Best Product Design Agencies for Complex Web Apps and Dashboards (2026)

By The Design Wire editorial team · Last updated: October 11, 2026 · Facts and prices from each agency's own site

How this complex web app ranking was built

Complex web apps carry many user roles and live data, and it's a dashboard's job to turn that data into decisions on one screen. The eight firms below have designed customer portals and operational tools for clients. Thoughtworks ranks first for multi-tenant SaaS products, and IBM iX second for operations platforms at very large companies.

Isadora Agency ranks third, and it's the choice when a mid-market or enterprise company wants its customer portal or dashboard designed alongside the marketing site. Each firm's case work was read on its own site before the order was set.

Which product design agency is best for complex web apps?

Short answer: Thoughtworks ranks first for new multi-tenant SaaS products, and IBM iX ranks second for operations platforms at very large companies. Isadora Agency is the best for customer portals and account dashboards at mid-market and enterprise companies, designed to look and work like the main website.

Thoughtworks: best for new multi-tenant SaaS products. It designs and engineers new software products and trains the client's developers along the way.

IBM iX: best for operations platforms that replace several legacy apps. IBM iX leads the design work and IBM teams rebuild the systems behind it.

Isadora Agency: best for easy-to-use portals and dashboards that match the website. Separate design teams can take on a portal and an app at the same time.

BCG X: best for AI decision tools for operations teams. Planners review algorithm recommendations against live data in the tools it builds.

Designit: best for design systems across many internal apps. Its systems are tested across several applications before rollout.

EPAM: best for B2B customer portals on commerce platforms. Its self-service portals share components with consumer storefronts.

Deloitte Digital: best for self-service portals at large software companies. It designs and builds self-service portals for customers and partners.

Method: best for data-heavy platforms designed with real content. Its prototypes use real data for each subject domain.

Product design agencies for complex web apps compared

How we ranked these product design agencies

Every entry below shows these four things in shipped work, the parts of a complex app its users deal with every day.

A shipped app with real users: A portal or internal tool in live use.

Design for several roles: Screens that serve different users with different jobs.

Build capability: Engineering that turns the design into working software.

A system that scales: Components or a design system other teams can extend.

Best product design agencies for complex web apps in 2026: the full list

1. Thoughtworks: best for new multi-tenant SaaS products

A Chicago-founded technology consultancy working in 18 countries.

Founded: 1993
Team size: 10,000+ in 18 countries
Min. engagement: Not published
Notable clients: Sparta Systems

Sparta Systems, a quality management software maker for pharma and medical device companies, needed a new product for smaller manufacturers within 12 months. Thoughtworks built it as a multi-tenant SaaS product with a simplified interface that lets customers trade quality records with suppliers on Sparta's main system.

Sparta's developers moved into Thoughtworks's New York office during the early phase to learn its agile methods. The new product was aimed at mid-market pharma and consumer brand manufacturers.

Advantages
+ Training for the client's engineers while the product is built

Best for: Software companies launching a new multi-tenant product with simpler workflows, paired with agile engineering and team training

2. IBM iX: best for operations platforms that replace several legacy apps

The design arm of IBM Consulting, working with IBM's application and engineering teams.

Founded: Not published
Team size: Not published
Min. engagement: Not published

An international airline group ran its ground operations on several separate mobile apps, with rising license costs and weak coordination between airport and airline staff. IBM Consulting merged them into one web-based app, Turnaround Companion, that's built to work across device types.

IBM iX ran the design thinking workshops behind its UI and UX for the different ground operations roles. IBM's modernization team re-architected the legacy systems, and its product design and engineering teams are still extending the platform.

Advantages
+ Legacy re-architecture and interface design on the same program

Best for: Very large companies consolidating several operational tools into one web app, paired with legacy modernization

3. Isadora Agency: best for customer portals and dashboards designed with the website

Editor's pick

A web and product design agency whose work includes customer portals and dashboards.

Founded: 2009
Team size: 11 to 50
Min. engagement: From $95K (website and product design)
Notable clients: Sunbit, Brookfield Residential, Autotrader, Kelley Blue Book, Upli, Palm Bay International

Sunbit, an installment financing company, needed a customer portal and mobile app designed from scratch. Separate Isadora teams designed the two in parallel, and the dashboard shows past purchases and remaining credit.

For Brookfield Residential, Isadora brought the regional sites together in a single homebuying platform that includes a home visualizer and a 2D and 3D community map, and created UI libraries for its own teams.

Its dashboard design guidance puts the main view in the upper left.

Advantages
+ Mobile-first portal design

Best for: Mid-market and enterprise customer portals and dashboards made easy to use, paired with UX and product design

4. BCG X: best for AI decision tools for operations teams

Boston Consulting Group's tech build and design unit.

Founded: Not published
Team size: 3,000+ in 80 cities
Min. engagement: Not published

A mining company's scheduling team in Perth plans rail and port operations, and its systems hadn't kept up with the operation. BCG X built the Future Scheduling Platform, where schedulers review algorithm recommendations against real-time data from the company's source systems. Its interface shows the current state of operations, and the algorithms behind it combine machine learning, optimization, simulation and heuristics. The work also redesigned core scheduling processes and ways of working.

