# Case studies

> Case studies by Simas Razinskas: an AI support agent, an internal automation platform and an in-app AI assistant, with the engineering in full.

Source: https://simasrazinskas.com/work

Write-ups of systems I built and run. Client names stay private; the engineering is shown in full.

- [A supervised AI support agent grounded in real customer data](https://simasrazinskas.com/work/ai-customer-support-agent): Support staff approve ready-made replies instead of writing every answer from scratch. (Stack: TypeScript · Effect · Vercel AI SDK · Postgres · BigQuery · Hono · React · Zendesk API)
- [One governed platform for a company's internal AI automation](https://simasrazinskas.com/work/internal-ai-platform): New internal AI tools launch on one shared, access-controlled platform, not from scratch. (Stack: Next.js · tRPC · Prisma · Go · Postgres · BigQuery · Prometheus · n8n)
- [One AI chat assistant service for several brand apps](https://simasrazinskas.com/work/in-app-ai-assistant): Several apps share one AI chat assistant, and an LLM judge reviews every conversation. (Stack: TypeScript · Fastify · Postgres / Drizzle · Redis / BullMQ · Vercel AI SDK · n8n · Next.js · Docker)
- [Help-desk ingestion that proves nothing went missing](https://simasrazinskas.com/work/idempotent-webhook-ingestion): Every support ticket reaches the database; missing ones are found and repaired automatically. (Stack: Go · Postgres · Zendesk API · Prometheus · Slack)
- [One job queue instead of five ways to pick up work](https://simasrazinskas.com/work/durable-job-queue): Background work survives deploys and crashes, and retries no longer repeat customer-facing actions. (Stack: TypeScript · Go · Postgres · LISTEN/NOTIFY · BigQuery · Zendesk API · n8n)
- [An auditable AI fact-check of an exhibition wall text](https://simasrazinskas.com/work/ai-fact-checking-pipeline): 441 paragraphs fact-checked with sources and returned the same afternoon. (Stack: AI research agents · Python · python-docx · LibreOffice · SHA-256 · JSON · CSV · HTML)
- [An issue tracker shared by people and coding agents](https://simasrazinskas.com/work/agent-issue-tracker) (Own product): People and coding agents work from one issue list without overwriting each other. (Stack: C# · .NET 10 · ASP.NET Core Razor Pages · EF Core · SQLite · SignalR · System.CommandLine · Docker)

## Start with one process

A one-hour call costs €80. Afterwards you get a written plan, whether or not we work together.

[Book a call](https://simasrazinskas.com/book-me) · [simas@simasrazinskas.com](mailto:simas@simasrazinskas.com)