JavaScript Development Company

You bring the vision — we bring 200+ JS projects’ expertise and <10% CPI/SPI variance. Let’s build with confidence.
  • badge.name
    Top Software Development Company, 2025
  • badge.name
    Listed Among Top 1000 Companies Globally
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    Top Software Development Company for Small Businesses
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    Top Software Development Company in Ukraine for Startups

01 | 03

Fortune #40 Global Health Leader

1886-founded, 131K employees, $16B in R&D

NYSE: EB

850k creators, 300M tickets sold in 2023

8th GPS App in the US

3M+ in 2023, 10M+ Google Play downloads

Cultural Exchange Led by 2K+ Team

Est. 1980, 500K+ Alumni, 100+ Countries

$12M Revenue Tech Co.

MBE Certified by NMSDC

Trusted Logistics Co. Since 1979

ISO9001 Certified Systems Integrator

3rd in Retail Inc. 5000

$6M+ raised, #1 ranked company in CT

UCSF-Trusted Health App

with 50K+ users in 60+ countries

Google-Funded Green Tech

144K Ha Monitored, Featured by Reuters

Telecom Experts Est. 2005

Google, Proximus & Orange partners

NASA-Trusted Workflows Builder

Est. in 2007; PCI, GDPR & HIPAA certified

Top Swiss Agency

Awarded #1 Swiss App in 2025

#2 SMM Agency in Australia

Serves 1k+ Australian B2B across 20+ domains

Google Cloud Partner

Trusted by Fortune 5 UHG

F&B Startup with 25K+ Guests/Y

4.5 on TripAdvisor, 600+ Dining Partners

Fortune #40 Global Health Leader

1886-founded, 131K employees, $16B in R&D

NYSE: EB

850k creators, 300M tickets sold in 2023

8th GPS App in the US

3M+ in 2023, 10M+ Google Play downloads

Cultural Exchange Led by 2K+ Team

Est. 1980, 500K+ Alumni, 100+ Countries

$12M Revenue Tech Co.

MBE Certified by NMSDC

Trusted Logistics Co. Since 1979

ISO9001 Certified Systems Integrator

F&B Startup with 25K+ Guests/Y

4.5 on TripAdvisor, 600+ Dining Partners

Google Cloud Partner

Trusted by Fortune 5 UHG

#2 SMM Agency in Australia

Serves 1k+ Australian B2B across 20+ domains

Top Swiss Agency

Awarded #1 Swiss App in 2025

NASA-Trusted Workflows Builder

Est. in 2007; PCI, GDPR & HIPAA certified

Telecom Experts Est. 2005

Google, Proximus & Orange partners

Google-Funded Green Tech

144K Ha Monitored, Featured by Reuters

UCSF-Trusted Health App

with 50K+ users in 60+ countries

3rd in Retail Inc. 5000

$6M+ raised, #1 ranked company in CT

Trusted Logistics Co. Since 1979

ISO9001 Certified Systems Integrator

$12M Revenue Tech Co.

MBE Certified by NMSDC

Cultural Exchange Led by 2K+ Team

Est. 1980, 500K+ Alumni, 100+ Countries

8th GPS App in the US

3M+ in 2023, 10M+ Google Play downloads

NYSE: EB

850k creators, 300M tickets sold in 2023

Fortune #40 Global Health Leader

1886-founded, 131K employees, $16B in R&D

F&B Startup with 25K+ Guests/Y

4.5 on TripAdvisor, 600+ Dining Partners

Google Cloud Partner

Trusted by Fortune 5 UHG

#2 SMM Agency in Australia

Serves 1k+ Australian B2B across 20+ domains

Top Swiss Agency

Awarded #1 Swiss App in 2025

NASA-Trusted Workflows Builder

Est. in 2007; PCI, GDPR & HIPAA certified

Telecom Experts Est. 2005

Google, Proximus & Orange partners

Use cases

01 | 10
01 | 10

Testimonials

01 | 03
01 | 06

Cooperation models just for your case

Product development

Dedicated JS team

Staff augmentation

Full-stack JS product development

We handle the full cycle — from discovery to frontend, backend, testing, and delivery — with project management on our side. You stay in control with clear updates at every stage and full access to project documentation, code, and other deliverables. Best if you want to build a product without managing developers directly.

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product development

How we develop JS products

From first idea to launch — and everything after. These six steps shape the core of our JS development services.

