Abderrahmen
Sfayhi
Full-Stack Engineer
Available for freelance & contract workAbout Me
Full-Stack Engineer passionate about building products that make a difference
I build AI-powered platforms and distributed systems that serve thousands of users. From architecting event-driven pipelines to contributing to open-source projects with 700+ GitHub stars, I focus on delivering scalable, production-ready solutions.
Currently at Navero, I'm leading a multi-region architecture migration and building AI-driven hiring workflows. Previously, I contributed to Hexabot (adopted by major telecom providers) and built a real-time collaborative editor supporting 50+ concurrent users.
GitHub Stars Earned
P99 Latency Reduction
Concurrent Users Served
Languages
Frontend
Backend
Cloud & DevOps
Databases
What I Can Do For You
I help startups and teams build, scale, and ship faster
Full-Stack Product Development
End-to-end web applications from idea to production. React, Next.js, and Node.js with clean architecture that your team can maintain.
API & Backend Architecture
Event-driven systems, microservices, and real-time APIs built to handle thousands of concurrent users reliably.
Performance & Scaling
Profiling, caching strategies, and infrastructure optimization. I've cut P99 latencies by 98% and database loads by 40%.
AI Integration
LLM-powered features, automated pipelines, and intelligent workflows integrated into your existing product.
Experience
Building scalable products at startups and open-source projects
Navero
May 2025 - PresentFull-Stack Engineer
Remote / Dubai
AI-powered hiring platform automating candidate evaluation.
- Leading V2 multi-region architecture migration with data residency and regional isolation (GDPR, KSA, UAE markets)
- Reduced dashboard P99 latency from 60s to 1s (98% improvement) by redesigning data access strategies
- Designed event-driven video screening system with async transcription automating AI-powered analysis
Hexastack
Nov 2024 - May 2025Software Engineer
Tunis, Tunisia
Open-source chatbot builder adopted by major telecom providers.
- Contributed to Hexabot OSS (700+ GitHub stars), adopted by major Tunisian telecom providers
- Designed Zookeeper-based leader election enabling safe horizontal scaling for distributed services
- Developed chat flow engine serving 500+ daily active users
Cynoia
Jan 2024 - Oct 2024Full Stack Engineer
Tunis, Tunisia
Real-time collaborative document editing platform.
- Engineered CRDT-based collaborative editor supporting 50+ concurrent users with real-time sync
- Reduced database load by 40% with multi-layer Redis caching architecture
- Designed granular RBAC policies for document-level access control
Featured Projects
A selection of projects I've built and contributed to
What Teams Say
Results from the teams and projects I've worked with
“Abderrahmen took our dashboard from 60s load times to under 1 second. He doesn't just write code — he understands the business impact of technical decisions.”
Navero
AI Hiring Platform
“His contributions to Hexabot were critical to our adoption by major telecom providers. Exceptional understanding of distributed systems and event-driven architecture.”
Hexastack
Open-Source Chatbot Builder
“Built our real-time collaborative editor from the ground up — 50+ concurrent users with zero data conflicts. Delivered ahead of schedule.”
Cynoia
Collaborative Document Platform