The Best Custom Software Development Companies in Seattle

We evaluated 63 custom software development in Seattle based on 10 different variables to give you a list of the best custom software development in the area. Our reviews of the top 15 custom software development in Seattle include important information, such as costs, features, and what customers are saying.

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How We Chose the Best Custom Software Development Companies in Seattle

Seattle is one of the fastest growing tech hubs in the United States, making it home to many software development companies. Each firm flaunts its own features and services, but businesses don’t always have the luxury of time to select the best one. We’ve sampled a large variety of software development companies in Seattle based on objective criteria, and we’ve ensured your small business can stand to gain something from one or more of these companies.

Multiple Service Lines

Goals and objectives vary by business, and it’s important to choose a software development company that can help your business achieve them. Our method of selection included choosing firms that offer a multitude of service lines, such as custom software development, UX/UI design, and mobile app development. No matter whether your website needs a new and improved design or your businesses’ operations rely on specific software, there’s a development company that can cater to your needs.

Size of Firm

Both small and large software development companies come with their own advantages and disadvantages. The number of employees can affect response time, service line variety, and more. We’ve made sure to select a diverse range of company sizes, because we understand that some small businesses require the manpower and influence of larger firms, while others don’t.

Industry Focus

Most small businesses operate within a single industry because of size and budget constraints. The companies we’ve chosen specialize in a variety of industries, such as e-commerce, legal, or media. So if you’re a Seattle based business thinking of launching a new e-commerce website but don’t quite know the ins and outs of developing a website, our list of the best custom software development companies can help you make the right choice.

The 15 Best Custom Software Development Companies in Seattle


AccelOne

AccelOne
608 State St. S., #100
Kirkland, WA 98033
800-863-6814

Seattle-based custom software development company AccelOne offers mobile software development for native and hybrid cross-platform applications on iOS/Android and Unity/Native. It uses programming languages such as Java, PHP, C++, .NET, and Node.js to create back-end/UX design, and JavaScript, Angular.js, React, and PHP when developing front-end/UI design web design. It also offers database/cloud development, as well as large-scale enterprise systems development.

The firm has an additional offices in Las Vegas and Buenos Aires, Argentina, where it provides access to human resources at 50% of the cost of U.S.-based resources, allowing the company to offer quality services at a reduced price.

PriceService LinesDetails
$50-$99/hrCustom Software Development
UX/UI Design
Mobile App Development
>Number of employees: 10-49
>Notable clients:  Xapo, Turner Broadcasting, HSBC, WPC
>Industries served:  E-Commerce, Fintech, and Healthcare
>More info at accelone.com


AltaSource Group

AltaSource-Group
625 4th Ave., Suite 205
Kirkland, WA 98033
425-827–7711

AltaSource Group is a U.S.-based software consulting company located in Kirkland. It provides assessments of software programs that small businesses might be missing. With expertise in software development and IT solutions, AltaSource Group offers web design/development, mobile development, and enterprise and cloud solutions to small businesses across the Seattle area.

Software development and IT projects are offshored to the company’s center in Buenos Aires, Argentina, which offers more competitive pricing than the U.S. office while being in a similar time zone, making transactions smoother and quicker than offshoring to other countries.

PriceService LinesDetails
$50-$99/hrWeb Design
Web Development
Mobile App Development
>Number of employees: 50-249
>Notable clients: ESPN, Disney, Emdeon, Coalfire, Expedia
>Industries served: Media, Travel and Leisure, Arts, Entertainment & Music
>More info at altasourcegroup.com


Bilberrry

Bilberrry
111 S Jackson St.
Seattle, WA 98104
206-818-7436

As a full-service agency, Bilberrry has worked with clients including ambitious start-ups, global nonprofits, and Fortune 500 companies to design and develop software. It specializes in back- and front-end development, systems design, UX/UI design, mobile application research and development, high-load enterprise systems, and web application development. Bilberrry’s portfolio of work includes the mobile-driven marketplace app OfferUp, modelling tool Impinj, and custom arts solutions website Grand Image.

With offices in Seattle and Kyiv and 34 full time employees, Bilberrry retains a flat organization structure, which helps get more personal with clients and solve problems more efficiently.

