JavaScript Developers for Hire
Four Ages enables you to hire JavaScript developers who can bring technical depth and a strategic mindset and ensure the long-term success of your solution. From cutting-edge front-end interfaces to resilient back-end architectures, we leverage modern frameworks to build every layer of your software. Thus, we design it for optimal performance, sustainable growth, and long-term impact.
JavaScript Developers for Hire
Four Ages enables you to hire JavaScript developers who can bring technical depth and a strategic mindset and ensure the long-term success of your solution. From cutting-edge front-end interfaces to resilient back-end architectures, we leverage modern frameworks to build every layer of your software. Thus, we design it for optimal performance, sustainable growth, and long-term impact.
JavaScript Developers for Hire
Four Ages enables you to hire JavaScript developers who can bring technical depth and a strategic mindset and ensure the long-term success of your solution. From cutting-edge front-end interfaces to resilient back-end architectures, we leverage modern frameworks to build every layer of your software. Thus, we design it for optimal performance, sustainable growth, and long-term impact.
Why Hire JS Developers at Four Ages
The experience of our JS developers allows us to transform any ambitious vision into a complete product.
15+ consecutive years in JS & software development
15+ consecutive years in JS & software development
15+ consecutive years in JS & software development
The ability to build your project from the ground up
The ability to build your project from the ground up
The ability to build your project from the ground up
85% of senior-level developers
85% of senior-level developers
85% of senior-level developers
Quick start and easy cooperation
Quick start and easy cooperation
Quick start and easy cooperation
Proven expertise across 30+ industries
Proven expertise across 30+ industries
Proven expertise across 30+ industries
JavaScript consultants with an average of 8+ years of hands-on mastery
JavaScript consultants with an average of 8+ years of hands-on mastery
JavaScript consultants with an average of 8+ years of hands-on mastery
Hire a JavaScript Expert for Your Business Needs
With extensive experience and up-to-date knowledge of the latest technologies, Four Ages is well-equipped to develop applications of varying scale and complexity, thereby meeting diverse business objectives.
Software Types
Web applications
XaaS/SaaS
Cloud apps
Mobile apps
Custom APIs
Software Types
Web applications
XaaS/SaaS
Cloud apps
Mobile apps
Custom APIs
Software Types
Web applications
XaaS/SaaS
Cloud apps
Mobile apps
Custom APIs
Software Complexity
Enterprise-level projects
Solutions built with extensive system integrations
Microservices-based architectures
Serverless solutions
MVPs
Software Complexity
Enterprise-level projects
Solutions built with extensive system integrations
Microservices-based architectures
Serverless solutions
MVPs
Software Complexity
Enterprise-level projects
Solutions built with extensive system integrations
Microservices-based architectures
Serverless solutions
MVPs
Software Purposes
Company-targeted software
Commercial products
Software Purposes
Company-targeted software
Commercial products
Software Purposes
Company-targeted software
Commercial products
Technical Skills of Our JavaScript Developers for Hire
Four Ages always relies on senior-level experts to navigate the stages of our rigorous hiring process.
