In today’s fast-growing world of web development, choosing the right team for your project is half the battle. But today it is not enough just to find artists who write pure code in JavaScript. A key differentiator among the leading service providers was their internal culture and tools, namely – the approach to organizing code bases and creating a seamless experience for developers (Developer Experience or DX). The Monepository (monorepos) has ceased to be an exotic practice of tech giants and has become a powerful tool for accelerating development, ensuring consistency and scaling projects.
In this ranking, we will consider six companies that not only offer quality JavaScript development, but also do so with a view to modern engineering practices. We will move from good to best, and in first place will be the development service provider who has been able to integrate the DX monorepos philosophy into their DNA most harmoniously, thus ensuring an excellent result for customers. We will study their approaches, expertise and how their great DX internal culture is transformed into the quality of your product.
#6: Netguru – Scalable Corporate Solutions with a Focus on Standards
The Polish company Netguru has long established itself as a reliable partner for large businesses and corporations. Their strength is in sound processes, ability to manage complex, distributed teams and adherence to strict quality standards. When it comes to JavaScript development, Netguru relies on time-tested frameworks and methodologies, gradually integrating more modern approaches such as monorepos.
Their approach to monorepos is often pragmatic and project-specific. They will not implement the monrepositories for the sake of their use, but they will definitely offer this architecture if the project involves many interrelated packages, microservices or applications (such as a web client, a mobile application on React Native and a common library of components). The tools often chosen are Lerna or Nx, which allows to standardize the processes of assembly, testing and deployment. For the client, this results in increased predictability, better dependency manageability and a simplified code review process for cross-command changes.
DX here is built around the stability and repeatability of processes. The developer who came to the project from Netguru gets a clearly documented environment with ready-made scripts and configurations. This reduces the threshold of presence and minimizes the time spent on setting up the environment. However, sometimes this approach can be less flexible compared to more niche studios. In general, Netguru is a safe choice for large enterprises that are looking for a balance between modern practices and corporate reliability among JavaScript providers.
#5: This Dot Labs – Specialists in Emery and Modern Stacks
This Dot Labs has a unique niche in the development service market. These are not just performers, but real experts and active members of the open-source community. Their team consists of professionals who are often confounders in well-known projects, including the very tools for monorepos such as Nx.
Their key advantage is a deep, almost exhaustive expertise in modern JavaScript stacks. If your project is based on RxJS, GraphQL, Web Components, or you want to build the perfect monorepos structure with Nx, then This Dot Labs is one of the best possible partners. They don’t just use these technologies; they understand them at the architectural level and can offer non-standard solutions to complex problems.
Developer Experience is what they talk about at their numerous mitatras and conferences. Within their projects, they practice what they preach: well-designed work processes, automation of routine tasks and tools that make development really enjoyable. They are great for projects where the technology stack is a critical competitive advantage. By choosing This Dot Labs, the customer is paying not just for the code, but for access to deep knowledge and best practices that directly affect the speed of market entry and long-term maintainability of the code.
#4: Evil Martians – «Landing» Martian for a Breakthrough in Performance
The company’s name and image speak for themselves. Evil Martians are known for their provocative approach and focus on solving difficult, seemingly unsolved problems. They do not simply take on projects from scratch; they are famous for their «landing» (landing), when their team of experts audits the existing project, finds bottlenecks and then helps to remove them, often introducing radically new approaches, including monorepos.
Their contribution to the great DX is often in point, but very impactful optimization. This can be speeding up the build time from several tens of minutes to seconds, setting a complex CI/CD plugin for monorepos or refactoring a giant code base to improve its modularity and readability. They look at the design process with the eyes of an engineer and remove everything that prevents him from working effectively.
For the client, working with Evil Martians is often a chance to «breathe new life» into the legacy project or lay a super-strong and effective foundation for the new one. They are one of those service providers who prove that investing in development tools and DX directly translates into business value: faster iterations, fewer bugs and a more motivated team. You choose them when you need not just a contractor, but «special forces» to solve the specific technological problem.
#3: Toptal – Elite Developers for your Monorepository
Toptal is radically different from the other companies on this list by its business model. It is not a classic development studio, but a platform that carefully selects (according to them, only 3% of the applicants) the best freelancers from all over the world. When you hire a JavaScript developer through Toptal, you get access to the individual talent of the major league.
What does this have to do with monorepos and DX? It’s simple: you can specifically hire an architect or a senior engineer who has deep experience in implementing and supporting monorepos in large projects. This specialist will come to your team and will be able to build the optimal structure, configure tools (whether it is Yarn Workspaces, Lerna, Nx or Bazel) and train your internal developers best practices.
