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Hire JavaScript Developers

Build innovative web apps faster and improve performance with expert JavaScript developer

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Solutions to Your Hiring Challenges


Cross-Browser Compatibility

We ensure seamless UI experiences across browsers by leveraging web standards, feature detection, and progressive enhancement for broad device/browser support.


Asynchronous Programming

Our developers build snappy and concurrent apps with asynchronous JavaScript techniques like callbacks, promises, and async/await for improved latency and performance.


Performance Optimization

We boost frontend efficiency through optimized algorithms, tree shaking, caching strategies, lazy loading, and other innovative performance enhancements.

Our JavaScript Developer Hiring Process

Technical Screening Call
CV & Code Challenge
Paid Test Task (Optional)
Client Interviews
1 / 5

We schedule introductory calls to evaluate candidates' expertise across core JavaScript principles, frameworks, capabilities, and communication skills.

2 / 5

Developers complete a code challenge representative of real-world requirements to demonstrate their skills in asynchronous programming, DOM manipulation, and state management.

3 / 5

When applying for advanced roles, candidates will complete pilot assignments to verify compliance with code standards and delivery expectations.

4 / 5

Clients interview screened developers to evaluate communication abilities, comprehension of business objectives, cultural fit, and vision for web solutions.

5 / 5

Once selected, JavaScript developers undergo joint onboarding covering accounts, tools, role clarity, team integration, frameworks, and project alignment.

What do our customers say about us?

Colin Millward
2 people 1 year
Colin Millward
Colin Millward
COO of ResoX, Singapor

“We engaged SpdLoad to develop and deploy a central business solution. It was the right decision. It was a pleasure to work with the team on all levels!”

Anas Nakawa
2 people 1 year
Anas Nakawa
Anas Nakawa
Co-founder, CTO of ShortPoint, UAE

“SpdLoad has provided us with an excellent set of engineers who could work on complex problems and provide scalable solutions that will last us for years.”

Gabriel Senftle
10 people 1 year
Gabriel Senftle
Gabriel Senftle
Founder of Studicon, Germany

“Firstly, they’re very proactive in working on custom software development. Secondly, they are transparent about the processes and costs. Thirdly, their designers are amazing.”

Omar Agely
10 people 3 years
Omar Agely
Omar Agely
Product owner of Rearden House, UAE

“From the first meeting, we realized that we would cooperate. I’ve worked with a custom software development agency for ten years, and the SpdLoad team is one of the greatest.”

Len Marchese
8 people 3 years
Len Marchese
Len Marchese
Founder of PCS, USA

“We brought them on to implement two startups. Their skills and professionalism are outstanding. I appreciate that they are engaged and communicative, but most of all, there is no distance between us, even though I am in Chicago and the team is in Ukraine.”

Johannes Ehrhardt
5 people 1 year
Johannes Ehrhardt
Johannes Ehrhardt
Co-founder of Blue Academy, Germany

“The people at SpdLoad are highly effective and easy to collaborate with. I am satisfied with their work. They helped us to develop our MVP in six months in a complex and stressful situation.”

Danny Djanogly
4 people 2 years
Danny Djanogly
Danny Djanogly
CMO of Dogiz , Israel

“SpdLoad developed the CRM dashboard of the B2B2C marketplace using ReactJS. The team has significantly expanded its functionality, so we also decided to collaborate on other projects.”

Edward Sapp
3 people 3 years
Edward Sapp
Edward Sapp
CEO of DemographIQ, USA

“After having a great experience, I plan to use SpdLoad for all future projects, subject to their availability.”

Sanoma Jean
11 people 2 years
Sanoma Jean
Sanoma Jean
Co-Founder of Ayatherapy, USA

“Throughout the entire process, they were great partners. Working with them was enjoyable, and we were impressed by their professionalism and output during a time of great uncertainty in their home country.”

33 Reviews
Our average customer cooperation
exceeds two years, as verified by
independent review platforms.
100% job success
Impressive customer satisfaction rates,
ranging from 90% to 100% according to the
rigorous algorithms of Upwork.

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    Frequently Asked Questions

    Can your developers build progressive web apps?

    Our dedicated JavaScript teams are highly experienced with developing progressive web apps (PWA) using modern APIs such as service workers, manifests, and cache to enable faster loading, offline usage, and app-like experiences.

    What JavaScript frameworks do you use?

    Our JavaScript developers use popular frameworks like React, Angular, and Vue to build complex and interactive UI components. We manage state and routing while ensuring high performance through virtual DOM diffing algorithms and simplified templating.

    How do you optimize frontend performance?

    We employ various performance optimizations like code splitting to lazy load non-critical resources, tree shaking to eliminate unused code, caching assets on CDNs, and enabling GPU-accelerated CSS and JavaScript minimization to boost page load speeds significantly.

    Can your developers integrate with various APIs and databases?

    Our JavaScript programmers are proficient in using third-party APIs for payment gateways, chatbots, and maps, as well as REST and GraphQL APIs with Axios and Apollo Client for data integration.

    Do you guarantee cross-browser compatibility?

    We have experience with cross-browser testing for consistent UI rendering and behavior across modern and legacy browsers.