Si digital
Si digital is a UK-based, boutique digital design and development agency (trading as Si digital, legal entity Something Interesting Limited) that builds bespoke websites, mobile apps, and custom software for global enterprise clients, anchored by its proprietary Faraday SaaS-to-digital middleware.
- Company typePrivate
- Founded2002
- HeadquartersSouthsea, United Kingdom
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Si digital does
Si digital is a UK-based digital design and development agency operating since 2002 from Southsea, Portsmouth (legal entity: Something Interesting Limited). The firm delivers bespoke websites, mobile applications, brand identities, and custom software to a global enterprise client base that includes Harwin, Hasbro, BMW/MINI (via CalAmp), Wightlink, Howden (Tilt insurance app), and Co-op Insurance. It self-describes as a "small team" and earns repeat engagements, with several client relationships exceeding ten years, through a consultative, discovery-led sales motion and a Discovery → Design → Develop → Integrate → Support service stack.
The firm's defining technical asset is Faraday, a proprietary middleware layer that functions as a two-way data hub between client SaaS systems (Salesforce, Microsoft ecosystem including Entra/OpenAI/Dynamics, Bynder, payment gateways, Elasticsearch) and its delivered digital products. Delivery is concentrated around Payload CMS as the preferred headless CMS, React Native for cross-platform mobile, and AWS hosting fronted by Cloudflare WAF/DDoS controls. Notable engineered outcomes include a custom 3D cable configurator for Harwin built on the CADENAS rendering engine with Salesforce submission and a Hasbro Spark platform that has collected more than 9,000 toy-invention submissions.
Commercially, Si digital operates a project-based professional services model supplemented by monthly retained support engagements with weekly or fortnightly check-ins. Pricing is quote-based, determined through discovery workshops, and is not publicly disclosed. Marketing is dominated by organic content (Lab Notes blog, LinkedIn, Instagram, Medium, behind-the-scenes content) with no paid acquisition. The company has no disclosed external funding, parent company, subsidiaries, or M&A activity; operating geographies span the UK, USA, and Germany via client delivery rather than physical offices.
Si digital firmographics
Firmographics- Name
- Si digital
- Legal name
- Something Interesting Limited
- Website
- https://sidigital.co
- Company type
- Private
- Founded year
- 2002
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Si digital is a UK-based, boutique digital design and development agency (trading as Si digital, legal entity Something Interesting Limited) that builds bespoke websites, mobile apps, and custom software for global enterprise clients, anchored by its proprietary Faraday SaaS-to-digital middleware.
- Ownership category
- akta.pro rank
Where Si digital is headquartered
LocationHeadquarters
- HQ city
- Southsea
- HQ country
- United Kingdom
- HQ region
- Europe
Offices1 record
Markets served
Si digital business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure
Revenue model
- Digital Design and Development Services: Project-based professional services revenue model. The company designs and develops bespoke websites, mobile apps, brand identities, and custom software for clients. Revenue is generated through project fees, with ongoing retained support services providing recurring revenue from existing client relationships. The agency emphasises long-term partnerships with many clients working with them for over a decade.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Monthly | Consultation and Discovery |
| Subscription | Monthly | Retained Support Services |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels5 records
Si digital product offering
Product offeringCore offering
Si digital is a UK-based digital design and development agency that builds bespoke websites, mobile applications, custom software, and brand identities for global B2B clients. The firm delivers end-to-end services spanning discovery, design, development, integration with third-party SaaS ecosystems (Salesforce, Microsoft, payment gateways), and ongoing retained support, supported by their proprietary Faraday middleware.
Product overview
Si digital is a digital agency offering design and development services built around its proprietary Faraday middleware. The core offering is a platform-plus-services model: Faraday serves as the central middleware connecting SaaS systems (Salesforce, Bynder, payment gateways) with digital products. Around this, services include Discovery (workshops, research, solutions), Design (branding, digital design, graphic design), Development (websites via Payload CMS, mobile apps via React Native, custom software), Integration Services (Salesforce, payment gateways, asset management), and Support (retained support, hosting on AWS with Cloudflare security). The portfolio is service-led rather than a single packaged product, with each engagement tailored to client needs.
Differentiator
Problem solved
Functional benefit
Brands
- Faraday: Custom middleware solution that connects SaaS systems with websites and apps, providing efficient data synchronization, flexible platform switching, and secure centralized connections.
Products and services
- Discovery Services Consultative upfront discovery engagement in which Si digital works with prospective B2B clients to map requirements, define scope, and shape bespoke digital product roadmaps prior to design and build.
- Design Services Design phase of bespoke digital engagements, producing UX, UI, and brand identity work for websites, mobile apps, and custom software built for B2B clients.
- Development Services Custom build of bespoke websites, mobile apps, and software products using modern stacks including Next.js, React Native, and Payload CMS, delivered by an in-house development team based in Southsea, Portsmouth, UK.
- Integration Services Service connecting bespoke digital products with client SaaS ecosystems such as Salesforce, Microsoft platforms, payment gateways, and digital asset management systems, enabled by the proprietary Faraday middleware.
- Retained Support Services Ongoing partnership-style support subscription providing continuous hosting, maintenance, and development of delivered digital products for B2B clients after launch.
- Faraday Middleware Proprietary middleware product that connects third-party SaaS systems to bespoke digital products without requiring costly full rebuilds, used by Si digital to deliver integration work for B2B clients.
Quantifiable outcome
- 90% reduction in page load times for Harwin's website rebuild
- +2 more outcomes
Companies that use Si digital
Customer profileNamed customers7 records
Segments2 records
Ideal customer profiles1 record
Si digital technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration10 records
AI capability1 record
Feature5 records
Si digital partnerships and signals
Strategic signalPartnerships
Eleven partnerships are on record, tiered core, strategic, long-term and supporting.