PriceService LinesDetails
$100-$149/hrWeb Design
Custom Software Development
Web Development
>Number of employees: 10-49
>Notable clients: University of Washington, Impinj, PepsiCo
>Industries served: Business services, Consumer products & services, Financial services
>More info at bilberrry.com


CASoft Seattle

CASoft-Seattle
11335 NE 122nd Way, Suite 105
Kirkland, WA 98034
425-292-1578

This Seattle-based software development company provides service tailored to clients’ individual needs. With core competency in several programming languages such as Java, ASP.NET, Node.js, PHP, and AngularJS, it ensures clients’ structural and architectural platform specifications are met. CASoft Seattle’s UX/UI designers optimize business web pages, increasing quality traffic and minimizing server downtime.

The company’s SEO services start by analyzing the competition and then crafting a PPC campaign with the intent of increasing ROI for the client. The website also provides a free SEO checker, which can be used to provide a basic overview of current search engine visibility.

PriceService LinesDetails
$50-$99/hrSearch Engine Optimization
Web Design
Web Development
>Number of employees: 2-9
>Notable clients: Kamville International LLC, Weple
>Industries served: Entertainment, Information Technology
>More info at casoftseattle.com


Jetstream Software

Jetstream-Software
218 Main St., #438
Kirkland, WA 98033
425-827-9273

From defining requirements, writing custom software code, and designing UX/UI to testing and deploying products, Jetstream professionals can assist clients through every step of the project. Each developer at Jetstream is an expert in his/her niche, be it software testing, developing VR applications, or writing cohesive code on Python/Ruby. The company’s offside development offers several advantages, such as lower equipment and operation costs, increased staffing flexibility, and quicker project ramp-up.

Jetstream Software participated in the development of the .NET platform, giving the firm a leg up when it comes to building .NET-based technologies.

PriceService LinesDetails
$25-$49/hrTesting Services
IT Services
Custom Software Development
>Number of employees: 10-49 
>Notable clients: IBM, Nike, Microsoft, Siemens, AT&T, Xerox
>Industries served: Technology, Business Services
>More info at jetstreamsoftware.com


Lunarbyte.io

Lunarbyte
11300 Third Ave.
Seattle, WA 98125

Comprising a group of passionate and driven Seattle based developers, Lunarbyte.io has partnered with start-ups, marketing agencies, and enterprises across the globe to build and launch successful digital projects. Its areas of expertise include developing web and SaaS applications, using client-side technologies and cloud infrastructure, crafting beautiful iOS/Android and cross-platform applications using the newest SDKs, setting up cloud infrastructure and migrating data to cloud services, and integrating SaaS and APIs to streamline business processes. Front-end and server-side technicians work in tandem to tackle and deliver projects on time. The firm’s small workforce makes it ideal for smaller businesses.

PriceService LinesDetails
$100-$149/hrWeb Development
Custom Software Development
Mobile App Development
>Number of employees: 2-9  
>Notable clients: Preflight Mitigator, Dollar Flight Club, Storytellers for Change, Protection Home Inspectio, Mercado.soy
>Industries served: Business services, Advertising & Marketing, Real Estate
>More info at lunarbyte.io


Mobcoder

Mobcoder
P.O. Box 28922
Seattle, WA 98118
206-295-9310

A mobile application development company in Seattle, MobCoder caters to start-ups and leading app publishers alike. Every developer at MobCoder is handpicked based on expertise in his or her respective niche, which makes for a highly efficient development team. On the front end, Agile methodology is applied when approaching projects, including DevOps, analysis, prototyping, QA testing, and constant support. MobCoder has extensive experience in Android/iOS/cross-platform development, UI/UX design, Node.js, IoT App development, blockchain, Ruby on Rails, iBeacon, and more. From developing on Xamarin to creating innovative UI with Adobe Illustrator, MobCoder has a can-do attitude that keeps customers loyal.