JavaScript Frameworks
JavaScript Frameworks
JavaScript Frameworks
Angular
Angular
Angular
React
React
React
Vue.js
Vue.js
Vue.js
Ember
Ember
Ember
Next.js
Next.js
Next.js
Node.js-Oriented Frameworks
Node.js-Oriented Frameworks
Node.js-Oriented Frameworks
Express
Express
Express
Koa
Koa
Koa
Nest
Nest
Nest
Sails
Sails
Sails
Meteor
Meteor
Meteor
Hapi
Hapi
Hapi
LoopBack
LoopBack
LoopBack
Restify
Restify
Restify
Passport
Passport
Passport
Build & Productivity Tools
Build & Productivity Tools
Build & Productivity Tools
ESLint
ESLint
ESLint
Webpack
Webpack
Webpack
Axios
Axios
Axios
Grunt
Grunt
Grunt
Gulp
Gulp
Gulp
Postman
Postman
Postman
UI & Preprocessors
UI & Preprocessors
UI & Preprocessors
SCSS
SCSS
SCSS
Less.js
Less.js
Less.js
Mobile
Mobile
Mobile
Ionic
Ionic
Ionic
React Native
React Native
React Native
Cordova
Cordova
Cordova
Cloud Platforms
Cloud Platforms
Cloud Platforms
AWS
AWS
AWS
Rackspace
Rackspace
Rackspace
DigitalOcean
DigitalOcean
DigitalOcean
Microsoft Azure
Microsoft Azure
Microsoft Azure
Google Cloud
Google Cloud
Google Cloud
Quality Assurance
Quality Assurance
Quality Assurance
Jest
Jest
Jest
Jasmine
Jasmine
Jasmine
MOQ
MOQ
MOQ
Specflow
Specflow
Specflow
Sinon.js
Sinon.js
Sinon.js
Katalon
Katalon
Katalon
Chai
Chai
Chai
Mocha
Mocha
Mocha
Cypress
Cypress
Cypress
Playwright
Playwright
Playwright
DevOps & CI/CD
DevOps & CI/CD
DevOps & CI/CD
Jenkins
Jenkins
Jenkins
Ansible
Ansible
Ansible
Docker
Docker
Docker
Pulumi
Pulumi
Pulumi
Kubernetes
Kubernetes
Kubernetes
Azure DevOps
Azure DevOps
Azure DevOps
Terraform
Terraform
Terraform
JavaScript Developers for Hire: Choose Your Cooperation Model
For your flexibility, we developed three versatile models to hire JavaScript consultants at Four Ages.
Product Development
If you choose to collaborate according to this model, we will take full responsibility for software consulting and development — from initial architecture planning to solution design and strategic guidance. We can coordinate the end-to-end process on our side with a certified project manager, or you can manage the team directly — whichever suits your organization best. This model is also a strong fit if you don’t have a technical CTO but have clear business goals or need to address sudden spikes in software development demand. In such cases, we offer fractional CTO services, bringing in a software architect and a UI/UX expert to help shape the solution from the ground up. Once the vision is defined, we choose from our pool of candidates or hire JS coders to support execution, alignment, and implementation strategy.
Product Development
If you choose to collaborate according to this model, we will take full responsibility for software consulting and development — from initial architecture planning to solution design and strategic guidance. We can coordinate the end-to-end process on our side with a certified project manager, or you can manage the team directly — whichever suits your organization best. This model is also a strong fit if you don’t have a technical CTO but have clear business goals or need to address sudden spikes in software development demand. In such cases, we offer fractional CTO services, bringing in a software architect and a UI/UX expert to help shape the solution from the ground up. Once the vision is defined, we choose from our pool of candidates or hire JS coders to support execution, alignment, and implementation strategy.
Product Development
If you choose to collaborate according to this model, we will take full responsibility for software consulting and development — from initial architecture planning to solution design and strategic guidance. We can coordinate the end-to-end process on our side with a certified project manager, or you can manage the team directly — whichever suits your organization best. This model is also a strong fit if you don’t have a technical CTO but have clear business goals or need to address sudden spikes in software development demand. In such cases, we offer fractional CTO services, bringing in a software architect and a UI/UX expert to help shape the solution from the ground up. Once the vision is defined, we choose from our pool of candidates or hire JS coders to support execution, alignment, and implementation strategy.
Staff Augmentation
With this cooperation model for software consulting, we assemble teams of experts led by certified project managers. When selecting specialists for your project, we carefully vet candidates based on their background in similar or adjacent industries to ensure domain relevance. As skilled software development consultants, we ensure that each team member brings valuable insights and strategic expertise to support high-impact outcomes. Once a dedicated team is complete and starts working on your solution, you’ll receive regular updates on project direction and resource allocation. Our project manager will provide weekly (or as agreed) reports covering milestones reached, current budget usage, and other key information to keep you fully informed.
