Hi, my name is Andrej Gajdos

I’m a React.js consultant for hire

React.js consultant for hire | Andrej Gajdos
React.js consultant for hire | Andrej Gajdos
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I have an existing React project.
  • Does it take a long time to implement new features?
  • Do React developers produce a lot of bugs?
  • The project is out of sync with design system and it’s always like this after new redesign?
  • React project tooling is broken?
  • React app is not performant and too slow?
  • Don’t know if it’s worth it to start using React Hooks?
I am going to build new React project.
  • What library and approach for managing global state is suitable for my project?
  • What libraries to use for building design system in React?
  • What libraries and approaches for styling are suitable for my project?
  • How to deal with dependencies among multiple React projects?
  • What tooling and project template is suitable for my project?
  • If I need server-side rendering or how to make React project seo optimized?
Get an advice from React.js consultant. SEE MORE


I am a React.js consulant and I have specialized in React since shortly after its release. I have partnered with developer teams worldwide to deliver complex React projects in many different industries. I have delivered React projects for solo founders, startups, digital agencies and big tech companies, such as Apple or Binance.

I have over eight years of experience in developing platforms, web applications, data visualizations, design systems, dashboards, websites in Next.js and various tools in React. Over the years, as I gained more experience in React, I noticed that even senior React developers don’t use React correctly. I came across a lot of React projects with bad code structure and broken tooling. I help and mentor senior React developers with best practices, design patterns and tooling to scale React.js applications in terms of maintainability and performance.

I offer my services as a React.js consultant for hire to work with businesses of all sizes. Feel free to get in touch. I’m available during the week to discuss and advise on your project or development needs.

[email protected]


Ongoing advice and code reviews

Regular code reviews and meetings with your team to ensure that your React project is well structured. Code quality is underestimated and it’s one of the most important aspects in software development. It can be evaluated only by React experts. I have came across too many broken React projects. Founders, even CTOs don’t know their React projects are broken. When they figure it out, they are looking for React experts, but it’s too late because technical debt is too big. Poor code structure:

  • Delays releasing your MVP for months and significantly slow down development
  • Cost you at least six figures, because you need to throw your project away and build it from scratch. If you decide to hire a React expert to fix the project, it can take months.

I will provide examples, pseudo-code and snippets to show your team how to structure the code and solve specific scenarios. Minimum price is $4,800/month.

Part-time development

If you feel like you need my help every day or every second day around 20-25 hours/week. I can be actively involved in the development process. I can help senior React developers on daily basis with best practices, design patterns and tooling to scale React.js projects.

Full-time development

I can commit full-time 40 hours/week. I enjoy development in React and working with talented teams.


Do you need a one time code review or anything else? I can go through your project quickly and produce a report with recommendations. Price for one-time quick code assessment is $1,500. If you are not satisfied, I will refund your money.


The decision of what technology to use should be based on project’s requirements and developer teams preferences. React became one of the best technologies for building complex user interfaces for number of reasons:


React.js is an open-source JavaScript library maintained by Facebook and a community of individual developers and companies. It’s frequently updated and appropriately supported. React is by far the most popular front-end library. It allows building UI elements by implementing reusable components and encourages code reusability. Any significant design can be broken down into components and developers can work individually on them. For this reason you can find a lot of libraries for React ecosystem that support and allow you to implement specific requirements easily. There are a lot of choices and only experienced React.js consultant know what libraries to use.

Efficiency and cost-effectiveness

One of the key elements of software development is efficiency and cost-effectiveness. We don’t want to reinvent the wheel and spend thousands of dollars for building a simple feature. Instead we can leverage React libraries that can save us a lot of time. This approach can be counterproductive and reusing existing code can be more time consuming than writing a new code from scratch. For this reason only React.js consultant who worked on many React projects is able to evaluate what approach should be chosen.


Verification is another aspect that shouldn’t be underestimated. Technology leaders use React for building user interfaces. React ecosystem provides libraries and tooling that is mature and without major issues and bugs. Every day we can see new frameworks, libraries and new React libraries with innovative approaches. We shouldn’t sacrifice technology maturity, otherwise we can come across obscure issues and spend more time fixing them instead of developing product features. Only experienced React.js consultant know how to determine technology maturity.


