I am a Full-Stack and DevOps Engineer based in Regensburg, Germany, with more than six years of experience building and operating production software.

My work covers the complete product lifecycle—from requirements, architecture and database design to implementation, testing, deployment, monitoring and ongoing operations.

I currently work primarily with PHP 8, Laravel, React, TypeScript, React Native and PostgreSQL, supported by hands-on DevOps experience with Docker, Kubernetes, Terraform, Ansible, CI/CD and observability tooling.

I enjoy solving complex business problems, designing maintainable systems and taking genuine ownership of the software I build.

• Design scalable software architectures and data models
• Build full-stack web and mobile applications
• Develop REST APIs, real-time services and third-party integrations
• Automate testing, delivery and infrastructure provisioning
• Deploy and operate containerised production workloads
• Build analytics pipelines and data-driven product features
• Integrate payment, authentication and AI services
• Diagnose production issues and improve reliability
• Review, refactor and document software for long-term maintainability

I am the founder and sole engineer behind CityDirectory, a live local-business discovery platform available on the web, iOS and Android.

The platform currently includes:

• More than 700,000 business listings
• Coverage across 13,000+ German cities
• Content in 15 languages
• Web and React Native mobile applications
• Advertising, digital menus and appointment-booking features
• Accommodation, municipal-alert and local-discovery verticals
• Subscription billing and payment integrations
• Real-time services, analytics and automated data processing

I designed, built, deployed and operate the platform end to end, including its architecture, backend, frontend, mobile applications, databases, infrastructure and production operations.

• Laravel, Eloquent ORM, Horizon, Reverb and Cashier
• Django REST Framework
• REST APIs, WebSockets and webhooks
• OAuth 2.0, JWT and role-based access
• Stripe and OpenAI integrations

• React and TypeScript
• React Native and Expo
• Inertia.js, Livewire and Alpine.js
• Tailwind CSS, HTML5 and CSS3
• App Store and Google Play delivery

• PostgreSQL, MySQL and Redis
• MSSQL and Oracle integrations
• Relational data modelling
• High-throughput analytics pipelines
• Event ingestion, aggregation and retention automation

• Linux and Proxmox
• Docker, Docker Swarm and Kubernetes
• Terraform and Ansible
• GitLab CI/CD, GitHub Actions and Jenkins
• Traefik and Laravel Cloud
• Grafana and Prometheus
• High-availability PostgreSQL
• Staging, production and rollout automation

I believe good software should be:

• Understandable — clear architecture and readable code
• Maintainable — sensible abstractions without unnecessary complexity
• Reliable — tested, monitored and designed for failure
• Secure — authentication, authorization and data protection considered early
• Observable — production behaviour should be measurable and diagnosable
• Pragmatic — technical decisions should support real product and business needs

AI-assisted development can improve engineering speed, but generated output still requires human understanding, review, testing and accountability.

• Built and launched a multi-platform product as a sole engineer
• Reduced an operational process by 80% using a real-time device-management system
• Improved access to business intelligence by 60% through a multi-source reporting layer
• Developed software integrating MSSQL and Oracle data sources
• Built a real-time Python/Django IoT backend supporting concurrent users
• Developed an industrial metrology application with machine-control interfaces
• Maintained 95%+ ATM network uptime for banking clients
• Built a PHP incident-management system used by more than 100 employees

A reusable Laravel starter foundation for building modern applications with a consistent full-stack architecture.

My practical infrastructure work covering containerisation, orchestration, infrastructure as code, automation, networking and observability.

A production local-discovery ecosystem spanning web, iOS and Android, designed, developed and operated end to end.

• Production Kubernetes operations
• Secure AI-assisted engineering workflows
• Agentic systems and application automation
• Distributed systems and scalable data processing
• Platform engineering and developer tooling
• Advanced observability and production reliability

Activity cards only reflect public GitHub contributions and repositories. They do not represent the complete range of technologies used in my professional work.

I am interested in opportunities involving:

• Full-stack and backend engineering
• Software architecture
• DevOps and platform engineering
• Cloud infrastructure and automation
• Data integration and internal business systems
• AI-assisted product development

📍 Regensburg, Germany
📧 isaachatilima@gmail.com
🌐 citydirectory.app
💻 github.com/IsaacHatilima