Staff Augmentation
With this cooperation model for software consulting, we assemble teams of experts led by certified project managers. When selecting specialists for your project, we carefully vet candidates based on their background in similar or adjacent industries to ensure domain relevance. As skilled software development consultants, we ensure that each team member brings valuable insights and strategic expertise to support high-impact outcomes. Once a dedicated team is complete and starts working on your solution, you’ll receive regular updates on project direction and resource allocation. Our project manager will provide weekly (or as agreed) reports covering milestones reached, current budget usage, and other key information to keep you fully informed.
Staff Augmentation
With this cooperation model for software consulting, we assemble teams of experts led by certified project managers. When selecting specialists for your project, we carefully vet candidates based on their background in similar or adjacent industries to ensure domain relevance. As skilled software development consultants, we ensure that each team member brings valuable insights and strategic expertise to support high-impact outcomes. Once a dedicated team is complete and starts working on your solution, you’ll receive regular updates on project direction and resource allocation. Our project manager will provide weekly (or as agreed) reports covering milestones reached, current budget usage, and other key information to keep you fully informed.
Team Extension
This collaboration framework acts as a seamless extension of your existing developer team. The best-fitting candidates from our side join your engineers remotely, offering specialized support without the overhead of in-house hiring. Custom software development consulting can be conducted with this model when you need to hire a JavaScript programmer with additional expertise to accelerate project delivery, meet tight deadlines, or reduce time to market. It’s equally effective when you require specialized talent for a specific phase of your project, without committing to long-term, full-time hires.
Team Extension
This collaboration framework acts as a seamless extension of your existing developer team. The best-fitting candidates from our side join your engineers remotely, offering specialized support without the overhead of in-house hiring. Custom software development consulting can be conducted with this model when you need to hire a JavaScript programmer with additional expertise to accelerate project delivery, meet tight deadlines, or reduce time to market. It’s equally effective when you require specialized talent for a specific phase of your project, without committing to long-term, full-time hires.
Team Extension
This collaboration framework acts as a seamless extension of your existing developer team. The best-fitting candidates from our side join your engineers remotely, offering specialized support without the overhead of in-house hiring. Custom software development consulting can be conducted with this model when you need to hire a JavaScript programmer with additional expertise to accelerate project delivery, meet tight deadlines, or reduce time to market. It’s equally effective when you require specialized talent for a specific phase of your project, without committing to long-term, full-time hires.
How Do Our JavaScript Consultants Guarantee Code Quality
Our JavaScript consultants follow proven practices to ensure code that’s clean, secure, and built to last.
Best Practices of Coding
When you hire a JavaScript developer at Four Ages, you get to work with a professional who strictly adheres to established coding standards and utilizes quality tools like ESLint. Our experts also follow the established data security practices to protect sensitive information and prevent vulnerabilities.
Another rule they stick to is keeping proper documentation of both code and dependencies. It enables easy collaboration and facilitates future updates.
Finally, at Four Ages, you can hire dedicated JavaScript developers who ensure cross-platform portability, automation, and standardization to minimize errors and improve productivity.
Best Practices of Coding
When you hire a JavaScript developer at Four Ages, you get to work with a professional who strictly adheres to established coding standards and utilizes quality tools like ESLint. Our experts also follow the established data security practices to protect sensitive information and prevent vulnerabilities.
Another rule they stick to is keeping proper documentation of both code and dependencies. It enables easy collaboration and facilitates future updates.
Finally, at Four Ages, you can hire dedicated JavaScript developers who ensure cross-platform portability, automation, and standardization to minimize errors and improve productivity.
Best Practices of Coding
When you hire a JavaScript developer at Four Ages, you get to work with a professional who strictly adheres to established coding standards and utilizes quality tools like ESLint. Our experts also follow the established data security practices to protect sensitive information and prevent vulnerabilities.
Another rule they stick to is keeping proper documentation of both code and dependencies. It enables easy collaboration and facilitates future updates.
Finally, at Four Ages, you can hire dedicated JavaScript developers who ensure cross-platform portability, automation, and standardization to minimize errors and improve productivity.