PriceService LinesDetails
$50-$99/hrMobile App Development
Web Development
Custom Software Development
>Number of employees: 50-249  
>Notable clients: Proctor Lane, Coinstar, University Of Washington,.Transcend-360, FitKit
>Industries served: Designing, Information Technology
>More info at mobcoder.com


New Relic

New-Relic
2101 Fourth Ave.
Seattle, WA 98121

New Relic’s observability platform helps clients gather telemetry data into a single place, delivering full-stack observability and power AI-driven insights, which improves service reliability and reduces time to market. In addition, the firm provides DevOps services, cloud adoption, cloud native, and digital customer experience services. DevOps helps clients deliver software more efficiently by reducing complexity of management and reaching problem resolutions faster. It utilizes cloud computing platforms and virtualization platforms — such as VMware, Microsoft Azure, and OpenStack — to facilitate software development and allocate resources more efficiently.

An international firm, New Relic also operates in Japan, Korea, France, and Germany.

PriceService LinesDetails
$50-$99/hrE-Commerce Development
Mobile App Development
Custom Software Development
>Number of employees: 250-999
>Notable clients: REI, Office Depot, Mlbam, HauteLook, Trulia 
>Industries served: Media, Financial Services, Others
>More info at newrelic.com


Northwest Independent

Northwest-Independent-Ruby-Development
1517 12th Ave., #201
Seattle, WA 98122

Northwest Independent (NIRD) is a team of experienced code writers that engages with clients to create custom software, websites, and web applications that benefit small start-ups and large businesses alike. The firm has extensive knowledge in AngularJS, Chef, and Ruby. NIRD uses Ruby on Rails, an open-source web application framework based on the Ruby programming language. NIRD describes itself as a full-stack Ruby development consultancy, and it specializes in providing innovative solutions in UX/UI; development for digital platforms including web, mobile, and video; and consulting for start-ups.

Because of its focus on Ruby development, NIRD is one of the only custom software companies in Seattle that has extensive knowledge about the framework.

PriceService LinesDetails
$150-$199/hrCustom Software Development
Web Development
>Number of employees:  2-9
>Notable clients: University of Washington, Avvo, Whitepages
>Industries served: Education, Travel and Leisure, Consumer Products & Services
>More info at Northwest Independent


OpenMarket

OpenMarket
2211 Elliott Ave., Suite 400
Seattle, WA 98121
877-412-6189

OpenMarket is an Amdocs subsidiary team of mobile messaging application services, which specializes in developing custom software solutions for various clients, including start-ups and small businesses in Seattle. It has assisted clients with creating custom SMS, MMS, and RCS API’s as well as design messaging campaigns with OpenMarket’s Mobile Engagement Platform.

The company has 19 years of experience creating thousands of mobile campaigns, with 24/7 technical live support spanning all time zones, and adheres to the highest security and privacy standards, such as ISO 27001. Businesses can use OpenMarket’s Indigo platform to facilitate acquisition and provisioning of new originators, with no experience in mobile messaging or tech expertise needed.

PriceService LinesDetails
$25-$49/hrCustom Software Development
IT Services
Mobile App Development
>Number of employees: 250-999
>Notable clients: FICO, Virgin Trains, Ginger Hotels
>Industries served: Hospitality and Leisure, Consumer Products and Services, Healthcare & Medical
>More info at openmarket.com


Pacific Software Publishing

Pacific-Software-Publishing
1404 140th Pine St.
Bellevue, WA 98007

Each business has a unique set of proposals, which requires unique software. Pacific Software Publishing (PSPinc) is dedicated to creating custom web applications, mobile applications, and system software for start-ups and enterprises across Seattle. PSPinc uses in-house SaaS solutions such as Parcom — an email and web platform for no-frills hosting — to leverage business growth. Expert UI/UX designers create responsive web pages and logos, which helps set clients apart from one another. The firm’s R&D team tests and explores new technology options, helping PSPinc build innovative software without needing to outsource any of its work overseas.

PriceService LinesDetails
<$25/hrWeb Development
Custom Software Development
Social Media Marketing
>Number of employees: 10-49
>Notable clients: Ezell's Famous Chicken, W Foster School of Business, Seattle Executives Association, Reve 21
>Industries served: Education, Business Services, Consumer Products & Services
>More info at pspinc.com


projekt202

projekt202
999 Third Ave., Suite 1501
Seattle, WA 98104
206-602-6999

With experience-driven transformational strategies, projekt202 has helped and continues to help small developing businesses and large corporations with all of their software development needs. The company uses a blended teams strategy, so technologists, designers, strategists, and markets work together to deliver fast responses to clients.

