Danilo Vrancic

Full-stack engineer on a production SaaS platform, owning features end to end. • Cut daily bug reports by 90% by fixing root causes in production • Built company-wide automations that made workflows 70% faster • Migrated Airtable data to self-hosted PostgreSQL, cutting costs and vendor lock-in • Designed SaaS systems, microservices and REST APIs (OpenAPI/Swagger) • Built React features with reusable components and state management • Implemented BullMQ queues with failed-job monitoring and retries • Automated workflows with n8n, Make, Airtable and third-party APIs • Self-hosted n8n on AWS with Terraform • Reworked GitHub Actions CI/CD; monitored production with Sentry and CloudWatch • Shipped tested releases with Vitest and Cypress • Worked in Agile sprints with stakeholders and cross-team code reviews • Used AI coding agents (OpenAI Codex, Devin AI) daily Tech: React, TypeScript, Node.js, PostgreSQL, Redis, AWS, Terraform, n8n, BullMQ

Delivered full-stack web and mobile applications for clients, from requirements to deployment. • Built web apps with React, TypeScript, Node.js, Java and Spring Boot • Developed mobile apps with React Native and Flutter • Designed REST APIs and databases with PostgreSQL, SQLite and AWS • Integrated third-party APIs and services • Worked directly with clients on requirements, design, debugging and ongoing improvements • Earned repeat work and consistently positive client feedback

Built IoT and backend prototypes in an Agile team. • Built a Raspberry Pi sensor-data pipeline with data processing, database storage and a FastAPI backend • Developed a port-scanning service that detects hot-plugged devices automatically, reducing manual configuration • Integrated simulated STM32 sensor data and contributed to testing and documentation