Available to hire
Hi, I’m Damien Jansen, a Senior Software Engineer with over 10 years of experience building high-quality web and mobile applications. I specialize in designing scalable architectures, automating business workflows, and integrating cutting-edge AI solutions to boost operational efficiency across various industries.
I’m passionate about combining strategic business goals with technical implementation to deliver impactful solutions. Whether it’s developing real-time applications, optimizing databases, or mentoring junior developers, I strive to create user-friendly and reliable software that makes a difference.
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Language
Dutch
Fluent
English
Advanced
Work Experience
Senior Software Engineer at Capital Group
June 30, 2025 - August 1, 2025Developed a Digital Marketing System using React, Node.js and Supabase, cutting operational costs by 80%. Automated story research and generation by integrating OpenAI, Anthropic and Perplexity APIs, reducing campaign prep time by 70%. Built a real-time campaign dashboard and enhanced email segmentation accuracy with serverless functions. Leveraged AWS cloud services ensuring 99.9% uptime and implemented GraphQL to reduce query response times by 60%. Automated CI/CD pipelines improving release cycles by 30%. Applied Test-Driven Development and used Storybook, reducing bugs by 50%. Developed React Native mobile app with AI-powered legal assistant chatbot, improving user engagement by 35%. Delivered a fault-tolerant API and real-time video/call app managing 10k+ concurrent calls with 99.95% uptime. Led migration of legacy data with full integrity and cost reduction. Mentored junior developers.
Senior Software Engineer at Escale Digital
June 30, 2022 - August 1, 2025Built HIPAA-compliant patient management system with React and FastAPI, boosting registration efficiency by 40% and reducing appointment scheduling time by 30%. Improved application responsiveness using Redis caching and custom socket library. Led UI/UX redesign for web and mobile apps with React and Tailwind CSS increasing user engagement by 30%. Automated Azure DevOps CI/CD pipelines, speeding release cycles by 25%. Architected scalable microservices with Node.js, FastAPI and Docker, managed event-driven systems using Kafka and RabbitMQ. Integrated third-party APIs and payment gateways while ensuring authentication and security compliance. Deployed AI solutions using OpenAI's GPT models to enhance automation and support.
Full Stack Engineer at Exprivia
January 31, 2020 - August 1, 2025Refactored frontend apps with Next.js and React Hooks, reducing codebase size by 30%. Built education applications improving engagement and workflows by 40%. Delivered e-commerce and data platforms using GraphQL and web scraping. Created reusable UI components with Tailwind CSS cutting development time by 20%. Enhanced SEO and loading speeds resulting in 25% growth in organic traffic. Developed scalable APIs handling high traffic and built intelligent chatbots using OpenAI APIs to improve customer interactions. Developed AI-powered recommendation systems increasing engagement by 25%. Effectively communicated technical solutions to non-technical stakeholders.
Full Stack Developer at Dutch Branders
June 30, 2017 - August 1, 2025Implemented React.js components achieving 95% design accuracy from Figma. Used Redux and Jotai to enhance state management and improve performance. Improved client-side performance via lazy loading and code splitting. Built scalable RESTful APIs with Express.js, improving response times by 40%. Developed JWT-based authentication with RBAC for security. Optimized MongoDB queries and used PostgreSQL for structured data. Implemented caching strategies and performed code reviews to ensure quality and maintainability. Applied debugging techniques reducing bug resolution time by 25%. Configured Webpack for optimized bundling improving release processes.
Junior Web Developer at KPN
February 28, 2015 - August 1, 2025Transformed UI/UX designs into pixel-perfect functional websites using HTML, CSS, jQuery, and Bootstrap with 95% design consistency. Contributed to requirement gathering and improved project delivery times by 15%. Implemented interactive UI elements and custom plugins improving user engagement by 20%. Developed 120+ responsive HTML pages supporting multiple themes, reducing design inconsistencies by 30%. Improved page responsiveness through Ajax and jQuery. Worked on backend functionality using PHP with Laravel and MySQL.
Senior Software Engineer at Capital Group
June 30, 2025 - August 1, 2025Developed a Digital Marketing System using React, Node.js and Supabase, reducing operational costs by 80%. Integrated OpenAI, Anthropic API and Perplexity API for automating story research and generation, cutting campaign prep time by 70%. Built a real-time campaign dashboard and re-architected automation logic using serverless functions. Leveraged AWS for hosting with 99.9% uptime, implemented GraphQL for API query efficiency, and automated CI/CD processes to speed up release cycles by 30%. Applied Test-Driven Development and published a React Native mobile app with an AI-powered legal assistant chatbot, increasing user engagement by 35%. Led development of a high-performance API layer and real-time video/call application with 99.95% uptime, designed and deployed containerized microservices reducing infrastructure costs by 25%. Managed data migration with 100% integrity and mentored junior developers.
Senior Software Engineer at Escale Digital
June 30, 2022 - August 1, 2025Built a HIPAA-compliant patient management system with React and FastAPI, improving registration efficiency by 40%. Optimized caching with Redis, enhanced real-time data exchange, led UI/UX redesign for web and mobile apps resulting in 30% user engagement increase. Improved database performance reducing report generation time by 30 seconds. Automated CI/CD pipelines with Azure DevOps, developed scalable microservices architectures using Node.js, FastAPI, and Docker. Integrated third-party APIs and payment gateways, drove architectural improvements with Kafka and RabbitMQ for event-driven systems. Implemented AI-driven solutions using OpenAI's GPT models to automate and enhance customer support.
Full Stack Engineer at Exprivia
January 31, 2020 - August 1, 2025Refactored frontend applications with Next.js and React Hooks, improving maintainability by reducing codebase size by 30%. Built education applications improving engagement and workflows by 40%. Delivered e-commerce and data platforms using GraphQL and web scraping, increasing data efficiency by 30%. Created reusable UI components with Tailwind CSS, enhanced SEO and load speed resulting in 25% organic traffic growth. Developed scalable APIs handling 10,000+ requests per minute, built intelligent chatbots and AI-powered recommendation systems, improving user engagement by 25%. Communicated complex technical solutions clearly to non-technical stakeholders.
Full Stack Developer at Dutch Branders
June 30, 2017 - August 1, 2025Achieved 95% design accuracy translating Figma designs to React.js, implemented Redux and Jotai for state management. Improved client-side performance via lazy loading, code splitting, and React Suspense. Developed scalable RESTful APIs with Express.js, reducing response times by 40%, implemented JWT authentication and RBAC. Integrated MongoDB with Mongoose ORM and PostgreSQL for data management, used caching strategies for response improvement. Conducted code reviews and applied advanced debugging, configured Webpack for optimized deployments.
Junior Web Developer at KPN
February 28, 2015 - August 1, 2025Translated UI/UX designs to websites with HTML, CSS, jQuery, Bootstrap ensuring 95% design consistency. Improved project delivery times by 15% through requirements gathering and development collaboration. Developed interactive user interface effects and custom plugins, increasing user engagement by 20%. Produced over 120 responsive HTML pages supporting multiple themes, improving design consistency. Utilized Ajax, jQuery for DOM responsiveness, contributed to backend development using Laravel and MySQL.
Education
Bachelor's degree at Erasmus University Rotterdam
August 1, 2011 - July 31, 2014Bachelor's degree at Erasmus University Rotterdam
August 1, 2011 - July 31, 2014Qualifications
Industry Experience
Software & Internet, Healthcare, Financial Services, Travel & Hospitality
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Hire a Full Stack Developer
We have the best full stack developer experts on Twine. Hire a full stack developer in Rotterdam today.