01 · Expertise
A capability map, not a list of logos
What I can design, build, and operate — and which case study backs each row up.
Backend Engineering
The core of my work — services that carry the business.
NestJS Node.js Express.js REST API Design Microservices Authentication & Authorization OAuth 2.0 JWT Background Jobs File Processing Worker Pool / Concurrency Error Handling & Logging Webhook Handling External API Integration
Frontend Engineering
Enough to ship complete products — dashboards, admin tools, operational UIs.
Angular React Next.js TypeScript Enterprise Dashboard UI Form Validation API Integration Auth Guard SSR / SEO awareness Component-based UI
Database & Performance
Where most production pain actually lives.
MongoDB PostgreSQL MySQL Mongoose Aggregation Pipeline Index Design Sharding Concepts Bulk Write Query Optimization Large Data Processing Reporting Workloads
Infrastructure & DevOps
From Dockerfile to rollout — and back, when a rollout goes wrong.
Docker Kubernetes NGINX Ingress GitHub Actions ConfigMap / Secret TLS / Certificate Handling CI/CD Deployment Planning Production Operations
Architecture & Leadership
The part of the job that doesn't show up in code.
Requirement Breakdown Architecture Decision Technical Planning Code Review Developer Interviewing Production Issue Analysis Consulting Mindset System Design Trade-off Analysis
02 Capability matrix
Capability depth, with proof
Three levels: daily work, production experience, working knowledge. Each row links to the case study that backs it up.
| Capability | Depth | Proof |
|---|---|---|
| REST API & contract design | daily work | Smart Messaging Platform |
| Background jobs & scheduling | daily work | Smart Messaging Platform |
| MongoDB aggregation & index design | daily work | MongoDB Reporting Optimization |
| Third-party integration & OAuth 2.0 | production experience | E-commerce Order Consolidator |
| Webhook processing | production experience | E-commerce Order Consolidator |
| Kubernetes deployment & CI/CD | production experience | Smart Messaging Platform |
| Relational modeling (PostgreSQL / MySQL) | production experience | E-commerce Order Consolidator |
| Enterprise dashboards (Angular / React / Next.js) | production experience | E-commerce Order Consolidator |
| Sharding & horizontal scaling strategy | working knowledge | MongoDB Reporting Optimization |
daily work · production experience · working knowledge
Need this capability on your team or your project?
I take on backend builds, architecture reviews, and consulting engagements.