1. Discovery: From raw idea to structured product scope

We begin by gaining a clear understanding of your product goals, user needs, and technical context. Together, we define the scope, key features, and constraints that shape your JavaScript app, from UI to backend logic. You get a documented plan, timeline, and estimates. Our project manager leads communication, ensuring that questions are answered promptly and that all insights are incorporated directly into design and development planning. Whether you're building from scratch or evolving an MVP, our JavaScript development services help you move from vague concept to actionable strategy.

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2. Design: Building UI and logic around product use cases

We create wireframes, map out flows, and determine interface visuals, prioritizing usability, performance, and your preferences. Plus, design isn’t just about screens: we also define how components behave and interact, so it’s ready for JS implementation. Our team shares progress via Figma and syncs regularly to align on feedback. Nothing moves forward until it’s approved and fully understood by both parties.

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3. Development: Clean code, reliable velocity

We develop your product using modern JavaScript stacks — React, Angular, or Vue for frontend, Node.js, and Express.js for backend — applying proven patterns and clean architecture. Tasks are planned in sprints, reviewed by senior devs, and tracked in your project board. You get regular updates, live demos, and clear metrics on what’s been done and what’s next. Our PM leads delivery, handles planning and resourcing, so development stays fast, focused, and calm. As a JavaScript development company, we bring experience and process maturity to help you launch efficiently without cutting corners.

4. Testing: QA built into every sprint

Testing begins early and runs in parallel with development. We cover everything from functional checks to edge cases, using manual testing, automated scripts, and real-device checks where needed. Our QA team works directly with developers and project managers — bugs are added straight to the sprint board. You get visibility into reported issues and how we handle them. The result: fewer bugs, faster releases, and no stress at launch.

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5. Deployment: From staging to live without chaos

Deployment isn’t a rushed handoff — we approach it as a planned, controlled release. We configure environments, set up CI/CD, run pre-launch QA, and monitor stability post-release. You get full visibility: what’s being deployed, when, and what to expect next. Whether it’s a soft launch or a major rollout, we ensure your JavaScript product goes live without issues.

6. Growth: Your product’s next phase, fully supported

After release, if you plan to move development in-house, we make the transition smooth: sharing documentation, transferring knowledge, and supporting your new team. If you'd like us to stay on, we're ready to continue as your product team — adding features, improving performance, and helping you scale. That’s where working with a reliable JavaScript web development company pays off — we stay accountable as your product grows and evolves.

No-surprise JavaScript development

Staying on schedule

Sticking to budget

Clear transparency

Managing risks proactively

Planned, tracked, and delivered on time

We plan JavaScript project timelines based on real capacity. Using SPI (Schedule Performance Index), weekly scope checks, and early risk flagging, we maintain a schedule variance of under 10%. You get a clear roadmap, sprint-based delivery, and regular progress updates. And what if priorities shift? We align quickly, discuss options with you, and adjust the plan.

timeline commitment

What sets us apart?

    • Only 1% of candidates pass our hiring funnel, so you work with proven talent.
  • 10+ years in JavaScript means you get deep expertise from day one.
  • We combine PMI standards with flexibility to maintain sharp and focused delivery.
  • Clear communication with a personalized plan and regular updates.
  • You get full access to boards, code, and docs — nothing is hidden.

200+

JavaScript products

60+

JS developers

99.89%

acceptance rate

6+ years

of top devs tenure

3.8 years

average tenure

Let’s talk

With 60+ JS devs and 10+ years of delivery, we bring structure, speed, and answers to your product’s most significant development gaps.

  • Response within 24 business hours
  • Receive your estimate in under 10 business days
  • JavaScript team lead involved in estimation
Serhii

Head of Client Relations

Eugene

Account Executive

Clearing up your concerns

What types of JS projects do you typically handle?

We have built JavaScript-based SaaS platforms, marketplaces, CRM systems, task automation tools, and other solutions across a wide range of industries, including MarTech, healthcare, logistics, retail, and real estate.

Most of our work involves dynamic UIs, complex workflows, and tight API integrations — often utilizing React or Vue.js on the frontend and Node.js or Express on the backend.

We also handle modernization projects, migrating legacy applications to a modern JavaScript stack to boost performance and maintainability.

If you're looking for custom JavaScript development services, there's a good chance we’ve already built something similar to what you need.

Do you provide full-stack JavaScript development?

Yes — as a full-stack JavaScript development company, we handle every aspect related to JS. From intuitive frontends built with React, Vue.js, and Angular to scalable backends powered by Node.js or Express.

