Software engineer, cross-platform architect & tech founder.
Passionate about software craftsmanship for over 12 years, I have architected and deployed over 100 production mobile and web applications, serving more than 2 million cumulative active users.
As an internationally recognized Ionic Developer Expert (IDE), I focus on mission-critical cross-platform engineering (Capacitor 8, Swift, Kotlin, React, Next.js) and tackle complex challenges: offline-first bidirectional synchronization, proprietary native bridges, runtime memory leak resolution, and rigorous Apple App Store / Google Play compliance.
Alongside my independent consulting engagements, I run Kerweb agency to deliver end-to-end digital projects with a dedicated engineering team.
Modern, production-proven technologies.
A strictly curated toolchain engineered for performance, long-term maintainability, and resilience.
Frontend & Web
App Router, Server Components, SSR
Strict typing, Advanced Generics
Design systems, Responsive, A11y
Maintenance & legacy migrations
Mobile & Cross-Platform
Certified Ionic Developer Expert (IDE)
Native plugins, StoreKit 2, Widgets
Android 16 / Target SDK 36
SQLite, WatermelonDB, CRDT sync
Architecture & Backend
High-throughput APIs & microservices
Auth, Firestore, PostgreSQL, Edge Functions, Realtime
Query optimization, Caching
GitHub Actions, Appflow, Fastlane
Ionic Developer Expert (IDE) Certification
Global distinction awarded to leaders in the Capacitor & Ionic ecosystem for native bridge craftsmanship and high-performance cross-platform system architecture.
Freelance vs Agency: What is the right model for you?
As Founder & CTO of **Kerweb agency**, I also lead full turnkey digital projects (UX/UI design, native mobile engineering, App Store compliance, and 24/7 SLA maintenance).
Hire Me as Independent Consultant
Julien Kermarec • Advisory & Lead DevIdeal when you already have an engineering team or need immediate surgical senior reinforcement.
Entrust your project to Kerweb
Turnkey Web & Mobile AgencyIdeal if you need a multidisciplinary team (UI/UX designers, iOS & Android native engineers, QA) managed by me.