OPEN TO FULL-TIMESAN JOSE, CALIFORNIA

FULL-STACK AI ENGINEER

I design and ship AI products end to end: autonomous agents, agentic workflows, RAG pipelines and the LLM infrastructure underneath.

About

A full-stack engineer who builds the AI layer: agents, agentic workflows, and the infrastructure that runs them.

I work across the entire stack, React and Next.js up front with FastAPI, Node and Postgres behind, and specialize in what sits on top: autonomous agents, agentic workflows, RAG pipelines and multi-model orchestration, plus the billing, queueing and eval plumbing that makes them production-real.

Right now that’s Janusly, the AI marketing platform I’m building and selling direct to consumers as founding engineer.

Kevin Cui
LOCATIONSan Jose, California
STATUSOpen to full-time
EDUCATIONB.S. Data Science · SJSU · Dec 2025

Experience

APR 2026 — PRESENT

Founding Engineer

Janusly · San Jose, CA

  • Built and operate Janusly, a live AI platform that helps creators and small businesses turn trending short-form videos into finished, ready-to-post ads. It began as a hackathon finalist, then I rebuilt it from the ground up to serve real, paying customers.
  • Designed the full product from idea to finished ad: surfacing what is trending across the major short-form platforms, turning any video into a complete ad concept through an AI agent, and generating the images and video to produce it, all in one place.
  • Built the AI generation engine that creates images and video through several AI models, with automatic recovery when a job fails so users reliably get a finished result instead of a dead end.
  • Engineered a credit-based billing system that charges only for successful work, refunds failed jobs automatically, and is protected against duplicate charges, keeping revenue and customer trust accurate.
  • Kept the platform fast and dependable as usage grew, using caching and performance work to protect response times and control the cost of the AI services running behind the product.
  • Owned every layer of the product, from the creative tools and AI systems to billing, customer plans, and the internal dashboards that track cost against revenue.

MAY — AUG 2025

Full-stack SWE Intern

VTN Manufacturing, Inc. · San Jose, CA

  • Designed and built a CNC performance analytics dashboard from zero with React, Node, Express and PostgreSQL, tracking runtime, downtime, defects and performance from JSON logs.
  • Engineered a 5+ year historical ingestion pipeline, normalizing machine-generated logs into structured analytics records.
  • Improved reporting accuracy enough to flag ~10% revenue leaks the finance team hadn't seen.
  • Replaced manual spreadsheets with real-time dashboards, saving ~6 hours/week in reporting.

Education

B.S. Data Science

San Jose State University · San Jose, CA

AUG 2023 — DEC 2025

COURSEWORK

Data Structures & AlgorithmsAdvanced PythonData VisualizationDatabase Management SystemsR ProgrammingMachine LearningArtificial IntelligenceInformation SecurityProbability & Statistics I & II

ASSOCIATIONS

MESAStanford Science GroupsISPESASE

Stack

A/ LANGUAGES

PythonTypeScriptJavaScriptSQLRBash

B/ FRONTEND

ReactNext.jsThree.jsTailwindshadcn/uiVite

C/ BACKEND / DATA

FastAPINode / ExpressPostgreSQLDrizzle · SupabaseRedis · StripeGCP

D/ AI / ML

PyTorchTensorFlowscikit-learnHF TransformersVercel AI SDKVAPI · ElevenLabs

Selected Work

CASE 01/02 · FLAGSHIP · SINCE APR 2026 · SOLO

Janusly

An AI marketing platform, built and sold direct to consumers. Around 67k lines across a 30-table Postgres schema, credit-ledger billing on idempotent Stripe webhooks, and a unified render queue that debits at enqueue and refunds on failure. It scrapes TikTok, Reels and Shorts trends, turns them into on-brand scripts, and generates AI video across a dozen image and video models.

Next.jsTypeScriptDrizzleSupabaseStripeRedis

CASE 02/02 · JUL 2026 · SOLO

Proofjury

A correctness gate for AI-written code. It wraps your deploy command and only lets it run once deterministic checks pass: missing env vars, unrun tests, hardcoded secrets, pending migrations, each with file-and-line proof. Every diagnosis is logged to memory, so the same failure is caught instantly next time. Backed by around 360 tests.

PythonTyperpytestClaude Code

Projects

Preflight

Preflight

JUL 2026 · HACKWITHBAY 3.0, SOLO IN A DAY

A deploy-review agent that traverses a Neo4j code property graph, checking blast radius, load-bearing hubs and missing prod env vars, then runs your tests in a sandbox for real evidence.

PYTHON · FASTAPI · NEO4J · DAYTONA

Parallax

Parallax

JUN 2026 · 4-HOUR HACKATHON SPRINT

Upload a product photo and an agent turns it into an interactive exploded-parts 3D diagram it drives itself, through a strict Pydantic-validated action protocol: explode, highlight, isolate, focus.

FASTAPI · THREE.JS · PYDANTIC · GMI CLOUD

kyujin

kyujin

MAY — JUN 2026 · SOLO

Gmail-native job-application tracker. A hybrid classifier sorts application, interview, rejection and offer email before spending an LLM call. Web plus native iOS, dual Stripe/Apple billing.

NEXT.JS · DRIZZLE · SUPABASE · GEMINI · SWIFTUI

preprod-checkPUBLISHED CLAUDE CODE SKILL

preprod-check

JUN 2026 · PUBLISHED SKILL

A Claude Code skill that audits a codebase for production readiness across 14 categories — auth, injection, billing, rate limits, SSRF, secrets — and returns a severity-ranked report with drafted patches.

CLAUDE CODE · PLUGIN · SECURITY

cost-analysisPUBLISHED CLAUDE CODE SKILL

cost-analysis

JUN 2026 · PUBLISHED SKILL

A Claude Code skill that inventories every paid API, SDK and service in a project, attaches per-unit rates, and computes per-plan margins — flagging the paths that quietly lose money.

CLAUDE CODE · PLUGIN · FINOPS

Reunion

Reunion

JUN 2026 · AGENTIC AI SF, 6-PERSON

An iMessage-native group-travel agent that reads travel intent from a group chat and drafts a plan. An on-device gate classifies messages locally with Apple Foundation Models — nothing leaves the Mac.

TYPESCRIPT · NEXT.JS · APPLE FM · SWIFT

Tutor Me

Tutor Me

APR 2026

A browser-based social AI classroom. Learners share a live 3D space with persona tutors grounded in web research, backed by pgvector memory and a semantic cache.

NEXT.JS · REACT THREE FIBER · PARTYKIT · VAPI · PGVECTOR

MiniMed

MiniMed

APR 2026

Plain-language medical guidance as a seven-phase intake state machine, each step constrained by its own JSON schema, ending in a four-level care recommendation. Voice in and out via ElevenLabs.

NEXT.JS · MINIMAX · ELEVENLABS

Next Boba

Next Boba

MAR — APR 2026

Search a phrase like “matcha” and rank Bay Area boba shops by sentiment. Built on a RoBERTa classifier fine-tuned on the ~5 GB Yelp dataset, run across millions of reviews via a streaming ETL.

PYTORCH · ROBERTA · FASTAPI · SUPABASE

Pokémon Predictor

Pokémon Predictor

JAN — MAY 2025 · 4-PERSON TEAM

A competitive-metagame study built with a four-person team. Python pipelines scrape Smogon usage stats across three annual snapshots, feeding a Random Forest that recommends the best move for a matchup.

PYTHON · SCIKIT-LEARN · DASH · GCP

07 // CONTACT — SYS.READY

Have a need?Let’s build the answer.

KEVINCUI1034@GMAIL.COM →