Pascal Kozlowski

Self-hosted semantic search over a document collection with source citation for each hit. Implemented completely locally and data-sparingly, without dependence on external services. Backend in Python, frontend in TypeScript, containerized with Docker. Prepared for AI integration that exclusively answers from documented sources, ensuring results remain traceable instead of hallucinating. Live demo and source code publicly available.

Fullstack web application with Angular 22 (Standalone Components, Reactive Forms, Signals, RxJS) and a NestJS/PostgreSQL backend. The core is a multi-stage, server-side enforced approval and application workflow (Draft, Submitted, In Review, Approved, Rejected), comparable to a digital administrative process. Role-based access for applicants, reviewers, and admins, a live status board via WebSocket, and an append-only audit trail. JWT authentication and a dedicated accessible area (WCAG/BITV-oriented). Live demo and source code publicly viewable.

Concept and complete development of a multi-tenant SaaS platform for a regulated B2B domain (Pre-launch, product name confidential). Backend in TypeScript with NestJS, cleanly layered according to Domain-Driven Design (Application, Domain, Infrastructure, Interface), plus Go for performance-critical services. Tenant isolation directly at the database level via PostgreSQL Row-Level Security and Vault-based per-tenant encryption, communication between services via gRPC with mTLS. Continuous PR reviews, ADRs, and a CI with lint, build, and test as a mandatory merge gate. Architecture walkthrough possible in conversation.