Built on SaaSy
Custom SaaS Development & Integrations
UK-based developers building bespoke SaaS integrations, custom apps and middleware.
We tackle highly complex, custom solutions that exceed standard configurations, building the unique connectors, data bridges, and apps required to solve your niche business requirements.
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Your workflows are unique. Your software should be too.
When the standard platforms says "no", we're the partner that builds the "yes".
Trusted by over 300 companies worldwide.
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We write the code you need, to solve the complex challenges others can't.
Bridging The Technical Gap Between Your Platforms
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We build bespoke middleware and custom connectors to link your platforms with APIs, social networks, LLMs, internal systems and more - ensuring a seamless flow of data.
Building Bespoke Apps & Secure Migrations
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From custom widgets that solve niche problems, bespoke applications to meet your specific requirements to heavy-lifting scripts that transform customer data, to - we engineer the solutions to meet your exact requirements.
🇬🇧 UK-Based Team of Skilled Developers
Work directly with our in-house team of developers located in the UK. No outsourcing barriers, just clear communication and agile development cycles.
🛡️ ISO 27001 Compliant Security
Your data security is our priority. We operate with full ISO27001 compliance, guaranteeing that our custom solutions and hosted environments meet the highest international standards for information security.
Custom SaaS Integrations & Middleware Development
Seamlessly connect your platforms with each other and with your proprietary/internal systems. We build the bespoke middleware, custom connectors, and data bridges required to ensure your complex data environments function as one unified ecosystem.
Bespoke SaaS Applications & Custom Apps
Create unique apps or widgets that sit directly on top of your platforms. We engineer custom applications from the ground up, designed specifically to solve your unique business challenges and streamline your operations. We utilise our expanded languages and frameworks to build custom functionality that extends your platform’s capabilities beyond its standard limits.
Custom Full Stack Software Development
We tackle highly complex, custom environments that exceed standard configurations. Leveraging a diverse range of languages and frameworks, we architect full-stack solutions that are fully embedded into your specific workflows and systems.
SaaS Hosting & Ongoing Maintenance
Built by Us. Managed by Us. We don't just hand over the code and walk away. We provide secure, high-performance hosting in a location of your choice, as well as ongoing maintenance for every solution we build, ensuring what we deliver remains fast, secure, and up-to-date while you focus on your business.
FAQs
- What is custom SaaS development?
Custom SaaS development is the design and engineering of bespoke software, integrations, middleware and apps that go beyond what a standard SaaS platform can do out of the box. It's what you need when your workflow doesn't fit the standard template, when two platforms need to talk to each other, or when you need a custom feature the platform can't deliver. At Built on SaaSy, our UK-based developers solve those problems for businesses worldwide. - When do I need bespoke SaaS development versus standard configuration?
Standard configuration is right when your needs fit within the platform's existing settings, automations and integrations. Bespoke SaaS development is right when you've hit a wall: a platform can't connect to a system you rely on, you need a custom widget or workflow, or you're trying to bridge multiple platforms into one unified process. If your team is hearing "the platform can't do that", you've reached the point where Built on SaaSy can help. - Do you build custom integrations for monday.com, Intercom, Zendesk, Salesforce or HubSpot?
Yes. We build custom integrations across monday.com, Intercom, Zendesk, Salesforce, HubSpot, Freshdesk and Vonage, plus integrations to internal systems and APIs of any kind. Our team specialises in middleware, custom connectors and data bridges, so your platforms talk to each other and to the rest of your stack. As part of The SaaSy People, we combine certified platform expertise with custom development capability, which is rare in the market. - Do you build custom apps for the monday.com app marketplace?
Yes. We design and develop custom monday.com apps, both for private use within your account and for publication on the monday.com app marketplace. As a monday.com Platinum Partner, Advanced Delivery Partner and certified monday CRM specialist, we understand the platform deeply, which means our custom apps integrate cleanly and use monday.com's framework correctly. Speak to our team about your monday.com app idea. - Can you build LLM or AI-powered features into our software?
Yes. We build LLM and AI-powered features into custom SaaS applications, including AI agents, knowledge retrieval, automated content generation and intelligent workflows. We integrate with leading AI providers including OpenAI, Anthropic and Google, and combine that capability with our deep experience configuring Fin AI for customer service, named Intercom Solution Partner of the Year. Your AI features will be built securely and to your exact requirements. - How do you price custom SaaS development projects?
Custom SaaS development projects are scoped and quoted individually based on complexity, technology stack and timeline. Day rates start from £995 for a SaaSy developer, with most projects priced as a fixed-fee engagement after a discovery call. Ongoing hosting and maintenance is billed separately. Book a free consultation and we'll scope your build and provide a clear quote. - Are you a UK-based development team?
Yes. Built on SaaSy is delivered by an in-house team of UK-based developers. Working with us means direct communication, no outsourcing barriers and an agile development cycle. Our team is part of The SaaSy People, an ISO 27001 certified business trusted by over 300 companies worldwide. - Can you take over a project from another developer?
Yes. We regularly take over custom SaaS development projects from previous developers, including incomplete builds, legacy code that needs to evolve and projects where the original developer is no longer available. Our team will audit the existing codebase, identify what's reusable, and propose a clear path forward. Speak to our team about your situation and we'll outline next steps. - How long does a typical custom SaaS development project take?
Project timelines depend on scope, but most custom integrations are delivered within 4 to 8 weeks, bespoke applications within 8 to 16 weeks, and full-stack builds typically run 3 to 6 months. We start with a discovery and scoping phase, then break delivery into agile cycles so you see progress quickly and have visibility throughout. For an indicative timeline based on your specific build, book a free consultation. - Do you offer ongoing hosting and maintenance after the build?
Yes. We don't hand over the code and walk away. Every project we build can be hosted, monitored and maintained by our team in a location of your choice, ensuring your custom solution remains fast, secure and up-to-date as your business grows. Many clients move from a project engagement into an ongoing managed relationship with us, so their software keeps evolving alongside their business.