We take care of everything: database design, API development, performance optimization, and deployment. Regardless of the scale or complexity, we craft cohesive, high-performing solutions utilizing a unified JavaScript ecosystem.

Can you take over a JS project from another team?

Totally. We’ve jumped into numerous in-progress projects and know how to get up to speed quickly. First, we check what’s already there — code, structure, and any blockers — then determine what’s solid and what needs work. From there, we build a plan.

Sometimes it’s a full cleanup. Sometimes it’s just stepping in and keeping a project moving. Either way, we’ve got the skills to take over without missing a beat.

Many clients turn to us when outsourcing JavaScript development becomes the most efficient move to keep things moving forward.

How can I integrate services like payment gateways or APIs?

We’ve got that covered. Need Stripe for payments? Firebase Auth or Google for logins? Email tools, maps, analytics, or any custom API? We’ll plug it in, configure it to meet your needs, and ensure it integrates seamlessly with the rest of your app.

Third-party integrations are part of our daily grind — clean, secure, and built to support whatever your app needs to do.

Will you recommend the best JS stack for my business case?

Definitely. We don’t just throw tech at a problem — we look at the big picture. First, we’ll dig into your goals, product vision, and any technical or business constraints. Then, we’ll recommend the JavaScript stack that makes the most sense for your case, not just what’s trendy.

It could be React with Node.js, REST API, and Firebase, or maybe Vue with a custom API and PostgreSQL. Whatever the combination, our goal is to select tools that support rapid development, future scalability, and tangible business results.

How experienced are your JavaScript developers?

We have been in the industry for over 10 years and have had a dedicated JavaScript development team from the start.

Our developers worked with a full JavaScript stack — frontends with React, Vue, or Angular, and backends built on Node.js and Express. They bring practical experience tackling diverse challenges, from complex data flows to tight third-party integrations.

Our average employee tenure is 3.8 years, way above the industry average. Our developers learn from each other, support one another, and continually sharpen their skills together. 

Through our internal training program, Clockwise University, we mentor new developers from the ground up. Many of them have gone on to become mid-level engineers and tech leads.

How do you ensure high performance in my JS app?

First, we determine what your app needs to handle — users, data, traffic, and the whole deal. Then we build it right from the jump: solid architecture, the right stack, and a setup that won’t fall apart when things scale. 

We maintain clean and modular code, utilize lazy loading, code splitting, and caching, and ensure everything is optimized, from front to back. Regardless of what we’re working with — React, Vue.js, Node.js — we build your app to move quickly and feel slick.

Before launch, we run audits, spot any slowdowns, and fine-tune your app. Fast load times, smooth UX, and a setup that’s ready for growth. Our goal as a JavaScript software development company is to build fast and reliable apps that can withstand pressure.

How is communication handled during development?

We will establish a clear communication plan before writing a single line of code. You tell us how hands-on you want to be, and we match the pace — whether it's a light touch or a deep dive, your choice.

If you want to stay high-level, we’ll handle the day-to-day details and just keep you informed with key updates. Want to be in the loop on every sprint? We’ve got you. Either way, you’ll always have access to the whole picture — task boards, docs, commits, and progress reports, all in real time.

We typically use Slack, Jira, Notion, and GitHub — but if you have a preferred setup, we’re flexible. The goal’s simple: keep you informed, keep the project moving, and never leave you guessing.

Will I have direct access to the developers?

The extent of your interaction depends on the setup and the level of involvement you desire. If you're going with a dedicated team or team extension model, you'll have direct access to the JavaScript devs — they can sync with you or your product manager, and they’re great communicators with solid English. Super easy to work with day-to-day.

If we’re handling the entire product end-to-end, you’ll primarily communicate with your project manager and business analyst, but you’ll also be in the same Slack channel as the development team. A PM will translate your ideas into tasks, oversee project progress, and keep you updated — but if you ever want to hop into a dev convo, we’re all about it. We keep things flexible so you stay comfortable and in control.

How scalable will my application be for future growth?

As scalable as you need it to be. We set up your app with growth in mind — featuring clean architecture, innovative component structure, efficient APIs, and a back-end that’s ready to scale when traffic increases or your feature list expands.

Yeah, it takes a bit more planning upfront. But that saves you serious time (and money) later — no messy rewrites, no last-minute performance fixes, no “why didn’t we think of this earlier?” moments.

We think long-term: how your data will grow, how usage might spike, how new features could impact load. You will get a JavaScript app that grows with your business, not against it.

Do you offer post-launch support for JS products?