React Project | Developer Portfolio Item
Apple ***

Web portal in React.js, which allows Apple ***

  • React
  • Framer Motion
Website builder platform in React | Portfolio Item

Stackbit is a website builder that helps developers of any level to build their own Jamstack sites based on Next.js and Tailwind, fast. I helped Stackbit’s team to set up the tooling and design the architecture for design system of the main platform. I helped and mentored senior React developers best practices and what patterns to use to solve complex flows in React projects. I was working on fixing various issues and bugs in the platform. I was working on additional feature sets for enterprise clients. I worked as a full-stack developer in React.js, Node.js and MongoDB with focus on front-end development.

  • React
  • Node.js
  • MongoDB
  • Typescript
View project →
Frontend Technology Lead | Portfolio Item

Meridian provides next-gen, AI-powered workflow tools to private investors. As a Frontend Technical Lead, my responsibility was not just to manage but also to inspire and guide the front-end team through the intricacies of front-end development. One of my significant contributions was collaborating closely with the Product Designer. Together, we crafted a UI design system that was not just visually appealing but also intuitive and user-centric. This system became the cornerstone of the user experience, embodying the essence of Meridian’s innovative approach. I built the MVP from scratch and set up CI pipeline for Meridian’s UI.

  • React
  • Storybook
  • Typescript
View project →
Computational Tool | Developer Portfolio Item
System Master PLanner

A computational tool for master planners, energy/resource managers, and policy makers. It allows users to evaluate sustainability and resiliency scenarios for large portfolios of buildings and other assets.

  • React
  • Leaflet
Marketing website nextjs | Portfolio Item

A Corporate marketing website in Next.js. All pages are fully responsive and SEO optimised. I designed website’s CMS in Contentful and GraphQL is used for fetching and transforming data.

  • Next.js
  • Contentful
  • GraphQL
  • Mapbox


Andrej worked with our team to develop a rather complex web application using React. He joined us at a critical stage in the development process and was instrumental in guiding our team to adopt best practices for React and helping us implement more modular code.

We found Andrej to be very professional, a skilled and efficient programmer, and enjoyable to work with. He easily integrated with the rest of our team and was productive from day one. We would happily hire Andrej to work with us again.

Peter Ellis, President at Big Ladder Software

Andrej worked with Adapt Worldwide in 2019, developing multiple React widgets for a major marketing campaign. Andrej exceeded our expectations beyond measure through his skill and dedication.

Communication with Andrej was fluid and uncomplicated, and he always went above and beyond to not only ensure the project was promptly delivered, but that it was done so to an immaculate standard. His insight and experience was hugely valuable to the project; Andrej truly helped us shape our vision and reach our goals with strong execution.

I would highly recommend Andrej as an exceptional React developer who is completely dedicated to producing quality, functional, engaging content. It would be an absolute pleasure to work with Andrej again in the future.

Michael de Alwis, Creative Content Executive at Adapt Worldwide

Andrej was a key contributor to a complex, critical React web application. His work is timely and thoughtful, and he’s a great communicator and team player. We hope to work with him again soon.

Jacob Budin, Development Manager at Kettle

After working with over a dozen developers from several different countries, it was absolutely refreshing to have had the pleasure to work with Andrej in building a full stack, dynamic web app.

Andrej has all of the required technical expertise that one could hope for when it comes to building a highly scalable and dynamic website. For me, this meant taking designs from an early stage and building the entire front and back end of the project, release ready.

He also exhibits a particular pride in his attention to detail (a trait which had been hard to find previously). This meant that after giving Andrej direction, you can always be confident that the code will be delivered exactly as required. Equally in my experiences, If Andrej see’s a better method, he will always suggest it, helping us end up with the best product possible.

All in all, Andrej was indispensable to our team and certainly one of the best developers that I have had the pleasure to work with.

Marcus Scott, Founder and Director of SayCaster (rebranded to Bitcast)

I had the pleasure of managing Andrej for about 1 year at Zeroturnaround. His natural ability to recognize deficiencies and address them made him an immediate asset to the team and the company.

Andrej would regularly think of different ways to provide our clients with the best grasp of the benefits that our tools offered. This allowed him to grow in respect from our clients and his co-workers. Andrej was a pleasure to work with and is always looking for ways to provide himself with personal growth.

