Case Studies
Case Studies
Real-world projects showcasing architecture, AI/RAG systems, and product development across industries.
RAG Document Processing System
Building an intelligent document retrieval and question-answering system for insurance policy documents across multiple providers.
Challenge
Insurance brokers needed to quickly find relevant information across thousands of policy documents from 23 different insurers, each with unique formats and terminology.
Solution
- Built RAG system with hybrid search (Elasticsearch + Qdrant vector DB)
- Implemented Polish-optimized embeddings for semantic search
- Integrated AWS Bedrock and local Ollama for flexible LLM backends
Results
90%
Faster document lookup
25+
Projects managed in monorepo
23
Insurers integrated via Calcly
Tech Stack
Fleet Analytics & Driver Planning Platform
Data engineering pipeline with anomaly detection, driver-vehicle scheduling optimization, and integration with internal backoffice for a logistics company managing 300+ trucks.
Challenge
Operations data scattered across scheduling system, HR database, and vehicle registry with no unified view of driver availability vs fleet capacity.
Solution
- Built Python data pipeline aggregating scheduling, HR, and vehicle data sources
- Developed 7-type anomaly detection system for operational issues
- Created integration module for internal backoffice payroll deductions
Results
40%
Driver-vehicle balance visibility
100K+
Anomaly types detected automatically
15min
Reports generated daily
Tech Stack
Microservices Migration
Led migration of content authorization service from Kotlin to Go, improving performance and maintainability while creating new Go microservices.
Challenge
Legacy Kotlin service had performance bottlenecks and was difficult to maintain. Team needed to standardize on Go for better consistency across microservices.
Solution
- Migrated content authorization microservice from Kotlin to Go
- Created new Go microservices following DDD patterns
- Built Python dev-ex tool to orchestrate local containers
Results
3x
Performance improvement
60%
Reduced memory usage
0
Downtime during migration
Tech Stack
User Management Microservice
Architected and built the central user management microservice, leading PHP7 to PHP8 migration and implementing enterprise SSO integration.
Challenge
Monolithic application couldn't scale for enterprise clients. User management was tightly coupled and needed extraction into a separate service with SSO support.
Solution
- Designed and built user management microservice from scratch
- Led PHP7 to PHP8.1 migration across all services
- Implemented OAuth2/SSO for enterprise clients
Results
PHP 8.1
Migration completed
50%
Faster user operations
SSO
Enterprise SSO integration
Tech Stack
Platform Modernization & Kubernetes Migration
Led complete platform modernization: Angular.js to React migration, PWA instead of native apps, and infrastructure migration from VPS to Kubernetes on GCP.
Challenge
Legacy Angular.js frontend, single VPS hosting, and requests for native mobile apps. Limited budget required creative solutions.
Solution
- Migrated frontend from Angular.js to React
- Built Progressive Web App instead of native mobile apps
- Migrated from VPS to Kubernetes on GCP
Results
K8s
Infrastructure on GCP
PWA
Cross-platform mobile solution
React
Modern frontend stack
Tech Stack
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