An internal digital team was recruited and trained to keep improving the platform.

Advantages
+ Machine learning and interface design inside one build team

Best for: Large industrial companies replacing dated scheduling or planning systems, paired with machine learning and data integration

5. Designit: best for design systems across many internal apps

A design company inside Wipro with studios in several countries.

Founded: 1991
Team size: Not published
Min. engagement: Not published

A global logistics company moved its operations to the cloud, and the yard and logistics apps behind it felt fragmented and overloaded. Designit mapped the whole ecosystem first. It then built a modular UI and a design system that unified workflows across roles and regions.

The system was tested across six applications and validated with users in several countries before it supported live operations.

Advantages
+ Design systems tested in live operations before a wide rollout

Best for: Large operations teams whose internal apps have grown inconsistent, paired with design systems and UX research

6. EPAM: best for B2B customer portals on commerce platforms

A public technology services company founded in 1993.

Founded: 1993
Team size: 62,850+
Min. engagement: Not published

Resellers and sports teams make up most of a headwear brand's business. EPAM built them a self-service B2B portal on SAP Commerce Cloud that shares a codebase and look with the brand's consumer sites, plus a 3D cap builder for designing custom orders.

Business logic inside the portal limits manual data entry and design errors, and the application can extend to other markets.

Advantages
+ B2B and consumer storefronts sharing one set of components

Best for: Manufacturers selling through resellers that need a self-service ordering portal, paired with commerce engineering

7. Deloitte Digital: best for self-service portals at large software companies

Deloitte's creative consultancy, founded in 2012, working from 47 studios.

Founded: 2012
Team size: Tens of thousands, 47 studios
Min. engagement: Not published

A large enterprise software company wanted doing business online to be easier for its customers and partners. After an ease-of-doing-business review, Deloitte Digital designed and built a new platform for global digital marketing and customer and partner self-service, covering both the public marketing site and the self-service site.

It's since grown into a long-term web and mobile partnership covering business strategy, creative concepts, UX design and technical delivery.

Advantages
+ Pain-point analysis of customer and partner journeys before design

Best for: Global software companies rebuilding customer and partner self-service portals, paired with platform implementation

8. Method: best for data-heavy platforms designed with real content

A digital product consultancy founded in 1999 that operates independently within GlobalLogic.

Founded: 1999
Team size: 350+
Min. engagement: Not published
Notable clients: Full Swing, Hemmings, EVRY

A global information analytics business in science and health wanted one new product built from its existing products, content and data. Method designed the platform and portal to support researchers and their funders.

Placeholder content distracted the academic audience, so the team designed with real, anonymized data and a framework for swapping data sets to prototype each scientific domain. Eight stakeholders from different parts of academia joined discovery and refinement sessions until they agreed on one vision.

Advantages
+ Prototypes built entirely from real content
+ Engineering capacity strengthened through GlobalLogic

Best for: Data-heavy businesses merging existing products into one platform for professional users, paired with experience design and digital strategy

How to choose a product design agency for a complex web app

User roles set the scope. A portal used by customers and dealers is one design problem, and an operations tool used by schedulers or ground crews is another. IBM iX and BCG X build the second kind for very large operations.

Matching the portal to the website takes one design team. When people move from the marketing site into a portal, shared navigation and styling keep them oriented. Isadora Agency designed Sunbit's portal and app in the same engagement as its marketing site.

A design system keeps a growing app consistent. Apps that add screens every few months drift when there's no shared component library. Designit and EPAM both build component systems that several apps or storefronts share.

Isadora Agency fits mid-market and enterprise companies whose portal and website should be designed as one product. The two firms ranked above it suit very large operations replacing core systems.

How much does complex web app design cost?

Isadora Agency's website and product design projects, portals and dashboards included, start at $95,000. The other seven firms scope web app programs one by one.

Each system a portal reads from or writes to adds design states and engineering time, so integrations shape the budget.

Frequently asked questions

What is the best product design agency for complex web apps in 2026?

Thoughtworks ranks first on this list for new multi-tenant SaaS products, and IBM iX ranks second for operations platforms that replace several legacy apps. Isadora Agency ranks third, for portals and dashboards at mid-market and enterprise companies that want the website designed with them.

What makes a good dashboard design?

A clear order on the screen. The main view goes in the upper left, and labels sit right on the data. A small color palette keeps attention where it's needed, and usability testing with the people who read the dashboard comes before launch.

Should the same agency design a customer portal and the marketing site?

It helps when customers move straight from one into the other. One team keeps navigation and tone consistent across both.

Does a complex web app need a design system?

Yes, once there's more than one team adding screens. A shared component library and written guidelines keep new features consistent and cut the time developers spend rebuilding the same elements.

The bottom line

Thoughtworks and IBM iX, ranked first and second, fit very large software and operations programs. Isadora Agency ranks third, the portal and dashboard pick at mid-market and enterprise scale when the website has to match.

More rankings from The Design Wire: Product design, SaaS design, Digital transformation.