- SalesforcecoreSalesforce integration is a core part of Si digital's service offerings. Using Faraday middleware, they connect Salesforce CRM data with client websites and apps. The integration enables real-time data synchronisation with Elasticsearch indexing for fast query performance.
- Payload CMScorePayload CMS is Si digital's preferred headless CMS platform. They position themselves as a Payload CMS agency and have built their own Payload Playground demonstration environment. Figma's acquisition of Payload CMS is noted as strengthening the platform's future.
- CalAmpstrategicSi digital worked with CalAmp as their front-end partner to design and build the connected car app for BMW and MINI. Si digital owned the entire front-end from UX design through React Native build.
- Wightlinklong-termOngoing partnership with Wightlink since 2017 for continuous website development. Si digital rebuilds platforms and develops new features including Best Fare Finder and Wightlink Explorer.
- HowdencorePartnership with Howden to build Tilt, their AI-powered digital-first insurance app. Si digital built the cross-platform mobile application with Microsoft enterprise ecosystem integration.
- AWS (Amazon Web Services)coreSi digital uses AWS for hosting client websites. AWS is described as an industry-leading cloud platform trusted by businesses worldwide, providing fast, reliable, auto-scaling infrastructure.
- CloudflarecoreCloudflare is used for security and performance enhancement, including Web Application Firewall (WAF), DDoS protection, and monitoring of malicious traffic before it reaches client websites.
- ByndersupportingDigital asset management integration for Harwin, allowing dynamic asset retrieval for images, videos, and documents via Faraday middleware and Laminas PHP tech stack.
- ElasticsearchcoreElasticsearch handles complex product queries and filtering, enabling millisecond response times for search across large catalogues. Used for Harwin's 4,000+ product filtering system.
- CADENASsupportingCADENAS rendering engine used for 3D preview in Harwin's custom cable configurator, allowing real-time 3D model updates as customers configure products.
- MicrosoftcoreMicrosoft ecosystem integration for Tilt insurance app including Microsoft Entra for authentication, Microsoft OpenAI for intelligent support, and Microsoft Dynamics CRM as system of record.
Scale indicators11 records
Recent moves6 records
Expansion highlights5 records
Si digital competitors and assessment
Company assessmentBroad incumbents
- EPAM Systems: Global digital engineering services firm delivering custom software, platform integration, and product development for enterprise clients. Competes for the same Salesforce/enterprise integration mandates but at substantially larger scale.
- GlobalLogic: Global digital product engineering company building bespoke software and integrated digital experiences for enterprise customers. Comparable in custom development + systems integration delivery, but with a much larger global engineering footprint.
- AKQA: Global digital agency offering brand, experience design, and bespoke digital product development for major enterprise and consumer brands. Overlaps with Si digital's design + custom-build service mix but serves much larger global clients.
- Endava: Global custom software and digital transformation company serving enterprise clients across financial services, insurance, and consumer products. Larger scale and broader geographic footprint but competes for the same bespoke software and integration mandates.
- Thoughtworks: Global technology consultancy specializing in custom software, platform engineering, and digital strategy for large enterprises. Comparable in custom development and integration services, but operating at significantly larger scale and breadth.
- BJSS: UK-headquartered IT and digital services consultancy delivering custom software, cloud, and enterprise integration projects. Operates in the same enterprise custom-development space but with substantially larger headcount and broader service portfolio.
Direct peers
- Itransition: Custom software development company delivering web, mobile, and SaaS integration projects for enterprise and mid-market clients. Directly comparable in bespoke build + integration delivery model, though typically operating at larger team sizes.
- Atomic Smash: Boutique UK digital agency building bespoke websites, applications, and digital platforms using modern stacks. Comparable in scale, consultative sales approach, and emphasis on long-term partnerships rather than transactional projects.
- Cyber-Duck: UK-based digital agency of similar size offering web design, development, and integration services to enterprise clients. Closely comparable in service mix (design + bespoke build + SaaS integration) and mid-market enterprise focus.
- NetConstruct: UK digital agency delivering bespoke web platforms, CMS builds, and system integrations for enterprise clients. Closely aligned in custom development, CMS, and integration services with a similar enterprise B2B customer profile.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
Si digital social profiles
Digital presenceSi digital compliance and trust
Trust signalCompliance1 record
Si digital financial estimates
Financial estimateRevenue estimate
Valuation estimate
Si digital leadership team
Management profileNumber of profiles
Profiles2 records
Si digital funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Si digital M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Si digital
What does Si digital do?
Si digital is a UK-based digital design and development agency that builds bespoke websites, mobile applications, custom software, and brand identities for global B2B clients. The firm delivers end-to-end services spanning discovery, design, development, integration with third-party SaaS ecosystems (Salesforce, Microsoft, payment gateways), and ongoing retained support, supported by their proprietary Faraday middleware.
Is Si digital a public or private company?
Si digital is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Si digital founded?
Si digital was founded in 2002. It employs 11 to 50 people.
Where is Si digital based?
Si digital is headquartered in Southsea, United Kingdom, in the Europe region.
How does Si digital make money?
One revenue line is on record: digital Design and Development Services.
Who are Si digital's main competitors?
Broad incumbents on record are EPAM Systems, GlobalLogic, AKQA, Endava, Thoughtworks and BJSS. Direct peers are Itransition, Atomic Smash, Cyber-Duck and NetConstruct.
Does Si digital have an API?
No public API is recorded for Si digital.