Elfege Arthur Leylavergne

Experience

Senior Software Engineer — Mindhop Inc., White Plains, NY | 2023 – March 2026

Over Height Vehicle Detection — Real-Time Safety System for NYSDOT

Sole architect of production-grade edge safety system integrating LiDAR, VCA cameras, and automated traffic control. Fault-isolated multi-process architecture (5 processors + Flask) in single Docker container with 7-layer watchdog; 120+ days continuous field uptime.
Dual-sensor correlation (LiDAR + VCA) with confidence-plateau detection: reduced 18 duplicate detections to 1 optimal output. MQTT/WebSocket distribution to TMC dashboards; AVRO pipeline via Apache NiFi.
Automated field installer handling encryption, hardware integration (LiDAR, PTZ, SNMP relays), and systemd — non-technical staff run installs from a runbook.

DMS Control API — Highway Dynamic Message Sign Command & Control

Sole architect. Reverse-engineered NTCIP-1203 from raw MIB specs into a vendor-agnostic driver framework — no SDK, no vendor support. Factory/registry pattern, 4-gate request router, 3-tier quirk resolution.
Full NTCIP-1203 lifecycle: MULTI markup validation, CRC computation, activation/readback, scheduled messages via APScheduler. 31 end-to-end tests; Kafka event streaming.

Device Status Monitoring System — UDOT Network Infrastructure

16,000+ devices across 750+ subnets on state fiber. 90%+ cycle-time reduction (54 min → 5 min) via asyncio/aiohttp with 2,000 concurrent pings + adaptive batching.
APScheduler-based per-device-group scheduling (12/24/48 min cycles, 100% adherence); PostgREST streaming writes; Docker Compose with AWS (ECR, Secrets Manager, SSO).

SAM — Real-Time Alert Routing System

Event-driven alert routing on Apache Flink + Kafka; PostgreSQL stored procedures; modular SMTP/Twilio dispatch.

DVS — Video-Streaming Platform

Flask + FFmpeg encoding with WebRTC/HLS delivery; React monitoring UI for stream health.

Front-End contributions — DotStream React/Next.js Monorepo

Integrated full OHVD real-time subsystem into Next.js 15 / React 19 / TypeScript monorepo: alert providers, WebSocket event streams, map panel hierarchies, Kendo data grids. Contributed to 5,000+ line vanilla JS monolith → modular React migration (Jest + Playwright).

Engineering Methodology & DevOps — Linux/DevOps reference

Helped drive Mindhop's move to modern engineering practice: Flyway-managed PostgreSQL migrations on the 24-schema dotstream platform (authored 22+ versioned migrations signed "Author: Elfege"); docker-compose orchestration; docker swarm. Served as the team's Linux expert across infrastructure, deployment, and shell-tooling questions.

Adjunct Professor, Introduction to Logic — Dominican University New York | one semester, concurrent with Mindhop

Taught one evening class for a semester while engineering full-time at Mindhop. Formal logic is the foundation of programming language theory, type systems, and the kind of structural reasoning that production distributed systems demand — the teaching and the engineering reinforce each other rather than compete.

Software Engineer — PowerYou AI, New York, NY | 2022

Probono engagement to help a friend's startup whose React.js + React Native codebase was in critical condition after the prior team's abrupt departure. Stabilized both apps, hardened AWS (IAM least-privilege, S3 backups), transitioned ad-hoc config to documented state.

Professor, Researcher & Technology Integrator — Lycée Français of New York | 2007 – 2022

Technology Integrator (2012–2016): contributed to a $100M+ K-12 institution's technology modernization — faculty training, classroom digital integration, and hand-built pedagogical web tools. Ran a year-long one-to-one teacher mentorship: followed colleagues through the year, observed classes, advised on tech-for-pedagogy and tech-for-self-development.
Founded the Robotics program (2015–2022): C++ firmware, hands-on hardware curriculum.
Founded Polysophia research collective (2009–2022): coordinated with Columbia University, Rockefeller University, Nassau Community College, TED-Ed (2014).

IT Administrator & Operations Manager — Teleperformance, Strasbourg, France | 1999 – 2001

Sole IT admin + operations lead during full infrastructure modernization (Novell→Windows NT/LDAP/IIS, IPX/SPX→TCP/IP with 500% throughput gain, dBASE→MySQL with web reporting). Managed 20+ person team; 20% productivity / 10% profit gain. Worked while finishing my Bachelor's full-time.

Open-Source Developer | 2012 – Present

Anamnesis — vector-based episodic memory for AI instances. FastAPI + MongoDB Atlas Local $vectorSearch (HNSW, 1024-dim); multi-model embedding pipeline with auto re-embedding; cross-instance file crawler; three LLM backends (Ollama, Claude CLI/API). Production daily across 20+ Claude Code instances over 4 machines; designed read-attestation ACK gates and a file-ownership protocol for the multi-agent message bus (ICV2) coordinating those instances — now enforced fleet-wide.
Open-source job-application agent — FastAPI + Next.js 15 + Postgres + Chrome MV3 extension. RAG over personal context, Claude CLI orchestration, Chrome Debugger Protocol form-filling (required reverse-engineering react-select internals), nightly APScheduler pipeline ingesting Greenhouse + non-profit boards.
MOBIUS.NVR — multi-vendor video surveillance: 17+ IP cameras across 4 vendors (Python/Flask/Docker), ONVIF/WebRTC/MediaMTX at 200ms latency; Neolink bridging for non-ONVIF devices.
MOBIUS.SMART_HOME automation platform — Python/PostgreSQL multi-instance framework running 7+ production automation apps (motion lighting, fan control, breaker/power protection, screen-time enforcement, Sonos local TTS, a declarative rules engine, humidifier control). Migrated a live Matter smart-home controller off a failing custom implementation to matter.js-server after root-causing 100% command divergence to an upstream library bug; re-architected device-state reads onto an event-log source of truth after a stuck sensor had pinned a room "active" for 30 days (55 unit tests green); directed a 5-agent audit across the platform that shipped a same-day, severity-ranked remediation wave.
Embedded robotics & home-automation framework — C++ on ESP32/ESP8266/Arduino. 200+ devices on custom firmware I wrote on both ends (no vendor cloud), surfaced simultaneously to HomeKit, Hubitat, SmartThings, Alexa. Closed-loop PID with encoder feedback, inverse kinematics, on-device HTTP servers; one platform fully firmware-replaced via logic-analyzer UART decode.
Roomba 980 community integration — Node.js bridge on the Dorita library; first community SmartThings driver in Groovy, later ported to Hubitat. Subsequently forked and extended by other developers.
Linux homelab — Proxmox on Dell R730xd; 20+ self-hosted services managed entirely via Bash automation. Ubiquiti network stack, VLAN segmentation across 8 zones. Open-source ~/.bash_utils: AWS SSO chains, SSH ProxyJump across 5 machines, PDF pipeline, Docker lifecycle.

Profile

Core Competencies