HTML, CSS
  • Lead Front-end Developer (Contract)

    2017 - 2018
    Icelolly Marketing
    • Engaged to perform the migration of a customer-facing website with performance enhancements in mind.
    • Identified and successfully eliminated issues with render-blocking scripts and ineffective JavaScript and CSS delivery.
    • Migrated the website to a standalone React architecture based on Node.js server-side rendering to utilize the Google PRPL pattern and optimize a critical rendering path.
    Technologies: JavaScript, Flow, React, Server-side Rendering, Next.js, Agile, HTML, CSS
  • Lead Front-end Developer (Full-time)

    2017 - 2017
    Icelolly Marketing
    • Delivered various scale improvements to the existing customer-facing website working closely with business stakeholders.
    • Increased website conversion by utilizing the A/B testing approach in close collaboration with the design team.
    • Tasked with authority to successfully make strategic decisions to modernize the technical stack and improve the reliability and maintainability of the front-end codebase.
    Technologies: React, Redux, JavaScript, Flow, Progressive Enhancement, HTML, CSS, A/B Testing
  • Web Developer

    2016 - 2017
    CPP Group
    • Engaged to develop a greenfield project using React and Redux technical stack within an agile team.
    • Worked on creating reusable components, shared component libraries, and style guidelines for future branded project developments.
    • Maintained and developed new features for the existing Angular application.
    Technologies: React, Redux, Jest, Reusable Libraries, CSS, Angular, HTML, Agile, JavaScript
  • Front-end Developer

    2015 - 2016
    Blueclaw Media
    • Delivered a large number of promotional projects with a relatively short lifespan.
    • Developed small but high-interactive responsive UIs working closely with a creative team.
    • Contributed to the user experience strategy planning and SEO.
    Technologies: HTML, CSS, JavaScript, jQuery, SEO Audits, UX
  • Front-end Developer

    2015 - 2015
    Visual & Softworks
    • Worked on front-end development in close collaboration with back-end developers and the creative team.
    • Successfully delivered several front-end applications.
    • Gained valuable experience in project management and face-to-face communication with clients.
    Technologies: HTML, CSS, JavaScript, Web Project Management

Experience

  • RiskIntegrity Investment Insight
    https://www.moodysanalytics.com/product-list/riskintegrity-investment-insight

    A highly interactive React-based single-page application that helps insurers build optimal investment portfolios and perform strategic asset allocation and portfolio risk measurement, monitoring, and governance using visualization.

    I have been working on this project for over a year, from the very start. I acted as a technical front-end lead owning planning features, allocating work for other front-end developers, managing cross-team dependencies, and developing the functionality myself.

    We managed to hit the business targets and successfully deliver multiple project iterations to clients with beta licenses throughout the time.

  • Holiday Comparison Platform

    A holiday comparison platform that enables users to search and compare international package holidays and local UK travel deals from the top travel companies.

    I was involved in developing multiple iterations of the React-based SSR web application and underlying systems such as the market-first bidding technology (BidAssist) to influence holiday deals' position and visibility within the search.

Skills

  • Languages

    TypeScript, JavaScript, HTML, CSS, GraphQL
  • Frameworks

    Redux, Jest, Cypress.io, Next.js, Angular
  • Libraries/APIs

    React, jQuery, Emotion Library, Highcharts
  • Tools

    Webpack, Lerna, Flow, WebStorm, Slack, Google Analytics
  • Paradigms

    Unit Testing, Agile, Progressive Enhancement, Azure DevOps
  • Other

    Apollo, Reusable Libraries, Server-side Rendering, UI, UX, SEO Audits, Web Project Management, A/B Testing, Adtech, Google Ads
  • Platforms

    MacOS

Education

  • Bachelor of Science Degree (Hons.) in Computing and IT (Software)
    2017 - 2020
    The Open University - Remote, United Kingdom

To view more profiles

Join Toptal
Share it with others