Unit Testing
To verify how the code handles standard, boundary, and invalid inputs, our professionals run comprehensive unit tests. It helps them identify possible issues at an early stage of the development process. They also conduct tests following each significant modification. As a result, they ensure that it functions properly and maintain a clear and understandable codebase.
Unit Testing
To verify how the code handles standard, boundary, and invalid inputs, our professionals run comprehensive unit tests. It helps them identify possible issues at an early stage of the development process. They also conduct tests following each significant modification. As a result, they ensure that it functions properly and maintain a clear and understandable codebase.
Unit Testing
To verify how the code handles standard, boundary, and invalid inputs, our professionals run comprehensive unit tests. It helps them identify possible issues at an early stage of the development process. They also conduct tests following each significant modification. As a result, they ensure that it functions properly and maintain a clear and understandable codebase.
Code Review Practices
JavaScript consulting with Four Ages includes conducting regular and consecutive code review sessions. Based on the project requirements and scale, we choose and stick to the best-fitting approach:
Peer review involves developers systematically reviewing each other’s code, often via pull requests.
Code inspection is the most formal. It follows a defined checklist and roles (moderator, author, reviewers). This type guarantees that the code matches the top expectation and adheres to all standards before merging.
Code Review Practices
JavaScript consulting with Four Ages includes conducting regular and consecutive code review sessions. Based on the project requirements and scale, we choose and stick to the best-fitting approach:
Peer review involves developers systematically reviewing each other’s code, often via pull requests.
Code inspection is the most formal. It follows a defined checklist and roles (moderator, author, reviewers). This type guarantees that the code matches the top expectation and adheres to all standards before merging.
Code Review Practices
JavaScript consulting with Four Ages includes conducting regular and consecutive code review sessions. Based on the project requirements and scale, we choose and stick to the best-fitting approach:
Peer review involves developers systematically reviewing each other’s code, often via pull requests.
Code inspection is the most formal. It follows a defined checklist and roles (moderator, author, reviewers). This type guarantees that the code matches the top expectation and adheres to all standards before merging.
Code Quality Metrics
We ensure measurable code quality by tracking key metrics.
We track Maintainability Index (MI) and Cyclomatic Complexity (CC) to ensure clean, adaptable code. MI demonstrates how easily the code can be extended and maintained. CC reflects the number of logic paths — lower complexity means simpler testing and fewer potential errors.
Depth of Inheritance shows a class depth within the inheritance hierarchy. With us, you hire JavaScript consultants who keep hierarchies simple to improve flexibility.
Class Coupling measures interdependencies between classes. Low coupling is preferred as it improves modularity, testability, and scalability.
Code Quality Metrics
We ensure measurable code quality by tracking key metrics.
We track Maintainability Index (MI) and Cyclomatic Complexity (CC) to ensure clean, adaptable code. MI demonstrates how easily the code can be extended and maintained. CC reflects the number of logic paths — lower complexity means simpler testing and fewer potential errors.
Depth of Inheritance shows a class depth within the inheritance hierarchy. With us, you hire JavaScript consultants who keep hierarchies simple to improve flexibility.
Class Coupling measures interdependencies between classes. Low coupling is preferred as it improves modularity, testability, and scalability.
Code Quality Metrics
We ensure measurable code quality by tracking key metrics.
We track Maintainability Index (MI) and Cyclomatic Complexity (CC) to ensure clean, adaptable code. MI demonstrates how easily the code can be extended and maintained. CC reflects the number of logic paths — lower complexity means simpler testing and fewer potential errors.
Depth of Inheritance shows a class depth within the inheritance hierarchy. With us, you hire JavaScript consultants who keep hierarchies simple to improve flexibility.
Class Coupling measures interdependencies between classes. Low coupling is preferred as it improves modularity, testability, and scalability.
Hire a JavaScript engineer: The Pillars of Our Cooperation
At Four Ages, we place equal importance on the end product and the development process. As a result, we aim to ground our collaboration on several transparent principles.
Project reporting — we commit to providing regular updates on your project. Based on specific requirements, we offer several reporting types and models.
Project reporting — we commit to providing regular updates on your project. Based on specific requirements, we offer several reporting types and models.
