John B.

📊 Backend & Data Engineer | Expert in AWS, Python & Big Data Systems | 100% Client Satisfaction 👋 Do you need to build a backend infrastructure that doesn't just "run," but effectively processes, stores, and visualizes massive amounts of data? I help data-driven companies build robust architectures using AWS, Python, and Java, turning raw data into profitable business insights. With experience across Software Engineering and Data Pipeline Architecture, I bridge the gap between application development and data warehousing. I don't just write scripts; I build scalable engines. I work across: • Custom ETL/ELT Pipelines (Batch & Real-time streaming) • Serverless Backend Architecture (AWS Lambda, API Gateway) • Data Warehousing & Data Lakes (Redshift, BigQuery, S3) • Automating workflows with Apache Airflow & Robocorp • Visualizing business intelligence via Power BI & Looker Studio Whether you need to migrate legacy data to the Cloud, build a real-time analytics dashboard, or architect a Java/Python backend, I ensure your system is fast, cost-effective, and scalable. ✅ What I bring to your project: • Hybrid Expertise: Strong Software Engineering (Java/Python) skills applied to Big Data problems. • Cloud Mastery: Deep knowledge of the AWS Ecosystem (Glue, EMR, Athena, Kinesis). • Data Quality: Implementing dbt and rigorous testing to ensure your data is accurate. • End-to-End Delivery: From infrastructure infrastructure-as-code to the final BI Dashboard. • Communication: I translate complex engineering concepts into clear business updates. 🔥 Recent Projects I've Delivered: FinTech Data Lake: Built a secure Data Lake on AWS S3 + Redshift, processing 1TB+ daily transaction data using AWS Glue & Spark. E-Commerce Real-Time Analytics: Designed a streaming pipeline using Apache Kafka & AWS Kinesis to track user behavior in real-time, visualized in Power BI. SaaS Backend Migration: Refactored a legacy monolith into microservices using Java & AWS Lambda, reducing server costs by 40%. Marketing Automation System: Developed Python scripts utilizing Robocorp to scrape competitor pricing and auto-update internal SQL databases. Healthcare Reporting Portal: Created a compliant data warehouse in BigQuery with a Looker Studio frontend for doctors to view patient trends. 🧠 Tech Stack & Skills Languages & Backend: Python (Pandas, NumPy, Boto3), Java (Spring Boot), SQL (Advanced), Shell Scripting. Cloud & Infrastructure (AWS & Google): AWS Glue, Lambda, Kinesis, EMR, Athena, Redshift, EC2, S3, IAM, Google DataProc, BigQuery. Big Data & Orchestration: Apache Spark, Apache Kafka, Apache Airflow, dbt (Data Build Tool). Databases & Storage: PostgreSQL, MySQL, Amazon Redshift, Google BigQuery, DynamoDB. Visualization & BI: Power BI (DAX), Looker Studio, Tableau, Excel (Advanced). DevOps & Tools: Git, Docker, Jenkins, CI/CD Pipelines 🧩 Typical Use Cases I Help With: • ETL Automation: Replacing manual Excel reporting with automated Python/Airflow pipelines. • Cloud Migration: Moving on-premise SQL databases to AWS Redshift or Google BigQuery. • Backend API Development: Building APIs that serve data to frontend applications. • Data Cleaning: Using dbt and Spark to clean messy datasets for Machine Learning models. • Dashboard Creation: Building "Single Source of Truth" dashboards for CEOs and Product Managers. 🏭 Industries I've Served: FinTech · eCommerce · Logistics/Supply Chain · SaaS · Healthcare · Marketing Analytics 💬 Client Feedback ⭐⭐⭐⭐⭐ "John is a rare find—he understands the code AND the data. He automated our entire reporting process on AWS." ⭐⭐⭐⭐⭐ "Excellent communication. He built a dashboard that finally makes sense of our messy database. Highly recommended." ⭐⭐⭐⭐⭐ "Technical expert. Handled our migration from on-prem to Redshift without any data loss." 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐞𝐝 𝐒𝐤𝐢𝐥𝐥𝐬: Data Engineering, Python Developer, AWS Architecture, ETL/ELT Design, Big Data Analytics, Database Administration, Business Intelligence (BI), API Development, Data Modeling, Data Warehousing, Machine Learning Integration, Real-time Data Streaming, Serverless Computing, Agile Methodologies. 🚀 Let’s Talk If you need a technical partner who can handle both the code and the data—let's connect. I will help you turn your data into your company's most valuable asset. Click ‘Invite to Job’ to start a conversation about your architecture.