Kawika Miller

Highlights[ 05 ]

• Rolled Cloudflare Turnstile across four surfaces (80K+ challenges/month) with hostname checks, action binding and render-on-click.
• Replaced a fixed-bucket SMS rate limiter with a fail-closed sliding-window log after showing bursts slipped through at window boundaries; it rejects 2,000+ requests/month.
• Diagnosed that DynamoDB TTL only guarantees eventual deletion, so a TTL-based counter reset is not a real reset, and keyed limits by user and phone number instead.
• Hardened JWT session handling, and implemented a feature-flag kill switch for one feature so it can be turned off without a deploy.
• Wrote up my own multi-day rollout, including the reverts and hotfixes, so the team could learn from it.

Highlights[ 05 ]

• Each shipped with its own Terraform, CI, API Gateway wiring, message-broker contracts, migrations and first features.
• The messaging service is built on Twilio, with webhook signatures validated against the configured public URL rather than the request host.
• The AI services shipped human-in-the-loop features with audit logging.
• New capabilities rolled out behind fail-closed feature flags with a proven off-state.
• Wrote the guide for standing up a new backend microservice from a template repo.

Highlights[ 04 ]

• Implemented a token-based SSO flow: bearer-token session establishment and identity handoff between partner and platform.
• Moved credentials off hardcoded values into an encrypted store with a settings UI and a cron-callable endpoint.
• Kept medication, allergy and notification state in sync in both directions across three services and a Lambda proxy.
• Wrote the architecture page up front and a full knowledge-transfer guide when ownership moved teams.

Highlights[ 03 ]

• Built the permission model (join tables, soft-toggle semantics, security-group filtering) on the report listing and embed-token endpoints.
• Shipped a dynamic, API-driven reports sidebar and the matching admin UI, backend and frontend together.
• Documented the embed licensing model, RLS and token flow for a non-specialist audience.

Highlights[ 04 ]

• Wrote four sprint reports that became the team's evidence base for AI-assisted engineering, covering where it helped and where it fell short.
• Diagnosed an apparent gap in AI-usage metrics as a tooling configuration issue (a missing commit trailer) rather than low usage, and recommended the fix instead of drawing the wrong conclusion.
• When two AI-assisted work sessions reached contradictory conclusions on a feature, wrote a reconciliation document instead of picking a side.
• Owned an AI automation initiative end to end (2 epics, 40+ tickets), built on n8n.

Highlights[ 06 ]

• Stack: .NET microservices, Kafka, self-hosted Kubernetes and Keycloak federated identity with per-client white-labeling.
• Configured Keycloak as a WebAuthn relying party using an NFC, FIDO2-certified fingerprint card, and mapped the authenticated identity into multi-tenant roles with the platform's own RBAC.
• Built platform-wide RBAC and location-based access control, with a Google Maps geofencing UI supporting radial and custom-polygon boundaries.
• Built BLE and NFC proximity authentication: signal-strength auto-lock, secure device-token pairing, passwordless desktop login.
• Wrote roughly a quarter to a half of the React Native / Expo frontend, which served desktop admins and field users from shared components.
• Built a natural-language assistant over platform data using tool calling (Azure AI and OpenAI) with audit logging, and authored the generic Entity Framework base package used by all nine services.