Project reporting — we commit to providing regular updates on your project. Based on specific requirements, we offer several reporting types and models.
Security management — our team enforces secure coding practices from day one and implements security-focused code reviews.
Security management — our team enforces secure coding practices from day one and implements security-focused code reviews.
Security management — our team enforces secure coding practices from day one and implements security-focused code reviews.
Measured success — keeping track of crucial indicators like the software quality, timing, and budget lets us see how well the solution meets targets.
Measured success — keeping track of crucial indicators like the software quality, timing, and budget lets us see how well the solution meets targets.
Measured success — keeping track of crucial indicators like the software quality, timing, and budget lets us see how well the solution meets targets.
Knowledge management — we actively promote knowledge management and sharing. Thus, we conduct frequent knowledge-sharing sessions, keep internal wikis up to date, and document important project insights.
Knowledge management — we actively promote knowledge management and sharing. Thus, we conduct frequent knowledge-sharing sessions, keep internal wikis up to date, and document important project insights.
Knowledge management — we actively promote knowledge management and sharing. Thus, we conduct frequent knowledge-sharing sessions, keep internal wikis up to date, and document important project insights.
Change planning — we acknowledge that priorities and objectives can change during the development process. That’s why we remain flexible to target any changes effectively.
Change planning — we acknowledge that priorities and objectives can change during the development process. That’s why we remain flexible to target any changes effectively.
Change planning — we acknowledge that priorities and objectives can change during the development process. That’s why we remain flexible to target any changes effectively.
Risk management — we proactively monitor potential risks and develop risk management plans to utilize in case of unexpected events.
Risk management — we proactively monitor potential risks and develop risk management plans to utilize in case of unexpected events.
Risk management — we proactively monitor potential risks and develop risk management plans to utilize in case of unexpected events.
Contacts
Need a Consultation?
Get in touch
Contact us
London
124 City Road, London, United Kingdom, EC1V 2NX
Cordoba
San Lorenzo 25, Cordoba, Argentina X5000AZA
Warsaw
Grzybowska 60, Warsaw, Poland, 00-844
Kyiv
Dorohozhytska St, 3, Kyiv, Ukraine, 02000
Lviv
Zamknena St, 9, Lviv, Ukraine, 79000
Contacts
Need a Consultation?
Get in touch
Contact us
London
124 City Road, London, United Kingdom, EC1V 2NX
Cordoba
San Lorenzo 25, Cordoba, Argentina X5000AZA
Warsaw
Grzybowska 60, Warsaw, Poland, 00-844
Kyiv
Dorohozhytska St, 3, Kyiv, Ukraine, 02000
Lviv
Zamknena St, 9, Lviv, Ukraine, 79000
Contacts
Need a Consultation?
Get in touch
Contact us
London
124 City Road, London, United Kingdom, EC1V 2NX
Cordoba
San Lorenzo 25, Cordoba, Argentina X5000AZA
Warsaw
Grzybowska 60, Warsaw, Poland, 00-844
Kyiv
Dorohozhytska St, 3, Kyiv, Ukraine, 02000
Lviv
Zamknena St, 9, Lviv, Ukraine, 79000
Software Development
Database creation and management
Services
Solutions
Human resources
Enterprise content management
ERP
Business automation services
Services
Financial management
Data analytics
Asset management
Document management
Services
Fleet management
Marketing and advertising
Kiosk software
Webportals
Services
Media & entertainment
Multimedia
IT
E-Commerce
Software Development
Database creation and management
Services
Solutions
Human resources
Enterprise content management
ERP
Business automation services
Financial management
Data analytics
Asset management
Document management
Fleet management
Marketing and advertising
Kiosk software
Webportals
Media & entertainment
Multimedia
IT
E-Commerce
Software Development
Database creation and management
Solutions
Human resources
Enterprise content management
ERP
Business automation services
Financial management
Data analytics
Asset management
Document management
Fleet management
Marketing and advertising
Kiosk software
Webportals
Media & entertainment
Multimedia
IT
E-Commerce