• Developed a comprehensive mobile application using Flutter and Dart, focusing on user-friendly design and seamless performance across devices
• Implemented an authentication service with Next.js 13 and built an admin dashboard using Next.js 14, ensuring robust management capabilities and secure user access
• Leveraged Chakra UI and Bootstrap for design, creating an intuitive and accessible user interface
• Achieved 100% test coverage in the React components using Jest for unit and integration tests, complemented by Cypress for comprehensive system and end-to-end testing, ensuring thorough validation of both functionality and user experience
• Utilized FeathersJS for the backend, facilitating efficient API development and real-time communication features
• Integrated Github Actions for continuous integration and deployment, streamlining the development process and enhancing code quality
• Employed Sentry for proactive error tracking and monitoring, significantly boosting the application's stability by quickly pinpointing and resolving issues across environments

• Led the migration of the application from Create React App (CRA) to Vite, enhancing the development workflow and reducing build times significantly.
• Implemented comprehensive internationalization features, supporting multiple languages to cater to diverse user groups, thereby fostering inclusivity and accessibility.
• Developed robust form and validation mechanisms using Zod, improving user data integrity and interaction experience within the application.

• Implemented cost-optimization strategies, significantly reducing operational costs per device by optimizing cloud resource usage and data processing efficiency.
• Developed robust data validation processes using Zod, ensuring high data integrity for IoT device communication
• Designed and executed comprehensive unit and integration testing frameworks to ensure reliability and functionality
• Leveraged SST for efficient infrastructure as code (IaC) management, streamlining deployment and maintenance of AWS resources.
• Enhanced system resilience and throughput by architecting event-driven architectures with AWS Lambda and EventBridge, effectively handling IoT data pipelines
• Utilized Terraform alongside SST for advanced Infrastructure as Code practices, ensuring consistent and reproducible deployments across AWS cloud environments
• Orchestrated cloud infrastructure management using Terraform, achieving streamlined deployments and operational efficiency across AWS services
• Enhanced CI/CD workflows with CircleCI, automating testing and deployment processes to ensure rapid, reliable delivery of backend services for IoT applications

• Developed single-page SaaS applications with a clean architecture that separates frontend components (React), central application state (Redux), and asynchronous state transitions (Thunks)

• Implemented reusable Material-UI-based frontend components such as wizards, modals, and carousels

• Created RESTful microservices based on Express and documented the APIs with OpenAPI (Swagger)

• Used Sequelize as ORM to efficiently connect the backend logic with PostgreSQL databases

• Ensured a smooth rollout of new features by providing database schema migration scripts based on Knex

• Rolled out new features to end-users gradually using feature toggles and A/B tests

• Collaborated closely with Product Owner to respond to continuously changing & increasing project scope

• Actively shaped Agile ceremonies such as Daily Standups, Refinements, and Retrospectives

• Eliminated performance issues in Formik-based React components using Hooks and Memoization

• Created a safety net of automated integration and unit tests with Jest and Supertest

INNOVATIVE SOLUTIONS FOR EFFICIENT MANAGEMENT OF INVOICING, FINANCES, AND CUSTOMER RELATIONSHIPS FOR SMALL TO MEDIUM BUSINESSES

• Developed single-page SaaS applications, integrating React, Redux, and Thunks to enhance user experience and application responsiveness
• Architected RESTful microservices using Express, with comprehensive API documentation via Swagger, ensuring efficient backend operations and seamless service integration
• Optimized database interactions and schema migrations with Sequelize for PostgreSQL, significantly improving data management and scalability within the application framework

• Developed responsive React components according to the designs provided by the UX designer and helped maintain a consistent look-and-feel using a bootstrap-like styling library and SCSS

• Integrated backend services using TypeScript and helped migrate banking interfaces from HBCI to a more secure PSD2-conform implementation

• Supported a long-term migration from Ampersand.js to React using an opportunistic refactoring approach

• Triaged incoming issues from 1st-level customer support, fixed urgent bugs immediately, and added lessurgent bugs to the team's TFS-based backlog for later fixing

• Joined a team of 6 developers using a Scrum-like development approach and User Stories

• Continuously delivered code changes with the help of Mocha- and Chai-based test automation, shell scripting, and Jenkins