Available for Q3 2026

Freelance Developer SaaS & Business Platforms

I help businesses create custom business platforms, internal tools, SaaS products, and digital solutions that streamline operations and support growth.

Discuss your projectView my work
+7
years of experience
+20
projects completed
+12
satisfied clients
platform.ts
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import { Platform } from "@nova/core";
export const app = new Platform({
  stack: ["Next.js", "NestJS", "Postgres"],
  deploy: "AWS", // edge ready
  auth: true, billing: "stripe",
  analytics: true,
});
await app.launch();

Build

passing

Latency

38ms

Uptime

99.99%

+24% MRR
PostgreSQL
AI ready
Edge deploy
Type-safe API

Areas of Expertise

  • SaaS Platforms
  • Business Applications
  • Internal Tools
  • Client Portals
  • Mobile Applications
  • AI Integration
Challenges

The challenges I help you solve

These daily frictions silently cost your teams time, money, and momentum.

Too many Excel files

Data scattered across spreadsheets that no one trusts anymore.

Repetitive manual tasks

Hours lost every week in copy-pasting and re-entering data.

Dispersed data

Information siloed across five different SaaS subscriptions.

No operational visibility

Decisions made by gut feeling rather than real data.

Time-consuming workflows

Processes that should take a few minutes take days.

Blocking legacy systems

Aging software that hinders your new initiatives.

Services

How I can help you

An end-to-end product partnership: discovery, design, development, and scale.

01

Business platforms

Custom tools designed around your processes — not the other way around.

02

SaaS Development

Subscription products, dashboards, and user management.

03

Client portals

Secure client and partner spaces, role-based access, and polished UX.

04

Mobile applications

Cross-platform apps with native feel on iOS and Android.

05

AI & Automation

Automate repetitive tasks and integrate AI functionalities.

06

Technical consulting

Architecture, performance, and scalability — actionable advice.

Case Studies

Featured Projects

A curated selection of recent projects delivered for startups, agencies, and growing companies.

Livespark

SaaS

SaaS platform for performance analytics and monetization tracking for TikTok Live creators.

Next.jsNestJSPostgreSQLPrismaStripeTikTok Live APIAWSResendWebsocket
Read Case Study
  • +30 metrics analyzed
  • 100% of data centralized
  • Real-time analytics
Livespark
Withings – E-commerce Homepage Redesign
Case 02

Withings – E-commerce Homepage Redesign

HealthTech / E-commerce

Front-end development of a high-performance homepage for a large-scale e-commerce platform.

ReactSvelteAngularTypeScript
Read Case Study
Removall Carbon – Website Redesign & Content Platform
Case 03

Removall Carbon – Website Redesign & Content Platform

ClimateTech / Sustainability

Redesign and enhancement of the Removall Carbon website, including the creation of a fully modular content platform, new pages, and a multilingual blog experience.

ReactGatsbyWordPressWPGraphQLACF
Read Case Study
View All Case Studies
Tech Stack

Modern and proven technologies

A reliable toolkit chosen for long-term maintainability and performance.

Frontend

  • Next.js
  • React
  • TypeScript

Backend

  • NestJS
  • Node.js
  • Wordpress
  • Strapi
  • WebSocket

Database

  • PostgreSQL
  • Prisma
  • Rest API
  • Neon / Supabase

Mobile

  • Flutter
  • FlutterFlow

Cloud

  • AWS
  • Vercel

Payments & Authentication

  • Stripe
  • Resend
  • OAuth
Process

How projects are conducted

A clear and collaborative process to reduce risk and deliver value early.

  1. Step 01

    Discovery

    Understand your business, your users, and your objectives.

  2. Step 02

    Scoping

    Scope, architecture, and delivery roadmap.

  3. Step 03

    Development

    Iterations with weekly demos and feedback.

  4. Step 04

    Testing

    Automated and manual QA on critical paths.

  5. Step 05

    Deployment

    Controlled deployment with monitoring and handover.

  6. Step 06

    Continuous improvement

    Optimization, support, and new features.

A partner who understands code AND business.
About

A partner who understands code AND business.

Experienced Full Stack Developer in creating SaaS platforms, business applications, client portals, and scalable web solutions for businesses and agencies.

  • End-to-end development
  • Business understanding
  • Long-term collaboration
  • Technical expertise
Network

Need a complete digital team?

I specialize in SaaS platforms, business applications, and custom software development — and I rely on a trusted network to cover the broader needs of your projects.

UI / UX Design

User-centered interface design, wireframes, prototypes, and design systems for web and mobile.

Branding & Graphic Design

Visual identity, logos, marketing materials, and brand consistency across all digital channels.

Digital Marketing & Advertising

Google Ads, Meta Ads, and acquisition strategies to attract and convert more customers.

SEO & Content Strategy

Search engine optimization, editorial planning, and long-term visibility growth.

A single point of contact for your entire project

For more ambitious projects, I coordinate my trusted partners and manage technical delivery: you benefit from a complete solution while maintaining a single point of contact from start to finish.

PRICING

Typical Project Pricing

Every project is unique. These estimates provide a quick overview of the typical investment required depending on your needs.

Client Portal

Starting at

€4000

Secure online portal allowing customers, partners, or members to access their information and documents.

Included

  • Secure authentication
  • User dashboard
  • Document management
  • Messaging & notifications
  • Responsive interface
Let's Talk

Business Platform

Starting at

€6000

Digitize your internal processes with a platform tailored to your business operations.

Included

  • User management
  • Custom workflows
  • Reporting & dashboards
  • Data centralization
  • API integrations
Start Your Project
Scalable solution

SaaS MVP

Starting at

€8000

Launch your SaaS product on a modern, scalable architecture built for growth.

Included

  • Authentication
  • Subscription management
  • Stripe integration
  • Admin dashboard
  • Business API
  • Cloud deployment
Launch My SaaS

Team Extension

Starting at

Pricing on Request

Short-term or long-term support to strengthen your product and engineering teams.

Included

  • Next.js development
  • NestJS development
  • Feature implementation
  • Technical consulting
  • Long-term collaboration
Contact Me

Need Something Different?

Some projects require a tailored approach. Custom quotes are available based on your goals, budget, and technical requirements.

Request a Custom Quote
Contact

Let's Build Something Great

Tell me about your project, goals, and challenges. I'll get back to you within one business day with recommendations and next steps.

  • +33 6 58 95 92 51
  • linkedin.com/in/julien-wagentrutz
  • Lisbon, Portugal