Sagi Menahem - Independent Software Developer
Founder of AfterTech. I build production e-commerce, business systems and AI features — from requirements to launch and ongoing maintenance.
ABOUT
I am an independent software developer and the founder of AfterTech. I build production e-commerce platforms and admin tooling for paying clients, and develop LLM features such as a Hebrew-language support agent with hybrid vector and full-text retrieval and re-ranking. From real-time systems in Java to Hebrew RTL storefronts on Next.js and Supabase, my work includes payment integrations, custom CMS tools and production monitoring. I work directly with clients throughout development and ongoing maintenance. I am completing a B.Sc. in Computer Science at The Open University of Israel. This portfolio brings together my client, personal and academic work.
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.
The Backyard
One site and one admin replacing three WordPress sites for an events venue in Hod HaSharon with three spaces. The venue team edits every page, gallery and legal text through an area-based CMS with a resumable media library; every enquiry is stored, alerted over WhatsApp and delivered to the venue's CRM through a transactional queue that never retries blindly. The migration mapped 88 legacy URLs to 301s and 410s, verified live across three cut-over domains, with consent-gated analytics per venue. Hebrew, RTL-first.
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.
The Backyard
One site and one admin replacing three WordPress sites for an events venue in Hod HaSharon with three spaces. The venue team edits every page, gallery and legal text through an area-based CMS with a resumable media library; every enquiry is stored, alerted over WhatsApp and delivered to the venue's CRM through a transactional queue that never retries blindly. The migration mapped 88 legacy URLs to 301s and 410s, verified live across three cut-over domains, with consent-gated analytics per venue. Hebrew, RTL-first.
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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