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Top Software Development Companies for JavaScript

10 of 54 software development companies ranked on evidence in the Q4 2026 edition.

JavaScript spans more ground than any other language on this list. It runs in every browser, on servers through Node, and inside mobile and desktop applications, so a firm listing it may be doing front-end interface work, back-end services, or both.

The useful clarification is which part of the stack, and with what. Front-end work is dominated by a handful of frameworks and the choice affects hiring for years afterwards. Back-end JavaScript competes with other server languages and is chosen for good reasons and bad ones. Ask why they would pick it for your project specifically — a clear answer indicates a team choosing tools, and a vague one indicates a team using whatever they already know.

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Between them, the 54 software development companies on this page cover web development (31), android (25), mobile app development (23) and .NET (22). 54 of them have written a profile you can read before you get in touch.

TrustList ranking

Q4 2026 edition

10 of 54 software development companies ranked on evidence held on 5 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.

Positions are fixed for the quarter; the next edition is due in January 2027.

How this is ranked About this edition

All software development companies 10 ranked SMEs 10 ranked

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Counterpart
Mobile App Development · Web Development · iOS App · Also in United States of America
Indianapolis custom software firm building web, mobile, cloud and AI systems for organisations that outgrow off-the-shelf tools
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Why #1: Founded 1993 — as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
KPV
Mobile App Development · Web Development · iOS App · Also in Lithuania
KPV is a Vilnius company, registered as UAB Kompiuterinis procesų valdymas, that designs and manufactures embedded electronic systems.
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Why #2 (shared): Founded 2002 — as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
CUDEV
Hospitality & Leisure · Web Development · Software Development · Also in Tallinn
CUDEV is a software development company that has provided engineering services since 2002.
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Why #2 (shared): Founded 2002 — as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
I-factory
Search Engine Optimization · E-Commerce Development · Digital Marketing
I-factory is an Italian web agency and software company that develops and sells technology packages for business use.
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Why #4: Founded 2004 — as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
evozon
Mobile App Development · Web Development · Software Development · Also in Romania
evozon is a software development company that started in Cluj-Napoca, Romania, in 2005.
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Why #5: Founded 2005 — as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
Ecometrica
Mobile App Development · Web Development · Web Design · Also in United Kingdom
Ecometrica makes software that lets companies and governments measure their climate impact and produce reports that stand up to audit.
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Why #6: Founded 2008 — as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
Filament AI
Web Development · Web Design · Financial Services · Also in Ontario and Europe
Filament AI is a software business that builds data-driven business applications, with a strong focus on private equity.
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Why #7 (shared): Founded 2016 — as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
Ardanis
SaaS · SME · Also in Ireland
Ardanis designs and builds custom software for organisations in the UK and Ireland, and has done so since 2016.
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Why #7 (shared): Founded 2016 — as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
ConnectPoint
Energy & Natural Resources · Mobile App Development · Web Development · Also in Poland
ConnectPoint helps manufacturing firms and utilities modernise their operations with software, data and industrial connectivity.
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Why #9: ISO 9001, ISO 27001 — as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
DB
Daring Bit Assembly, Inc.
Android · React · simple
Daring Bit Assembly, Inc., known as DBA, is a custom software development company in Birmingham, Alabama.
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Why #10: SOC 2 — as stated on its own website, read 29 Sept 2026
Not yet on record: client reviews, vetting.
Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
FastLogic
Consumer Products & Services · Mobile App Development · Web Development · Also in Poland
FastLogic is a software and electronics engineering company that designs custom hardware and software for its clients.
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On record: Team of 18+ — as stated on its own website, read 28 Sept 2026
AS
Adam Siekierski
Information Technology · Node.js · Frontend · Also in Poznań, Poland and Poznań
Hi ????! Thanks for visiting my site! I'm a 18 year old full stack developer, based in Poznań, Poland ????????
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AgileDevServices
Software Development · Web Services · Java · Also in Vilnius
AgileDevServices develops, customises and integrates software for clients, working from headquarters in Lithuania with representative offices in the Netherlands and the USA.
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Aplikacje webowe ERYS' Ryszard Plewnia
NodeJS
Aplikacje webowe ERYS' Ryszard Plewnia is the practice of an independent Polish programmer who makes software to order using web technologies.
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BitRefine Group
Supply Chain, Logistics, and Transport · Energy & Natural Resources · Mobile App Development · Also in Hong Kong
BitRefine Group is a software development company in Mongkok, Hong Kong, that works on turning large volumes of raw data into information businesses can act on.
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Boulder Engineering Studio
Consumer Products & Services · Arts, Entertainment & Music · Mobile App Development · Also in Colorado and Nice
Boulder Engineering Studio, known as BES, is a small engineering design and development firm in Boulder, Colorado.
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Brainfuel Solutions
eCommerce · Manufacturing · Government · Also in Seattle
Brainfuel Solutions is a technology company in India working in robotic process automation and application development.
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BTOB
Mobile App Development · Web Development · iOS App · Also in Mexico
Consultancy providing EDI, electronic invoicing, custom apps, ERP integration and cybersecurity to businesses of any size
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Build.One
Application Development · Cloud · Agile
Build.One is a platform for building business web applications end to end, now presented as the B1 Framework.
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Consdata
Mobile App Development · Web Development · iOS App · Also in Poland
Consdata builds digital sales software for banks and insurers, centred on its eximee platform.
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CTO Services
Mobile App Development · Web Development · iOS App · Also in United States of America
CTO Services is a consultancy led by Glenn Butler that offers part-time CTO support, C-level strategy and custom software and hardware development.
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DecisionIQ, Inc.
Energy & Natural Resources · Mobile App Development · Web Development · Also in Georgia
Engineering consultancy helping manufacturers adopt AI for predictive maintenance through consulting, training and cloud tools
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Directpl
Consumer Products & Services · Mobile App Development · Web Development · Also in Mexico
Directpl is a software development firm headquartered in Warsaw, Poland, run by Direct Communication.
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DlhSoft
Information Technology · .NET · HTML5
Software component maker offering Gantt chart, scheduling and Kanban libraries for .NET, JavaScript and Apple developers
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Top Software Development Companies for JavaScript

Counterpart

KPV

CUDEV

I-factory

evozon

Ecometrica

Filament AI

Ardanis

ConnectPoint

Daring Bit Assembly, Inc.

FastLogic

Adam Siekierski

AgileDevServices

Aplikacje webowe ERYS' Ryszard Plewnia

BitRefine Group

Boulder Engineering Studio

Brainfuel Solutions

BTOB

Build.One

Consdata

CTO Services

DecisionIQ, Inc.

Directpl

DlhSoft

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