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Skills & Expertise

Tech toolkit

A toolkit shaped by production constraints — tenant isolation, agent evals, and zero-downtime delivery — not a course list.
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8 Disciplines
Core Architecture Areas
AI agents, tenant isolation, Next.js, distributed APIs, databases, CI/CD
63 Skills
Production-Verified
Battle-tested across live commercial applications and open-source tooling
93%
Latency Reduction
Measured in production via streaming chunk pipelines & cache topologies
10K+
Daily Agent Inferences
Enterprise LLM tool-calling throughput in multi-tenant environments
Agentic AI8 Skills

Agentic AI & Non-Deterministic Systems

Architecting self-correcting agent workflows, function-calling state machines, duplex WebRTC voice streaming, and hybrid vector/keyword retrieval pipelines.

Azure OpenAI (Responses & Realtime)2+ years
Core Mastery90%
LangChain2+ years
Production Scaled88%
RAG2+ years
Production Scaled88%
Agentic Tool-Calling2+ years
Core Mastery90%
pgvector1.5+ years
Production Scaled80%
Prompt Engineering2+ years
Production Scaled88%
Golden Evals1+ year
Production Scaled85%
Voice AI (Vapi / Realtime)1+ year
Production Scaled82%
Key Production Invariants & Guarantees
  • Zod runtime schema enforcement on all tool calling payloads with automated retry recovery.
  • Reciprocal Rank Fusion (k=60) hybrid search uniting pgvector HNSW cosine embeddings with PostgreSQL BM25 full-text rank.
  • Sub-800ms time-to-first-token streaming via Vercel AI SDK edge protocol chunking and SSE backpressure management.
Deployed in:RAG Starter KitNexus Voice AI
Isolation & platforms5 Skills

Multi-Tenant Isolation & Cloud Security

Engineering hardened multi-tenant foundations with PostgreSQL Row-Level Security, token rate limits, and network perimeter isolation.

Multi-Tenant SaaS1+ year
Core Mastery90%
Prisma + RLS2+ years
Production Scaled88%
Zero-Trust Networking1+ year
Production Scaled82%
Azure Front Door / APIM / VNet1+ year
Production Scaled82%
ARM1+ year
Production Scaled80%
Frontend9 Skills

Frontend Architecture & UI Engineering

Building high-performance client applications on Next.js 16 App Router, React 19 Server Components, and zero-leak Shadow DOM browser extensions.

React.js4+ years
Core Mastery95%
Next.js3+ years
Core Mastery92%
React Native2+ years
Applied & Validated78%
Redux Toolkit3+ years
Core Mastery90%
Recoil2+ years
Production Scaled82%
React Query2+ years
Production Scaled88%
Backend & APIs8 Skills

Distributed Backend & Real-Time APIs

Designing high-throughput asynchronous services, gRPC pipelines, ElysiaJS edge endpoints, and bidirectional WebSocket state synchronization.

Node.js4+ years
Core Mastery90%
NestJS2+ years
Production Scaled85%
Express.js4+ years
Core Mastery90%
Fastify2+ years
Production Scaled82%
GraphQL2+ years
Production Scaled85%
gRPC1+ year
Applied & Validated78%
Languages6 Skills

Polyglot Systems & Type Rigor

Runtime safety through strict TypeScript compilation, async Python data ingestion, and optimized SQL queries.

TypeScript4+ years
Core Mastery95%
JavaScript5+ years
Core Mastery95%
Python2+ years
Applied & Validated78%
SQL3+ years
Production Scaled85%
HTML55+ years
Core Mastery95%
CSS35+ years
Core Mastery95%
Databases & Cloud12 Skills

Databases, Vector Stores & Cloud Topology

Relational, document, and vector persistence layers tuned for transactional integrity, sub-50ms queries, and edge caching.

PostgreSQL3+ years
Production Scaled88%
SQL Server1+ year
Production Scaled82%
Azure (Container Apps, APIM, Front Door)1+ year
Production Scaled82%
MongoDB3+ years
Production Scaled85%
Redis2+ years
Production Scaled82%
Prisma2+ years
Production Scaled88%
Delivery10 Skills

Supply-Chain Security & High-Fidelity CI/CD

Reproducible hermetic testing, automated SBOM artifact signing, container vulnerability scanning, and zero-downtime blue-green deployments.

Vitest2+ years
Core Mastery90%
Jest3+ years
Production Scaled85%
Cypress2+ years
Production Scaled80%
Playwright2+ years
Production Scaled85%
React Testing Library3+ years
Production Scaled88%
GitHub Actions CI/CD3+ years
Production Scaled88%
Architecture6 Skills

Systems Architecture & Scalability Patterns

Decomposing complex enterprise domains into decoupled, event-driven microservices, browser extensions, and agentic workflows.

Microservices2+ years
Production Scaled82%
Micro-Frontends1+ year
Applied & Validated78%
Event-Driven Systems2+ years
Production Scaled80%
RAG / LLM Integration2+ years
Production Scaled88%
System Design3+ years
Production Scaled85%
MV3 Extensions2+ years
Production Scaled82%
Production Ecosystem

Curated DevTools & Platform Workbench

The daily verified toolchain powering local development, CI automation, and global edge delivery.

Developer Toolchain & Verification

Hermetic environments, fast feedback loops, and automated test runners

VS Code• Primary IDE
Git• Version Control
GitHub• CI/CD & Actions
Postman• API Debugging
Biome• Rust-Fast Linting
Vitest• Unit & Integration (564+ tests)
Playwright• E2E Browser Testing

Cloud Infrastructure & Edge Runtimes

Zero-cold-start hosting, serverless compute, and container orchestrations

Vercel• Edge Delivery & Next.js 16
Azure Container Apps• Microservices & APIM
AWS (EC2 / S3 / Lambda)• Object Storage & Compute
Docker• Hermetic Container Builds
Kubernetes• Pod Orchestration
Nginx• Reverse Proxy & TLS

Databases, Vector & Distributed Caching

Transactional databases, vector embeddings, and low-latency cache tiers

PostgreSQL 16• Primary Relational DB
pgvector• HNSW Vector Embeddings
Redis (Upstash)• L2 Cache & Rate Limiting
Prisma ORM• Type-Safe Client
Supabase• BaaS & Storage
MongoDB• Document Persistence

Observability, SaaS & Commerce

Production telemetry, recurring billing, and asynchronous queues

Stripe• SaaS Billing & Webhooks
OpenTelemetry• Tracing & Metrics
LogRocket• Session Replay
Inngest• Durable Background Functions
Ably• Realtime WebSocket Pub/Sub
Twilio• SMS & Telephony
Linear• Issue Tracking
Notion• Documentation
Open to staff-level rolesFull-stack / AI systems · Selective freelance

Architectural Leadership & Production Delivery

Full-stack and AI systems seats where I own architecture through production — tenant isolation, agent evals, and reproducible zero-downtime release paths.

Schedule Architectural ReviewExplore Client Engagements
rejisterjack

Full-stack engineer who owns production agentic systems — tenancy, tool-calling evals, and supply-chain-hardened delivery.

rejisterjack@gmail.com
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