Yes. Once your app’s live, we don’t just disappear. We’ll match the level of support to where you’re at. Do you need someone part-time to handle fixes and small updates? We’ve got you. Still in the build mode and adding features? We can keep the entire team involved.

How fast can your team handle urgent support or fixes?

We’re fast during working hours — if something urgent pops up, we’ll jump on it right away, as long as it’s within the response time we agreed on in the contract.

If it’s outside our regular hours, no worries — we’ll set clear expectations upfront so you know exactly what to expect and when. You won’t be left hanging. Your app matters to us, and we’re here to keep your app stable and on track.

How do you estimate costs for JS app development?

We like to keep estimates transparent and realistic. First, we break the project down into clear chunks — every feature, screen, and integration is assigned to a work breakdown structure (WBS). Then, our JavaScript team lead reviews each piece and provides time estimates based on our experience, rather than just hopeful guesses. We also factor in potential risks and edge cases to ensure the numbers hold up, even if things become a bit complicated.

You receive an estimate that accurately reflects the actual effort — a solid foundation for your budget and timeline. That’s our approach to delivering real value through JavaScript development service planning.

What are the typical timeframes for JS app development?

Timelines can vary depending on what you need us to handle: just the frontend, or the full product, including backend, DevOps, and QA. Full-stack projects require more coordination and naturally involve more dependencies to align.

Complexity also plays a role: the more features, custom logic, or intricate UI you have, the more time it takes to build and test properly.

And finally, your monthly budget determines the size of the team we can assign — more hands mean faster delivery. Most of our clients start with a focused MVP, which, with the right scope, can often go live in 4–6 months. We’ll tailor a timeline to your priorities, ensuring steady and meaningful progress without wasting time.

How flexible are you in scaling the JS team up or down?

We adjust quickly. Need more hands or fewer? We scale the team to match your pace. We can quickly bring in more developers, QA engineers, or DevOps specialists. If priorities shift or things slow down, scaling the team back is just as smooth.

We’re not here to lock you into something rigid — the setup can adapt to your pace and goals. Whether you need one solid JavaScript developer or a full-stack team, we match the team size and our JavaScript web development services to your needs.

