Harco Jellema

– participated in several big (6M$ funded and more), challenging and innovative projects and produced successful products. – Designed GenAI-powered conversational and search engine integrated with user applications, and optimized for latency, relevance and response quality – Designed agentic workflows where specialized agents handled retrieval, reasoning, validation and response formatting. – extended the revenue of company by 32% by implementing digital services. (AI powered data analytics services etc.) – refactored the frontend code and built reusable/extendable components. – refactored the backend code and loose the tight coupling among the instances. – Utilized Vector databases for better AI response and low latency – developed some e-commerce and php projects by using laravel/ symfony/shopware etc. – led a team of 5 members and mentored them and met the deadline. – Built RAG pipelines combining LLM. – implemented SSO(Single Sign On) by using OAuth2.0, Twillo etc. – used node.js (nest.js) to implement RESTful APIs and build robust Servers with wide range of services. – Utilized Claude MCP server to generate more accurate and more enriched output. – empowered the products by integrating AI bots related with Open AI and GhatGPT. – converted client's requirements to frontend pages by using react, vue, angular etc. – gained 50% of increased user traffic by using microservices architecture. – developed several services by using Rust. – successfully launched AI-powered marketing tools and services(generating landing pages, videos, ads and other marketing assist actions). – integrated various third party services (Social sites, Several APIs, SaaS etc.) with ongoing products. – developed serveral mobile apps by using react-native and flutter. – developed mobile app version of several services and tools with react native. – orchestrated the infrastructure by using Docker and Kubernetes (CI/CD included) – Integrated several python AI modules. – handled DB systems by using several ORM tools such as TypeORM, Sequalizer and Prisma etc. – collaborated with QA team to test by using Jest, Mocha, Chai etc.

– designed and implemented ML Models for prediction, NLP-based use cases and classification. – Trained and used ML model as reusable model. – Improved ML output by updating AI prompt.

– Contributed to the development and optimization of multiple components within the new Google Analytics data ingestion pipeline, improving reliability and scalability. – Advised on workflow design and software development best practices, and trained internal stakeholders to improve delivery efficiency. – Designed and implemented a notification system within an existing Google application, enhancing event handling and user awareness. – Customized YouTube Ads solutions for training purposes and produced internal development guides to support adoption. – Worked on search infrastructure components, including buffering systems for Health, Insurance, and Image Viewer pipelines. – Authored JavaScript-based automated tests for Google Search engine components to improve code quality and regression coverage. – Led a data pipeline team of three engineers, delivering the product from MVP through Alpha launch. – Integrated multiple applications with Google Cloud Platform services, enabling scalable and secure cloud-native workflows. – Delivered performance optimizations and bug fixes within the Google Fiber billing system, improving system stability and accuracy.

– fixed bugs arose in ongoing projects. – developed some simple landing pages by using jQuery, Bootstrap, Tailwind CSS. – experienced with component based frameworks such as React, Vue, Angular etc. – experienced with Typescript. – used Google APIs for web scraping and google map api. – experienced with AWS services such as SNS, Route53 etc. – deployed projects on several cloud based platforms such as AWS EC2, Azure etc. – acquired strong knowledge on DB management systems such as MySQL, PostgreSQL, MongoDB etc. – experienced Agile Methodology. – acquired Git based source control skill.