Professional_Profile
Building
What Doesn't Exist.
I'm Rahmouni Oussama — Senior Node.js & TypeScript Engineer with 3+ years building production APIs, data intelligence pipelines, and autonomous extraction systems. I work across the full technical stack: from HTTP protocol internals and TLS fingerprinting to distributed data pipelines and cloud infrastructure. When I'm not engineering production systems at Databiz, I'm building tools that access data others can't reach and teaching backend architecture to the next generation of developers.
Technical_Specialization
Engineering Depth.
Backend_Platform
- Node.js & TypeScript (strict)
- NestJS & Event-Driven Architecture
- WebSockets & Real-Time APIs
- REST, GraphQL & Custom Protocols
- PostgreSQL, Redis & MongoDB
Data_Intelligence
- Large-Scale Web Extraction
- HTTP Internals & TLS Fingerprinting
- Behavioral Anti-Detection Engines
- Multi-Market Data Pipelines
- Mobile API Reverse Engineering
Cloud_&_Infrastructure
- AWS (EC2, S3, RDS, CloudFront)
- Docker & Containerized Services
- GitHub Actions CI/CD
- Linux Server Administration
- Nginx & Process Management
Security_&_Systems
- Proxy Networks & Rotation Systems
- Protocol Engineering (MTProto, WA)
- Frida & Dynamic App Instrumentation
- Offensive Security Tooling
- WAF Bypass & TLS Probing
Engineering_Philosophy
How I Build.
Systems should own their own complexity — if you need a diagram to explain the control flow, the code is wrong
Real expertise is knowing which layer a problem belongs to: network, protocol, application, or data
Anti-patterns in the wild are a roadmap — once you can break a system, you understand how to build its replacement
The ungettable data is the most valuable — solve the access problem first, the storage problem is solved
Professional
Journey.
Building increasingly complex systems — from API platforms to autonomous intelligence pipelines — while driving technical excellence and mentoring teams.
2024 – Present
Senior Node.js / TypeScript Engineer @ Databiz
- Design and maintain production-grade TypeScript APIs with strict typing, domain-driven architecture, and full test coverage
- Lead backend decisions on service decomposition, data modeling, and API contract design across cross-functional teams
- Optimize high-throughput endpoints and reduce query latency through caching strategies and query plan analysis
- Introduce and enforce TypeScript best practices (strict mode, ESM modules, discriminated unions) across the engineering org
- Collaborate on system design for features requiring real-time data consistency and event-driven coordination
2025 – Present
Founder & Platform Engineer @ RAHMOUNIDEV LLC
- Designed and deployed a multi-market automotive data intelligence pipeline covering 5+ EU markets with behavioral anti-detection and proxy rotation
- Built autonomous extraction systems that reverse-engineer mobile APIs (Frida, APK analysis) and output normalized, deduplicated datasets
- Architected event-driven backend services with NestJS, TypeORM, and PostgreSQL for SaaS product billing and real-time user dashboards
- Implemented CI/CD pipelines with GitHub Actions, automated testing with Jest, and production observability across deployed services
- Integrated Stripe subscriptions, webhook handlers, and payment flows end-to-end for commercial SaaS products
06-2022 – 06-2025
Full-Stack Developer & Technical Consultant @ Apprentus (International Clients)
- Built and maintained full-stack web applications using React, Node.js, Express, MongoDB, and MySQL for international clients
- Improved frontend performance by 40% through code splitting, caching strategies, and rendering optimization
- Developed Stripe-powered e-commerce and payment flows for high-volume transactional systems
- Designed and operated RESTful APIs handling financial transactions across multiple client deployments
- Mentored junior developers on clean architecture, testing discipline, and backend patterns
06-2025 – 10-2025
Full-Stack Engineer — CI/CD & Automation (contractual) @ DEF TUNISIE
- Built end-to-end CI/CD pipelines for Salesforce using GitHub Actions, SF CLI, Bash, and Node.js scripting
- Reduced deployment time from 4 hours to 45 minutes through automated metadata workflows and environment promotion scripts
- Eliminated environment drift across dev, UAT, and production with fully scripted, repeatable deployment processes
11-2025 – Present
AI/ML & Software Engineering Mentor @ Masterclass Denden
- Teach backend architecture, event-driven systems, and cloud deployment to remote students from first principles
- Build educational prototypes demonstrating AI-driven backends with NestJS, Python tooling, and OpenAI APIs
- Run applied sessions on Docker, AWS, and CI/CD workflows using production-style deployments as learning vehicles
01-2022 – 10-2025
Full-Stack Engineering Mentor @ Masterclass Denden
- Taught MERN stack (MongoDB, Express, React, Node.js) to 30+ students across multiple cohorts
- Covered Git workflows, REST API design, authentication patterns, database modeling, and cloud deployment
Technical_Projects
Building Systems.
Automotive Data Intelligence Pipeline
Multi-market extraction system covering 5+ EU automotive platforms with behavioral mimicry, proxy rotation, and TLS fingerprinting to bypass anti-bot defenses at scale
Extracts and normalizes listings across Ireland, Romania, France, Greece, and Hungary into a unified EUR-denominated dataset with deduplication
Mobile API Reverse Engineering Toolkit
Dynamic instrumentation pipeline using Frida to intercept and reconstruct undocumented mobile APIs from Flutter and native Android apps without source access
Reduced API discovery time from days to hours — used to bootstrap production crawlers from scratch against closed mobile platforms
Proxy-Aware HTTP Infrastructure
Custom HTTP layer wrapping node-tls-client with browser-grade TLS fingerprinting, UA rotation, jitter injection, and automatic proxy resolution across Tor and SOCKS5 networks
Unified proxy and fingerprint management across 10+ scanner and crawler modules — single abstraction replacing raw fetch across the entire platform
Event-Driven SaaS Backend
Subscription platform with real-time user dashboards, Stripe billing webhooks, and automated provisioning — built on NestJS with full CI/CD from day one
Full billing lifecycle — trial, upgrade, downgrade, cancellation — handled end-to-end via webhook-driven state machines with zero manual intervention
Bachelor in Computer Science & Multimedia
ISAMM University • 2018 – 2021
Relevant Coursework
- Distributed Systems & Cloud Computing
- Database Theory & Advanced SQL
- Algorithms & Data Structures
AWS Certified Solutions Architect
Expected Completion: March 2026
Studying VPC design, multi-AZ deployments, IAM, and cost optimization patterns
Protocol & Systems Engineering
Self-directed deep dives into network internals
TLS handshake internals, HTTP/2, MTProto, binary protocol reverse engineering, and WAF evasion techniques
Offensive Security & Red Team Tooling
Applied security engineering through tool construction
Built production-grade scanners for SQLi, XSS, SSTI, CMDi, and CVE probing — understanding attacks through implementation