Sagi Menahem - Full Stack Developer
Building production e-commerce & SaaS end-to-end — AI-first: real payments, custom admin panels, Next.js + Supabase.
ABOUT
I build production e-commerce platforms and admin tooling for paying clients — and I build LLM features into them: a Hebrew-first support agent on hybrid vector + full-text retrieval with re-ranking, grounded to answer only from retrieved sources. From real-time systems in Java to Hebrew RTL storefronts on Next.js + Supabase with real payments, custom CMS, and Sentry monitoring, I ship software that holds up under real traffic — AI-assisted, under the same review and audit discipline as any other code. B.Sc. Computer Science at the Open University of Israel (final semester, graduating 2026) — open to Junior/Entry-Level positions.
WORK
A real-time collaborative whiteboard platform enabling teams to ideate together, no matter where they are.
Real-Time Collaboration
Draw, brainstorm, and create together in real-time. Every stroke syncs across all connected users over low-latency WebSocket delivery, creating a seamless collaborative experience.
Enterprise-Grade Architecture
Built with Spring Boot and STOMP protocol over ActiveMQ Artemis for reliable message delivery. Features offline resilience with automatic reconnection, message queuing, and optimistic UI updates.
Production-Ready Stack
Dockerized deployment with PostgreSQL, Nginx reverse proxy, and automated SSL. Features JWT authentication, Google OAuth2, email verification, and role-based permissions.
Other Projects
AfterTech Portal
A production client billing portal with a Hebrew-first RAG support agent, running the client side of the AfterTech agency. Retrieval fuses pgvector similarity with Postgres full-text ranking through Reciprocal Rank Fusion and an LLM reranker, so the agent answers only from retrieved knowledge and says so when it has none. One agent brain serves both a WhatsApp business line and a chat widget embedded cross-origin in the marketing site, with hosted-page payments and server-side idempotency on every money operation.
FBT Israel
A production Hebrew RTL + English e-commerce storefront for the official Israeli importer of FBT Elettronica, an Italian professional audio brand since 1963. Real Tranzila card payments with independent server-side re-verification before an order is ever marked paid, plus a custom admin CMS for the full catalog.
Synthetix
A mobile-first SaaS for running weekly pickup football nights, from attendance to a saved final score. Balanced squads are generated from private admin fairness ratings that never reach the client, with drag-and-drop squad swaps mid-game and a fully bilingual Hebrew/English UI.
AfterTech
A conversion-optimized web agency landing page for Israeli SMEs with a scroll-morph hero, Three.js particle background, dual contact flows, and an integrated accessibility menu. Built RTL-first as a fully static Next.js export with structured data for a perfect 100/100 SEO score.
Artist Portfolio
A full-stack site for an artist, rewritten from the ground up. The client edits every section himself through a CMS spanning eleven content areas; leads arrive with UTM attribution and reach him over WhatsApp; and the analytics count visitors without storing any PII — a visitor is a salted, day-rotating hash rather than an IP or a cookie. Hebrew, RTL-first, with an accessibility menu and a wall preview that shows a painting at true scale in a room.
Insurance Agent Demo
A demo landing page for an independent insurance agent with Hebrew RTL support, lead generation forms, and a comprehensive accessibility menu. Optimized for conversion with trust indicators and a multi-step consultation process.
System Assembler
A complex system programming project implementing a two-pass assembler in C. Handles dynamic memory allocation, symbol table management, and binary code generation for a custom CPU architecture.
AfterTech Portal
A production client billing portal with a Hebrew-first RAG support agent, running the client side of the AfterTech agency. Retrieval fuses pgvector similarity with Postgres full-text ranking through Reciprocal Rank Fusion and an LLM reranker, so the agent answers only from retrieved knowledge and says so when it has none. One agent brain serves both a WhatsApp business line and a chat widget embedded cross-origin in the marketing site, with hosted-page payments and server-side idempotency on every money operation.
FBT Israel
A production Hebrew RTL + English e-commerce storefront for the official Israeli importer of FBT Elettronica, an Italian professional audio brand since 1963. Real Tranzila card payments with independent server-side re-verification before an order is ever marked paid, plus a custom admin CMS for the full catalog.
Synthetix
A mobile-first SaaS for running weekly pickup football nights, from attendance to a saved final score. Balanced squads are generated from private admin fairness ratings that never reach the client, with drag-and-drop squad swaps mid-game and a fully bilingual Hebrew/English UI.
AfterTech
A conversion-optimized web agency landing page for Israeli SMEs with a scroll-morph hero, Three.js particle background, dual contact flows, and an integrated accessibility menu. Built RTL-first as a fully static Next.js export with structured data for a perfect 100/100 SEO score.
Artist Portfolio
A full-stack site for an artist, rewritten from the ground up. The client edits every section himself through a CMS spanning eleven content areas; leads arrive with UTM attribution and reach him over WhatsApp; and the analytics count visitors without storing any PII — a visitor is a salted, day-rotating hash rather than an IP or a cookie. Hebrew, RTL-first, with an accessibility menu and a wall preview that shows a painting at true scale in a room.
Insurance Agent Demo
A demo landing page for an independent insurance agent with Hebrew RTL support, lead generation forms, and a comprehensive accessibility menu. Optimized for conversion with trust indicators and a multi-step consultation process.
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SKILLS
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