Projekt202 services includes UX/UI design, front- and back-end development, and software development using DevOps, Ccoud, and NoSQL. The firm also provides campaign and digital advertising services to any prospecting business wishing to reach a larger audience.

A subsidiary of Amdocs, projekt202 has additional offices in Atlanta, Austin, Chicago, Dallas, and San Francisco. Three Asia-Pacific offices can be found in Manila, Kuala Lumpur, and Tokyo.

PriceService LinesDetails
$50-$99/hrCustom Software Development
UX/UI Design
Web Development
>Number of employees: 250-999
>Notable clients: Mercedes-Benz Financial Services, Capital One, Samsung Electronics
>Industries served: Financial Services, Consumer Products & Services, Business Services
>More info at projekt202.com


Seattle Software Developers

Seattle-Software-Developers
4-102nd Ave. NE
Bellevue, WA 98004
425-256-2815

Based in the city it’s named for, Seattle Software Developers (SSD) provides custom software development services to any size business. With 27 years of experience and 907 projects completed, it retains its status as one of the most prominent software development companies in Seattle. Clients come to SSD for a variety of reasons, such as for system integrations, custom dashboards, booking platforms, software consultancy, or CRM systems.

The first major contract of the company was with Steve Jobs, whom SSD helped create the software that ran Cube, the base of iOS today.

The firm has offices in London, Bellevue, Rome, and Augsburg.

PriceService LinesDetails
$100-$149/hrWeb Development
Custom Software Development
Mobile App Development
>Number of employees: 11-50
>Notable clients: Cameron Chisholm Nicol, BLOCK, FJM Property
>Industries served: Arts, entertainment & music, Information technology, Media
>More info at seattlesoftwaredevelopers.com


Swecker

Swecker
506 Second Ave., Suite 1400
Seattle, WA 98104
855-367-7632

Since 2003, Swecker has delivered digital marketing solutions through creative innovations of its main service areas to start-ups and large firms alike. Areas of expertise include mobile application development, WordPress and Drupal CMS development, custom software development, digital UX/UI design, and artificial intelligence.

It bolsters its portfolio with a variety of projects for clients, such as a new website for Mackie, a world-famous professional sound equipment manufacturer. Swecker blends responsive design with CMS technology to enable effective content control. The firm has also worked closely with Farmers Life Insurance to develop annual interactive CD software that’s compatible with PC/Mac.

PriceService LinesDetails
$100-$149/hrWeb Development
Web Design
Custom Software Development
>Number of employees:  2-9
>Notable clients: Microsoft, Holland America, Farmers Insurance, Mackie, House Wine, The Pike Place Market
>Industries served: Information Technology, Advertising & Marketing
>More info at swecker.co


TECLA

TECLA
500 Yale Ave. N.
Seattle WA 98109

TECLA is a recognizable name in the custom software development world, known as a hiring marketplace for remote candidates across the Americas. It handles clients’ requests for interviewing and hiring top software developers, product designers, and QA analysts around the globe. Unlike traditional offshoring operations, TECLA promises to select only experienced talent from over 13,000 top professionals, not unqualified freelancers.

With talented software engineers and architects proficient in web and mobile design and experienced in Ruby, Node, React, Angular, iOS, Android, and Python, TECLA is trusted by Seattle start-ups and larger firms alike.

PriceService LinesDetails
$25-$49/hrCustom Software Development
Web Development
IT Staff Augmentation
>Number of employees: 10-49
>Notable clients: Roche, BMW, Pepsi, Miller, Witlee.com, Waggl.it
>Industries served: Other Industries, Information Technology, Marketing & Advertising
>More info at tecla.io

Questions to Ask Custom Software Development Companies

With so many custom software development companies in Seattle each offering similar features, it’s important to ask the right questions during your initial discovery call or demo. To help you make the right inquiries, we put together a downloadable list of questions to ask your prospective custom software developers.

Download the questions to ask custom software developers