Andrej also is an excellent orator. His clear and concise voice allowed customers to feel comfortable working with him and collaborating with him. This lead to his sales team being able to close many deals that they were previously unable to close.

I would love to be able to work with Andrej again someday and comes with my highest of recommendations.

Curtis Johnson, Sales Engineering Manager at ZeroTurnaround (acquired by Rogue Wave Software)

Andrej was a great help in creating a vision and front-end prototype for our startup. I have very little technical knowledge, and he was so knowledgeable in finding us technologies that would work for our needs. He is very professional, friendly, honest, and his communication is excellent. I highly recommend Andrej!

Carlene Takaki, Professional Swim Coach at Palo Alto Stanford Aquatics
React.js Apps I have delivered React projects as a solo developer or as a team member of remote developer teams across different time zones. I have built React projects from scratch or fixing React projects with broken code structure. With more than eight years of experience with React in different industries I know how to structure complex React projects.
Design Systems I’m UI oriented and that’s the reason why I specialize in React. I enjoy building design systems in React. I have a lot of experience in developing animations and css development. I know how to build complex design system easily and fast without UI frameworks.
Data Visualizations I have built various dashboards and data visualizations in React. I have experience in building data visualizations in D3.js and mapping functionalities in Mapbox and Leaflet. I have worked on data management products, exchange platforms and dashboards for portfolio management.


A Leaflet Developer’s Guide to High-Performance Map Visualizations in React

Are you gearing up to create a map visualisation that handles a large dataset? I’m excited to guide you through the process of crafting interactive map visualizations while sidestepping pitfalls. Drawing from my experience as a freelance React and Leaflet developer, I encountered diverse requirements for map visualizations—rendering extensive datasets, creating interactive visuals, and managing the drawing of various shapes.

React Class Components vs Functional Components with Hooks: A Never Ending Story

A lot of developer teams choose to use React class components instead of functional components with hooks for the wrong reason. To me, it’s surprising to see this discussion over and over again. React released hooks over two years ago, it’s a proven approach and many developers are still not sure if it’s a good idea to use them or not.

CSS Reset for better Flexbox and CSS Grid responsive layout

This is a CSS Reset for Flexbox and CSS Grid which helps you to avoid issues in responsive layouts. It is one simple CSS rule which I noticed in a UI framework. There aren’t any odd consequences and I wish it was by default in all browsers. In case you don’t know about css normalizers and css resets, you can check this blog post. Most of them don’t solve flexbox issues.

Single-Page Application vs Multiple-Page Application: Which One To Choose For Your Project

In this post I’m going to break down EVERYTHING about single-page application vs multiple-page application. So if you are looking for a DEEP comparison of these two types of web applications or websites, you’ve come to the right place. In this post, you will learn which projects are better to develop as a single-page application (SPA) or multiple-page application (MPA). You will see what single-page applications have in common as well as multiple-page applications and how to improve them.

Freelance React Developer’s Checklist

Whether you are a freelance React developer or you do another kind of freelance work on short term projects, you can recognize similar patterns in your workflow. I found similar patterns in process of building React.js projects. In almost every project, I need to ask for clarification or similar questions in regards to graphic design. This checklist is not only for freelance React developers, but it can be helpful for others who work closely with developers, such as project managers or graphic designers. I use this checklist before starting building the project and after agreement with client.

Orchestrating animations with Framer Motion in React.js

Framer Motion is an open-source motion library, which drives Framer X’s animations and gesture capabilities in React.js projects. If you are familiar with Popmotion, Framer Motion is the successor to the popular Pose animation library. Both libraries provide declarative API, which makes creating and orchestrating animations in React.js projects easy to implement.


I’m ready to hear about your project. Don’t hesitate to get in touch with me using the contact form.

    What type of project do you need completed?

    This will help me understand the basic needs of your project and set the right budget and timeline expectations.

    Which services do you need?

    Please specify the type level of completion you'd like me to deliver on this project.

    Ongoing advicePart-time developmentFull-time developmentOne-time assessmentOther

    What's the budget for your project?

    This will help me guide you toward the most appropriate solution within your budget. Consider this a starting point to our conversation, not a final quote.

    When do you need this project completed?

    Select the option that best expresses your expectations for the timeline of this project.

    [email protected]