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
Where I go deepest — services that carry the business.
NestJSNode.jsExpress.jsREST API DesignMicroservicesAuthentication & AuthorizationOAuth 2.0JWTBackground JobsFile ProcessingWorker Pool / ConcurrencyError Handling & LoggingWebhook HandlingExternal API Integration
Frontend Engineering
Production frontends for the systems I build — dashboards, admin tools, operational UIs.
Database & Performance
Where most production pain actually lives.
MongoDBPostgreSQLMySQLMongooseAggregation PipelineIndex DesignSharding ConceptsBulk WriteQuery OptimizationLarge Data ProcessingReporting Workloads
Infrastructure & DevOps
From Dockerfile to rollout — and back, when a rollout goes wrong.
DockerKubernetesNGINX IngressGitHub ActionsConfigMap / SecretTLS / Certificate HandlingCI/CDDeployment PlanningProduction Operations
Architecture & Leadership
The part of the job that doesn't show up in code.
Requirement BreakdownArchitecture DecisionTechnical PlanningCode ReviewDeveloper InterviewingProduction Issue AnalysisConsulting MindsetSystem DesignTrade-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.