🚀 Startup / SaaS
Web Developer for Startups & SaaS
Accelerate your growth with web solutions built for startups: high-conversion landing pages, API integrations, custom back-offices. Wizaplace, YesPark, Homagames and Safety Line are among my references.
💡 Startup / SaaS — En bref
- ⏱ Timeline : From a few days to a few weeks depending on project complexity
- 🔧 Stack : React, TypeScript, REST API, CI/CD, conversion landing page
- ✅ References : Wizaplace, FrenchRDV, Homa Games, Yocuda
- 🌍 Area : Paris, Lyon, Marseille and all of France (100% remote possible)
- 📬 Quote : Free, response within 24h
Startup & SaaS Web Expert
Launching a SaaS is first a marketing problem: the landing page must convince in 10 seconds, the pricing page must overcome objections, and onboarding must convert free trials into paid subscriptions. Xavier Kain supports startup and micro-SaaS founders in designing and developing their marketing tools: high-conversion landing pages, React dashboards, Stripe Billing integrations and customer portals.
My SaaS achievements include landing pages with integrated A/B testing (Plausible, PostHog), automated email onboarding flows (Resend, Mailchimp), React customer portals with Stripe billing space and REST APIs documented with Swagger. I also develop internal analytics dashboards and reporting tools for product teams.
Services for Startups & SaaS
SaaS Landing Page
Conversion-oriented SaaS landing pages: impactful product messaging, transparent pricing section, guided user onboarding, and continuous A/B testing. Every element is tested to maximise sign-up rates and reduce time-to-value for new users.
API Integrations
Complete API integrations for SaaS: Stripe for billing and subscriptions, Intercom for in-app support, HubSpot for CRM, Slack for internal notifications, Zapier/Make for automations. Robust webhooks to synchronise all your business tools in real time.
Analytics & tracking
Complete analytics instrumentation to decide fast: Google Tag Manager, Mixpanel or Amplitude for business events, Google Analytics 4 for audience flows, Hotjar for session recordings. Custom dashboards to track MRR, churn and activation metrics.
Custom Back-office
Custom back-offices for SaaS and startups: user management with granular role and permission systems, real-time operational dashboard, automatic CSV/PDF exports, and audited activity logs. React frontend + PHP or Node.js API stack.
Projects in this sector
Concrete achievements for clients in the Startup & SaaS sector.
What clients say
“I had the opportunity to work with Xavier Kain as a UI designer/graphic artist, and everything went perfectly. I particularly appreciated his speed of execution, responsiveness and ability to stay true to the defined graphic charter.”
“On top of efficiency and great responsiveness, Xavier is easy-going and friendly. A trusted web partner.”
“We used Xavier's services for our website redesign and were delighted!”
Frequently asked questions
What technical stack for a web startup?
In early stage, a static landing page + Typeform can be enough. For MVP, PHP + relational database is very solid and low-cost. At scale, React frontend + API backend is the norm. I recommend not over-engineering from the start.
Can a startup's internal workflows be automated?
Yes, this is one of my strengths. Zapier, Make (Integromat) or n8n allow connecting dozens of tools (CRM, email, Slack, sheets) without code. For more complex workflows, I develop custom PHP or Python scripts.
How to measure the impact of a SaaS landing page?
Key metrics are: conversion rate (visitor to signup), cost per lead, bounce rate and heat maps. I set up Google Analytics 4 + Hotjar + A/B testing from launch to iterate quickly.
What is the difference between a landing page and a full SaaS website?
A landing page is designed for conversion: a clear message, a strong call to action, few distractions. A full SaaS site also includes feature pages, documentation, onboarding, a blog and sometimes an app portal. Both are complementary: the landing page captures, the site retains.
How to integrate a free trial or demo on a SaaS website?
Several approaches are possible: a sign-up form linked to Stripe Billing for free trials, a direct link to the app, contextual pop-ups triggered at the right moment (exit intent, deep scroll) or a demo calendar integrated via Calendly or HubSpot.
Which tools to use to track SaaS landing page conversions?
Google Analytics 4 for event tracking and conversion funnels, Plausible or Fathom for a GDPR-friendly cookie-free alternative, Hotjar or Microsoft Clarity for heatmaps and session recordings, and Segment to centralise data to your marketing tools.
Does your startup need a trusted developer?
Response guaranteed within 24h. Free and no-obligation quote.
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