Ajdin Lojić

Software Engineer

About me

Software Engineer with a passion for building scalable and efficient web applications. Skilled in backend development using Ruby, Node.js, and frameworks including Ruby on Rails, Express, and Nest.js. Proficient in modern frontend technologies including JavaScript, TypeScript, and frameworks/libraries like React and Next.js. Dedicated to delivering efficient and user-friendly solutions.

Career Summary
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Software Engineer (Backend)
Klika
Jan 2026 to Present
  • Building and optimizing backend services with Ruby on Rails, PostgreSQL, and Elasticsearch for full-text search and data indexing
  • Managing asynchronous workflows with Sidekiq, including scheduled jobs (sidekiq-cron) and unique job processing at scale
  • Deploying and managing applications on Heroku, integrating AWS services (S3, Lambda, ECS, KMS) for cloud storage, serverless functions, and secure data encryption
  • Monitoring application health and performance using Sentry for error tracking and performance monitoring
  • Implementing authentication and authorization systems with Devise, Doorkeeper (OAuth), and Pundit for policy-based access control
  • Writing and maintaining test suites with RSpec and Minitest, ensuring code quality with RuboCop
Software Engineer (Full Stack)
Klika
Sep 2024 to Dec 2025
  • Developed and maintained a full-stack Ruby on Rails application with RESTful APIs, advanced ActiveRecord associations, and complex business logic
  • Optimized database performance through SQL query tuning, caching with Redis, and background job processing with Sidekiq
  • Built modern React/TypeScript frontend components with ChakraUI, applying atomic design principles and custom hooks
  • Implemented comprehensive test coverage using RSpec for backend and Jest/React Testing Library for frontend
  • Architected real-time features with Action Cable for live updates and notifications
  • Enhanced overall application performance through database indexing, query optimization, and efficient frontend state management
  • Deployed and managed application infrastructure on Heroku with CI/CD pipelines and environment configuration
Software Engineer (Frontend)
Scanspire
Mar 2024 to Dec 2025
  • Developed dynamic web applications using React/Next.js with server-side rendering (SSR) and static site generation (SSG) for optimal performance
  • Built interactive, real-time user interfaces with jQuery and AJAX
  • Created responsive, mobile-first layouts using Bootstrap, ensuring cross-browser compatibility
  • Implemented modern frontend practices including component reusability, state management, and API integration
  • Optimized application performance through code splitting, lazy loading, and efficient data fetching
Software Engineer (Frontend)
Trinity
Feb 2024 to Aug 2024
  • Developed scalable web applications using TypeScript with React/Next.js, ensuring high performance in client-side and server-side rendering
  • Built responsive and consistent user interfaces with Material UI
  • Optimized application performance and user experience through advanced frontend techniques
  • Integrated backend services and collaborated with backend developers to ensure efficient data flow
  • Created UI prototypes and design handoffs in Figma for streamlined collaboration
Software Developer (Frontend)
Experfy
Aug 2021 to Dec 2023
  • Developed and maintained front-end applications using React and Ember, ensuring seamless rendering and improved performance
  • Designed responsive user interfaces with HTML, CSS, and Bootstrap for cross-device compatibility
  • Optimized web applications for speed and user experience through modern frontend techniques
  • Integrated data from backend services and collaborated with backend developers to ensure smooth data flow
  • Created UI prototypes with Adobe XD and contributed to best practices in version control using Git

Skills

Coding Languages:
JavaScript, TypeScript, Ruby, Node.js
Frameworks:
React, Next.js, Ruby on Rails, Express, Nest.js, React Router, Redux
Other:
Material UI, Chakra UI, Tailwind CSS, Bootstrap, Figma, SQL, NoSQL, Git

Qualities & Hobbies

Personalities:
  • Accuracy
  • Organization
  • Creativity
  • Communication
Hobby:
  • Motorcycling
  • Skiing
  • CryptoCurrency