OWASP Top 10
Hands-on labs for SQLi, XSS, SSRF, IDOR, injection, and privilege escalation.
Senior Full-Stack Product Engineer
Youssef
Belhadj
Building production AI & SaaS systems from architecture to deployment. AI SaaS, ERP platforms, EdTech APIs, Flutter apps, and secure cloud infrastructure — owned end to end.
- 4+
- Years shipping production systems
- 70%
- Faster deployments via Docker CI/CD
- 40%
- Faster APIs on MTN Corporate Platform
- 36
- Prisma models in Hesabi ERP
Tunis · Available for senior product engineering roles
TypeScript · Next.js · Node · PostgreSQL · Flutter · AI
Selected work
Systems that shipped — with architecture, impact, and ownership.
Case studies across ERP, EdTech, AI platforms, founding engineering, hospitality, and D2C commerce — each with measurable product outcomes.
About
I ship complete products - not just layers.
I'm a Senior Full-Stack Product Engineer with 4+ years building production systems from architecture through deployment. My work spans AI-enabled SaaS, ERP/accounting platforms, school management APIs, mobile apps, fintech backends, and containerized cybersecurity training environments.
I think in product outcomes: who uses it, what must never break, what can be async, and how the system grows without becoming a museum of exceptions. That means backend architecture, database design, REST APIs, dashboards, mobile, AI integrations, Docker infrastructure, and security - owned as one story.
At Campusna I led architecture on scalable SaaS platforms, cut deployment time by 70% with Docker CI/CD, and improved API latency by 40% on a corporate platform. As Co-Founder at DarDev I pair product strategy with technical leadership - shipping systems teams can operate.
Product thinking
Every technical choice maps to a user or business constraint.
Scalability
Schemas, queues, and boundaries designed before the traffic arrives.
Developer experience
Typed APIs, tests, Compose stacks, and docs that make the next change safe.
Leadership
Technical lead energy: clarity, ownership, and delivery with distributed teams.
Security mindset
OWASP-aware design, RBAC, secrets hygiene, and auditability.
AI engineering
LLMs as product leverage - integrated, tested, and operationally sound.
Engineering ecosystem
Not a laundry list — a working system.
Frontend through infrastructure. Pick a layer to see how I build production products.
Frontend
Next.js 15/16React 19TypeScriptTailwindRadix UIshadcnGSAPFramer Motion
Engineering beyond code
Security, mobile, AI, and architecture — treated as product.
Security mindset
OWASP-aware delivery from auth to containers - informed by hands-on cybersecurity lab work across 22,000+ files of Dockerized training environments.
Authentication
JWT, session boundaries, token rotation patterns, and secure auth flows.
Authorization & RBAC
Role-aware APIs across school, ERP, and SaaS domains.
API Security
Rate limiting, signed URLs, input validation, and audit logs.
Docker Security
Multi-stage builds, least privilege, health checks, isolated networks.
Cloud Security
Secrets management, environment isolation, and hardened deploy posture.
Encryption
Crypto-aware services for tokens, sensitive fields, and transport trust.
Secure SDLC
Threat modeling mindset from architecture through tests and release.
Mobile
Flutter products with offline-first thinking, push, and adaptive UI - FitNerve and beyond.
Flutter
Cross-platform product apps with Riverpod state and production polish.
Android & iOS
One codebase shipping native-feel experiences on both platforms.
Offline-first
Local caching patterns so core flows survive flaky networks.
Push & realtime
Firebase messaging and WebSocket-ready architectures.
Adaptive UI
Responsive and adaptive layouts from phone to tablet.
AI engineering
LLMs integrated into recruitment, fitness, and business platforms - with vector-ready data and worker pipelines.
LLM Integration
OpenAI, Gemini, Claude - wired into real product workflows.
AI Workflows
Background jobs, plan generation, scoring, and automation pipelines.
Vector-ready data
PostgreSQL + pgvector for candidate scoring and retrieval paths.
RAG & embeddings
Architecture designed for retrieval-augmented product features.
Prompt engineering
Deterministic enough for production - measurable, testable outputs.
How I design systems
Microservices when isolation pays. Modular monoliths when speed does. Queues, caching, and Docker always in the conversation.
Start with the domain
Schema and boundaries follow the business - 36-model ERPs and 43-endpoint APIs exist for a reason.
Choose the shape deliberately
Modular monoliths when speed matters; workers and queues when the request path must stay fast; microservices when isolation earns its cost.
Async where it hurts
BullMQ/Celery workers for exports, notifications, email, and AI jobs - never block the user on heavy work.
Cache and store with intent
Redis for speed and queues; Postgres as source of truth; object storage for files with signed access.
Ship operable systems
Docker multi-stage builds, health checks, CI/CD, tests, and observability as part of the product - not afterthoughts.
Security is architecture
AuthN/AuthZ, rate limits, audit logs, and threat modeling belong in the first design pass.
Experience
Technical leadership with receipts.
Recent
Senior Full-Stack Engineer / Technical Lead
Campusna · Tunis, Tunisia
- Led architecture and implementation of scalable SaaS platforms with Node.js, Django, Next.js, and TypeScript.
- Reduced deployment time by 70% via Docker pipelines and automated CI/CD.
- Designed modular backends and REST APIs; integrated OpenAI and Claude-assisted workflows.
- Cut API response times by 40% on the MTN Corporate Platform through query optimization and refactoring.
- Collaborated with distributed Agile teams to ship production features on schedule.
Ongoing
Co-Founder · Engineering & Product
DarDev · Tunisia
- Own product strategy, architecture, and delivery across client and internal systems.
- Lead AI integration, automation, security posture, and cloud infrastructure decisions.
- Ship end-to-end: backend, frontend, mobile-ready surfaces, and deployment.
Earlier
IT Systems Support / Infrastructure
CSFMT · Hammam-Lif, Tunisia
- Managed IT infrastructure, network troubleshooting, backups, and monitoring scripts.
- Maintained hardware/software deployments and organizational technical support.
Education
Holberton School
Full-Stack Software Engineering
CSFMT
Advanced Technician Degree, Information Technology
Also shipped
FitNerve (AI fitness Flutter app), RhAI/EscaHire (AI recruitment with pgvector), PropClose (B2B sales automation), App4Drivers marketplace architecture, and a 22k+ file cybersecurity Docker lab portfolio - detailed on request and in the resume.
Contact
Let's build the next production system.
Open to Senior Full-Stack Product Engineer and founding-engineering conversations. Tunis-based, remote-friendly.
Coming soon
Engineering articles
Architecture deep-dives
Speaking & open source
Testimonials