Key people

person.name
Andrii
Founder & CEO
Clockwiser from Day 1 | Led Clockwise to Top Ukrainian IT Company
person.name
🎤 Karaoke champion
🧠 Quiz monster
🐈 Cat team
person.name
Bogdan
Head of Delivery
10 y. of experience | Set up delivery with 99.88% acceptance rate
person.name
🏂 Snowboarder
💿 DJ
🥁 Drummer
☕ Coffeeholic
person.name
Serhii
Head of Client Relations
11 y. of experience | 98% client satisfaction rate
person.name
🚞 Traveller
Gym rat
☕ Coffeeholic
person.name
Natalia
Head of People
10 y. of experience | 100+ hired talents
person.name
Hyggeist
Wanderlust Soul
🏊‍♀️ Swimmer
🕯️ Detail Aesthete
person.name
Mike
Solution Architect
15 y. of experience | 50+ projects with 99,99% uptime reliability
person.name
🧑‍🍼Father of 3
person.name
Pavlo
Tech Lead
15 y. of experience | Managed 40+ developers as Tech Lead
person.name
💨 Motorhead
🧰 Tinkerer
person.name
Dmytro
Tech Lead
15 y. of experience | 10+ AWS projects led
person.name
🏎️ F1 Fan
🍻 Beer connoisseur
☕ Coffee aficionado
person.name
Yana
Design Lead
12 y. of experience | 100% UI/UX acceptance rate after user tests
person.name
👩‍🎨 Local artist
🧘‍♀️ Yoga practitioner
🦻Hearing Accessibility Advocate
📚 Bibliophile
person.name
Bogdan
QA Lead
17 y. of experience | QA Lead on 10+ multi-domain projects
person.name
🎓 Nerd
⛷️ Ski fan
Strong Spirits expert
person.name
Andrii
Project Manager
8 y. of experience | 30+ projects delivered
person.name
🏎️ Junior Car Drifter
🧳 Traveller
☕ Coffee enthusiast
person.name
Tetiana
Business Analyst
5 y. of experience | Saves $30K on avg./client with discovery
person.name
🧠 Braving the unknown
💬 Empathy-driven communicator
🏖️ Passionate traveler
person.name
Andrii
Founder & CEO
Clockwiser from Day 1 | Led Clockwise to Top Ukrainian IT Company
person.name
🎤 Karaoke champion
🧠 Quiz monster
🐈 Cat team
person.name
Bogdan
Head of Delivery
10 y. of experience | Set up delivery with 99.88% acceptance rate
person.name
🏂 Snowboarder
💿 DJ
🥁 Drummer
☕ Coffeeholic
person.name
Serhii
Head of Client Relations
11 y. of experience | 98% client satisfaction rate
person.name
🚞 Traveller
Gym rat
☕ Coffeeholic
person.name
Natalia
Head of People
10 y. of experience | 100+ hired talents
person.name
Hyggeist
Wanderlust Soul
🏊‍♀️ Swimmer
🕯️ Detail Aesthete
person.name
Mike
Solution Architect
15 y. of experience | 50+ projects with 99,99% uptime reliability
person.name
🧑‍🍼Father of 3
person.name
Tetiana
Business Analyst
5 y. of experience | Saves $30K on avg./client with discovery
person.name
🧠 Braving the unknown
💬 Empathy-driven communicator
🏖️ Passionate traveler
person.name
Andrii
Project Manager
8 y. of experience | 30+ projects delivered
person.name
🏎️ Junior Car Drifter
🧳 Traveller
☕ Coffee enthusiast
person.name
Bogdan
QA Lead
17 y. of experience | QA Lead on 10+ multi-domain projects
person.name
🎓 Nerd
⛷️ Ski fan
Strong Spirits expert
person.name
Yana
Design Lead
12 y. of experience | 100% UI/UX acceptance rate after user tests
person.name
👩‍🎨 Local artist
🧘‍♀️ Yoga practitioner
🦻Hearing Accessibility Advocate
📚 Bibliophile
person.name
Dmytro
Tech Lead
15 y. of experience | 10+ AWS projects led
person.name
🏎️ F1 Fan
🍻 Beer connoisseur
☕ Coffee aficionado
person.name
Pavlo
Tech Lead
15 y. of experience | Managed 40+ developers as Tech Lead
person.name
💨 Motorhead
🧰 Tinkerer
person.name
Mike
Solution Architect
15 y. of experience | 50+ projects with 99,99% uptime reliability
person.name
🧑‍🍼Father of 3
person.name
Natalia
Head of People
10 y. of experience | 100+ hired talents
person.name
Hyggeist
Wanderlust Soul
🏊‍♀️ Swimmer
🕯️ Detail Aesthete
person.name
Serhii
Head of Client Relations
11 y. of experience | 98% client satisfaction rate
person.name
🚞 Traveller
Gym rat
☕ Coffeeholic
person.name
Bogdan
Head of Delivery
10 y. of experience | Set up delivery with 99.88% acceptance rate
person.name
🏂 Snowboarder
💿 DJ
🥁 Drummer
☕ Coffeeholic
person.name
Andrii
Founder & CEO
Clockwiser from Day 1 | Led Clockwise to Top Ukrainian IT Company
person.name
🎤 Karaoke champion
🧠 Quiz monster
🐈 Cat team
person.name
Tetiana
Business Analyst
5 y. of experience | Saves $30K on avg./client with discovery
person.name
🧠 Braving the unknown
💬 Empathy-driven communicator
🏖️ Passionate traveler
person.name
Andrii
Project Manager
8 y. of experience | 30+ projects delivered
person.name
🏎️ Junior Car Drifter
🧳 Traveller
☕ Coffee enthusiast
person.name
Bogdan
QA Lead
17 y. of experience | QA Lead on 10+ multi-domain projects
person.name
🎓 Nerd
⛷️ Ski fan
Strong Spirits expert
person.name
Yana
Design Lead
12 y. of experience | 100% UI/UX acceptance rate after user tests
person.name
👩‍🎨 Local artist
🧘‍♀️ Yoga practitioner
🦻Hearing Accessibility Advocate
📚 Bibliophile
person.name
Dmytro
Tech Lead
15 y. of experience | 10+ AWS projects led
person.name
🏎️ F1 Fan
🍻 Beer connoisseur
☕ Coffee aficionado

Awards

Show more
Top Software Development Company, 2025
Top Software Development Company, 2025
Top IT Services Company, 2025
Top IT Services Company, 2025
Listed Among Top 1000 Companies Globally
Listed Among Top 1000 Companies Globally
Top NodeJS Developers, 2025
Top NodeJS Developers, 2025
Top Managed Service Provider in 2025
Top Managed Service Provider in 2025
01 | 25

Code that works. Process built on real cases.

We apply what’s worked across 200+ JS products while keeping focus on your goals, so that the process and result meet your expectations.
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