Karlo B.

Developed a comprehensive mobile and web application for lawyers and judges to manage legal cases and court notices. Seamlessly integrated with government digital services while ensuring security and data protection.

• Integrated advanced AI capabilities by training custom models, utilizing vector databases for efficient RAG and LangChain to streamline AI workflows
• Created a data pipeline processing 5 million court notices and normalizing the data for embedding using Python
• Implemented a custom backend using .NET and MartenDB
• Implemented a mobile client using React Native and Expo for Android and iOS
• Implemented a web client using Next.js
• Integrated with government digital services

• Built a comprehensive ecosystem for image signing, verification, and management using C2PA standard
• Solely architected and implemented both backend and frontend systems, ensuring full AWS serverless deployment (Lambda, DynamoDB, S3, CloudFront, SQS, SNS, SST)
• Engineered SDK for iOS and Android featuring advanced protect and inspect methods, complete with detailed Fumadocs documentation for streamlined integration
• Integrated private Certificate Authority for ephemeral certificate generation and management
• Created public API for third-party verification
• Contributed to the open-sourced TypeScript SDK for C2PA

• Designed and oversaw the migration of a monolithic system to the cloud using a microservices architecture.
• Developed and implemented a strategic roadmap for the migration process, ensuring minimal disruption to ongoing operations.
• Collaborated closely with cross-functional teams to define and prioritize microservices, optimizing for system performance and scalability.
• Architected and implemented DevOps practices to streamline deployments and improve system reliability.
• Conducted assessments and evaluations to identify areas for improvement in the migration strategy and microservices architecture.
• Established and enforced best practices for code quality, security, and scalability within the microservices ecosystem.
• Provided technical guidance and mentorship to the development team, fostering a culture of continuous learning and innovation.
• Managed and optimized AWS cloud infrastructure to meet performance, security, and scalability requirements.
• Implemented CI/CD pipelines using GitHub Actions to automate the build, test, and deployment of microservices.

• Designed and implemented a scalable, multi-tenant back-office system for Community21 using Azure Cloud, .NET 7, and Next.js
• Integrated Azure AD B2C to ensure secure and seamless user authentication and authorization within the system
• Applied Clean Architecture principles, leveraging Domain-Driven Design (DDD) and Command Query Responsibility Segregation (CQRS) patterns to establish a modular and maintainable architecture
• Created a data-driven solution utilizing Azure SQL Database and Azure Blob Storage to manage participant information and analyze program performance efficiently
• Ensured the system's compliance with industry standards and data security protocols, prioritizing the privacy and confidentiality of participant information

• Designed and implemented a scalable, multi-tenant back-office system for Community21 using Azure Cloud, .NET 7, and Next.js
• Integrated Azure AD B2C to ensure secure and seamless user authentication and authorization within the system
• Applied Clean Architecture principles, leveraging Domain-Driven Design (DDD) and Command Query Responsibility Segregation (CQRS) patterns to establish a modular and maintainable architecture
• Created a data-driven solution utilizing Azure SQL Database and Azure Blob Storage to manage participant information and analyze program performance efficiently
• Collaborated closely with stakeholders to understand project requirements and ensure alignment with the goals of supporting disadvantaged young people and addressing social issues
• Led the development efforts as a software architect, overseeing the technical aspects of the project and ensuring adherence to best practices
• Conducted regular assessments and optimizations to enhance system robustness, scalability, and performance
• Ensured the system's compliance with industry standards and data security protocols, prioritizing the privacy and confidentiality of participant information

• Ensured seamless integration and functionality of the system components
• Conducted troubleshooting and debugging of issues within the system
• Ensured code quality through rigorous testing and code reviews
• Managed and monitored system deployments using Docker, Traefik, and Portainer
• Utilized RabbitMQ for efficient message queuing and processing
• Implemented and maintained background job processing using Hangfire
• Engaged in version control and continuous integration/continuous deployment (CI/CD) using GitLab pipeline

• Ensured seamless integration and functionality of the system components
• Conducted troubleshooting and debugging of issues within the system
• Ensured code quality through rigorous testing and code reviews
• Managed and monitored system deployments using Docker, Traefik, and Portainer
• Utilized RabbitMQ for efficient message queuing and processing
• Implemented and maintained background job processing using Hangfire
• Engaged in version control and continuous integration/continuous deployment (CI/CD) using GitLab pipeline

Senior Software Engineer – Global Multi-Tenant D2C eCommerce Platform

• Worked on a large-scale direct-to-consumer eCommerce platform supporting multi-vendor, multi-brand, and multi-market operations in both standardized and localized formats.
• Centralized the configuration management of all microservices to enhance scalability and maintainability.
• Identified and automated manual processes across the organization to increase operational efficiency.
• Streamlined the deployment process for launching the system in new markets and rolling out new features.
• Led integrations with Contentful (CMS) and Commercetools (headless commerce).
• Implemented performance enhancements and optimizations to improve system speed and reliability.
• Contributed to system design and architectural discussions, focusing on scalability and robustness.
• Provided technical mentorship and guidance to the development team, promoting a collaborative and high-performing work environment.

Senior Software Engineer – eTicketing Project for Public Transport

• Served as a software architect and full-stack web and mobile developer on a public transport modernization project in Split, Croatia.
• Developed mobile and web applications for trip planning and ticket purchasing.
• Built real-time integrations with vehicle on-board units for live data communication.
• Implemented a comprehensive back office and fleet management system.
• Integrated multiple payment providers to support secure transactions.
• Connected the system with Google Maps using the GTFS standard for route data.
• Used Google Firebase for push notifications and app integrity checks.
• Implemented ETA (Estimated Time of Arrival) calculations through Google APIs.
• Managed authentication and authorization via Keycloak.
• Utilized Figma for UX design and interface prototyping.

Lead Developer – Electronic Toll Collection System

• Led a cross-functional team of developers and designers.
• Acted as the software architect and full-stack developer for modernizing Croatia's highway toll collection system.
• Delivered web and mobile applications for account management and media top-ups.
• Integrated payment gateways for seamless transactions.
• Used Google Firebase to manage push notifications.
• Developed a voucher distribution system and back-office portal.
• Built integrations with ETC devices and smart card infrastructure.
• Improved system performance through SQL query optimization and database indexing.

Full-Stack Developer – Government Digital Services Platform

• Contributed to a unified digital platform consolidating citizen services and form submissions.
• Integrated with multiple payment providers for transactional features.
• Enabled secure login via NIAS (eIDAS-compliant) authentication.
• Integrated with Croatia’s e-Građani (e-Citizens) portal to streamline government-citizen interactions.

Cross-platform game development implementing own ideas and solutions (PC, mobile and browser games)

• Developed and published over 20 web, mobile and PC games with over 5 million players in total
• Publishing on Google Play and App Store
• Optimized performance, build size and quality to deliver better cross platform experience
• Ads and InApp purchases integration
• Apple Game Center and Google Play Games Services integration for leadboards and achievements
• Implemented monetization strategies, analytics, and utilized reverse-engineering including code obfuscation