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if/else agency – web development on HubSpot
From high-performance websites to advanced technical consulting
In 2026, having a high-performance website and a robust digital ecosystem is no longer optional, it’s a business imperative.
That’s why if/else agency supports its clients in building innovative web solutions on HubSpot, from fully custom templates and bespoke websites to the implementation of advanced technical architectures designed to streamline data synchronization and significantly improve data accuracy.
Our team of full-stack developers works hand in hand with our marketing experts to connect your business tools within a single, unified platform, bringing your teams together around reliable, actionable data that will fuel your next business successes.
Our mission: deliver high-performance digital solutions without ever forcing you to choose between your ambitions and your budget.
Custom HubSpot themes, drag & drop templates, and advanced SEO-ready, responsive modules with options. A complete library of reusable sections to build, optimize, and scale your HubSpot website without us!
From €600 / day (excl.VAT)
High-performance HubSpot websites & front-end development
Looking to migrate your website to HubSpot CMS or enhance an existing HubSpot website?
With over 10 years of experience on the HubSpot platform, our team of certified developers supports you throughout the creation, redesign, and optimization of high-performing HubSpot responsive websites.
if/else agency designs modern, scalable, and fully custom websites based on your designs or an existing site. Built on a proprietary code foundation aligned with the latest web best practices, our approach combines agility, aesthetics, and performance.
Without requiring a full redesign, our team also develops custom HubSpot templates, reusable sections, and bespoke modules to improve your website’s flexibility, speed, and scalability.
We also handle technical bug fixes, performance optimization, and the development of advanced functionalities tailored to your teams’ operational needs.
The result: a powerful, scalable, and SEO-friendly HubSpot website, ready to support your digital growth.
From €800 / day (excl.VAT)
Custom HubSpot integrations, API & back-end development
Are you facing data synchronization issues, application silos, or information that doesn’t flow properly between your tools?
Some HubSpot integrations aren’t available natively or require highly specific adjustments. Our HubSpot-specialized full-stack developers design custom APIs to properly connect your business applications.
These tailor-made APIs ensure reliable data synchronization, automated workflows, and seamless data exchanges between HubSpot and your third-party tools (CRM, ERP, internal software).
The goal is simple: clean, accurate data, in the right place and at the right time to optimize your internal processes and overall performance.
The result: a smooth, reliable, and fully connected digital architecture, without unnecessary complexity.
From €600 / day (excl.VAT)
HubSpot advanced technical consulting for development teams
Some companies already have in-house development teams but require expert HubSpot guidance to design and deploy complex, custom architectures within an unfamiliar ecosystem.
In these cases, our teams step in as HubSpot technical consultants, supporting your developers by training, guiding and securing key technical decisions throughout the project.
This consulting typically includes a thorough review of your business processes, an audit of your existing technology stack, identification of the data to be migrated or synchronized between HubSpot and your existing systems (CRM, ERP, internal tools), as well as the definition of key workflows, milestones, and associated triggers.
The goal is to define a clear, clean and scalable architecture, along with a relevant action plan that enables your developers to independently implement the integrations, automations, and custom developments you need.
The result: empowered technical teams, controlled processes, and a HubSpot ecosystem perfectly aligned with your business objectives.
Trusted for our HubSpot expertise
More than 50 companies supported through HubSpot, web, and marketing projects
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Brand identity and web design
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CRM implementation, integration & architecture
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HubSpot CMS development (website, landing pages, blog)
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Software synchronization and API connections
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Marketing automation, acquisition and sales performance
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Tracking and data
Ready to become (very) satisfied customers?
I’ve worked with Garance, Chris, and Luc on several projects for various companies, and I highly recommend them. Communication has always been smooth, and they are true experts in building high-quality HubSpot landing pages that meet advanced functional requirements.
if/else agency deployed our HubSpot CRM solution by customizing both the interfaces and user journeys to perfectly align with our business needs. They took the time to truly understand our operational specificities and consistently provided valuable recommendations to adapt the platform to our working methods.
Whenever our requirements went beyond HubSpot’s standard functionalities, they helped us rethink our processes from a different perspective while always keeping our business goals and key performance indicators in focus.
if/else agency is a technically experienced HubSpot integrator that genuinely listens to user needs. They effectively bridge the gap between client expectations and the software’s capabilities. Their flexibility and responsiveness clearly demonstrate their commitment to delivering the results expected by their clients.
We will definitely continue working with them for our future HubSpot CRM customization and interoperability needs.
I've finally found my HubSpot CMS partner !
After a very well executed site redesign, I'm happy to have finally found my strategic partner to serve up the web experiences of my dreams! Excellent communication, very good planning, good advice and real support for our web developments. I highly recommend IF/Else.
[...] A big THANK YOU to the whole team! Thank you for your professionalism, creativity, and responsiveness! Special mention to Garance, who was PROACTIVE in responding to all my requests day and night... If/else Agency, a true strategic partner for even the craziest projects!
Luc and Garance have worked with us on a number of website development projects, from mock-up design to online launch. Their mastery of the HubSpot CMS, their rigor and professionalism are a real plus when it comes to optimizing website performance. Skills that are rare on the market!
We worked with if/else agency to redesign the theme of our corporate website. We're very satisfied with the result. The collaboration was seamless, they have real expertise and were proactive in making our project a success.
[...] The team demonstrated excellent listening skills and a keen understanding of our challenges. We highly recommend if/else agency for the quality of their support, their professionalism, and their ability to integrate effectively into a project team.
We called on If/Else to redesign our site and develop a dynamic calendar. Everything turned out just the way we wanted it, and we're very happy with the result - it makes our work so much easier!
[...] We have no hesitation in recommending If/Else Agency, who have supported us with exemplary professionalism.
Their technical expertise, combined with a genuine willingness to listen, guarantees solutions tailored to our needs.
A big thank you to the If/Else team for their responsiveness and invaluable support on a daily basis!
We worked with Luc and Garance on 2 separate projects: the optimization and design of the corporate site and the migration + redesign of another site. During these 2 projects, they demonstrated their mastery, rigor, complementarity and professionalism.
Very good collaboration with the IEA teams on the HubSpot CMS. We had to integrate a booking engine from a third-party business tool. Delivery on time and quality on target. A job well done.
A highly skilled team that is close to its clients. We regularly entrust them with Hubspot developments, and they always coordinate projects superbly. It's a pleasure to work with Garance, Luc, and Christopher.