Lester Echem — Fullstack Engineer, Designer & AI Orchestrator

[01] MAY 2026 — PRESENT NYC ↔ BARCELONA

PRODUCT / AI / INFRASTRUCTURE

Built and operate a multi-tenant platform that hands every non-technical customer an isolated container running a coding-agent session that builds, serves and iterates their application at a shareable URL — no repository, no terminal, no build step.
Architected the TypeScript/Express control plane so router mount order is the security boundary: default-deny gate, approval-gated accounts, and one ownership check every tenant route resolves through, with public traffic reverse-proxied ahead of the gate.
Authored the hardened non-root agent container image, its managed configuration re-synced on every boot, plus import paths that never touch control-plane disk.
Hold 110 test suites / 2,831 tests at 92% line coverage behind a hard threshold gate, on five runtime dependencies.

[02] FEB 2026 — PRESENT NYC ↔ BARCELONA

PRODUCT / UX / AGENTIC AI

Designed and run a 12-application TypeScript monorepo — roughly 967,000 lines over 167 PostgreSQL tables across 2,552 commits — behind a chat-first kitchen assistant covering recipe generation, pantry state, grocery planning and nutrition.
Built Mise, a LangGraph batch-orchestration service running long multi-model pipelines as resumable, observable jobs with cost accounting and per-item failure analysis.
Built Taster, an MCP-backed evaluation harness in which synthetic personas exercise the live product while deterministic gates and LLM judges score every run — driving a 506-run quality baseline and the merge gate.
Modelled a two-tier ingredient system — 315 canonical agent-facing slugs against 25,602 vendor SKUs — so agents can only name ingredients a customer can buy, and shipped carbon scoring across a 25,702-recipe catalogue.

[03] JUN 2020 — PRESENT NEW YORK & PHILIPPINES

CLIENT SYSTEMS / APPLIED AI

Built an LLM-based résumé parser that sifted candidates across several hiring databases for a recruitment agency, cutting search time per qualified applicant by 82%.
Built and deployed an AI image-generation platform on a locally hosted Stable Diffusion server, producing stock photography with custom poses and backgrounds.
Designed and built applications for clients across media training, real estate, insurance, medical and food — including a Vue 3 component library published through an automated CI-CD pipeline.

[04] JAN 2017 — SEP 2023 NEW YORK CITY

FORTUNE 100 / INSURANCE / PRODUCTION

Lead frontend developer on a new flagship term-life insurance application in Angular, TypeScript, Webpack and NGINX.
Rebuilt key landing pages to load ~12× faster to full load and ~40× faster to first meaningful paint.
Built an in-house eSign platform that lifted funnel conversion and cut signing time from ~4 minutes to ~2 — a projected $132,000 first-year saving.

[05] JAN 2016 — OCT 2016 NEW YORK CITY

HOSPITALITY / EDITORIAL / SPA

Lead developer on single-page applications in React, Flux, SASS and Webpack for luxury hotels and Michelin-starred restaurants.

[06] APR 2012 — MAR 2015 NEW YORK CITY

BRAND / E-COMMERCE / ART DIRECTION

Built an e-commerce cake store on Shopify that earned $1.8M in its first year.
Grew daily average visitors ~720% over three years through format, content, SEO and press placement.
Designed the tea-line packaging — Best Packaging Design Award, Graphic Design USA.