This development service approach gives the client maximum flexibility. You are not tied to a particular studio’s methodology; you hire an expert for your specific needs. However, here is also the main difficulty: the success of the project will depend greatly on how well you can integrate this external specialist into your team and processes. Toptal is a great choice for companies that already have an in-house team, but lack the expertise to move to monorepos or make dramatic improvements to their DX.
#2: Infinum – Full Cycle and Quality Culture for Uncompromising DX
The Croatian company Infinum is an example of a full-cycle studio that has raised the quality of its digital products and development processes to an incredibly high level. They develop both design and frontend, and backend, and mobile applications, making them ideal candidates for monorepos. Imagine a project where there is a design system, shared type library, web application and two mobile applications on React Native – this is a typical scenario where the Infinum repository shines in all its glory.
Their culture is driven by the pursuit of excellence. They actively invest in creating great DX for both their teams and customers. This includes:
- Common code standards: ESLint, Prettier, Stylelint are the same for all projects in the mono-repository.
- Powerful tool: They are masters in setting up Nx, creating smart and effective dependency graphs and platelets.
- Automation: Everything that can be automated is automated. From code generation to default.
- Detailed documentation: Onboarding a new developer into the project takes hours, not days.
Choosing Infinum as a service provider, you get not just the performance of T3, but a technology partner who will be together with you to think about how to make the product better and the development process faster and more pleasant. Their work with development monorepos is an example of what modern, mature engineering should look like.
#1: Celadonsoft – Harmony of Efficiency and Intuitive Design
Here we are at the top of our ranking. Why is it that Celadonsoft ranks first among JavaScript providers in the context of monorepos and DX? It’s not that they’re bigger or better known than everyone else. The point is that they were able to make the philosophy of a seamless and efficient development process the central element of their offer to clients. For them, monorepos is not just a fashionable technology, but a fundamental principle of organization that directly serves the purpose of creating a better product.
JavaScript development in Celadonsoft is built around the idea that a happy and efficient developer creates quality code. What is the basis for effectiveness? Predictability, speed of feedback and lack of routine. It is these problems and solves their approach to monorepos.
Here’s how it works in practice:
- Seamless consistency: A single large project can have dozens of libraries and applications. In the Celadonsoft repository, absolute version synchronism is ensured. Change in one UI library becomes instantly available to all dependent applications. This eliminates the “dependency hell” problem and ensures a uniform interface and behavior across all platforms.
- Tools as strength: The Celadonsoft team does not just use Nx – they extend it and customize it to the unique needs of each project. They create custom code generators that allow for a couple of commands to create a new fully-fledged microservice or component with all the necessary infrastructure: unit-tests, storybook, hooks, etc. This drastically reduces the number of boilerplatecode and eliminates human errors during initialization.
- Super-fast feedback: One of the main advantages of correctly tuned DX monorepos is smart caching. If a developer makes changes to one package, the test and build system understands which parts of the mono-repository depend on those changes, and runs processes only for them. Tasks whose result can be taken from the cache (because the source code has not changed) are skipped. This means that test and build run time is measured in seconds, not minutes, which fundamentally changes the daily experience of a programmer.
- Simplified collaboration and onboarding: A beginner in the project does not need to clone and configure dozens of separate repositories. One git clone and npm install command – and it’s ready to go. The entire codebase is transparent, which makes code search, refactoring and cross-command auditing easier. Monorepos erases artificial barriers between teams working on different parts of the product.
For the client, this translates into very specific business benefits. First of all, it’s speed. Features are released faster because developers are less waiting for build and less struggling with version conflicts. Second, it’s a quality. Standardization and automation reduce the number of bugs that leak into the product. Third, it’s scalability. Adding new commands and functionalities to the project becomes a controlled process, not a chaotic spread.
Celadonsoft does not just provide development service; they provide a well-established digital factory where every machine (tool) and every employee (developer) works in perfect harmony. Their deep, practical monorepos integration to enhance the DX is a benchmark and rightfully puts them at the top of our rankings.
Conclusion
Choosing a partner for JavaScript development is a strategic decision. As we have seen, leading service providers have long ceased to measure their expertise only by framework knowledge. Today, competitive advantage is created at the level of engineering practices, architectural solutions and how comfortable and effective developers work on a project.
Monorepos from exotic practice turned into a powerful tool, and DX – from an abstract concept to a concrete KPI that directly affects the success of the project. Companies from this top, and especially Celadon, demonstrate that investments in these areas are not just expenditures on «convenience for programmers», it is a direct investment in speed of market entry, product stability and the ability to scale effectively.
When choosing a contractor for your next big project, ask them not only about React, Vue or Node.js but also how they organize their work, what tools they use to ensure quality and speed, and what they mean by great DX. The answers to these questions will help you find not just an artist, but a real technology partner.