I design and lead enterprise-scale data engineering solutions with over a decade of experience in the finance sector. My expertise spans Apache Spark, Kafka, Hadoop, and Python, enabling me to craft high-performance data platforms tailored for investment banking and wealth management. I focus on building robust ETL processes, ensuring effective data lineage and metadata management. With around 50 months of onsite experience in Switzerland, I have delivered critical solutions that enhance decision-making and operational efficiency. I specialize in both batch and streaming processing, allowing organizations to leverage big data effectively. If you are looking for a technical lead who can translate complex data requirements into scalable solutions, let's connect to discuss how I can contribute to your vision.

Proficient in using SpringMVC, Spring, MyBatis, MyBatis plus Java web framework technologies; Proficient in using MySql, Oracle, GBase, Dm, and database development, with a certain understanding of database optimization; Proficient in using development tools such as IntelliJ IDEA, Postman, Git, Maven, etc; Proficient in using nifi to configure ETL tasks Proficient in using Docker to quickly deploy services Proficient in using Javascript; Familiar with Vue+AntDesignVue for page development; Proficient in Hadoop, Spark, Kafka, Janusgraph, Hive, HBase, Elasticsearch big data framework technologies; Proficient in writing Spark task scripts in Scala language Familiar with Quartz task scheduling, it can help us complete scheduled task operations; Familiar with Redis caching technology, it can help us cache hot data and speed up our queries. Familiar with Springboot style for development, it does not require excessive configuration, making our development faster; Familiar with the Springcloud distributed microservice architecture and able to quickly build it;

I am a Junior Big Data and AI Developer with a background in Full Stack Web Development and DevOps, currently pursuing a Master’s degree in Big Data and Artificial Intelligence. My profile combines software development, data engineering, artificial intelligence, machine learning, deep learning, NLP, cloud computing, and digital transformation. I am interested in building data-driven solutions that help companies collect, process, analyze, automate, and use data to make better business decisions. I have hands-on experience with Python, SQL, data preprocessing, data cleaning, feature engineering, machine learning, and Big Data technologies such as Apache Spark, Hadoop, Hive, HBase, and distributed data processing. I am also developing my skills in cloud computing, especially Microsoft Azure, to design scalable and modern data solutions. For my final year project, I designed and developed a Time and Attendance Management System for a transport and logistics company. This application included user management, authentication, attendance tracking, breaks, leave requests, work schedules, lateness alerts, HR dashboards, worked-hours calculation, and database management. This project allowed me to understand how digital transformation can improve business processes and how to transform operational needs into technical solutions. Currently, I am working on Big Data and AI projects, including predictive maintenance. The objective is to collect sensor data, preprocess and transform it, build machine learning and deep learning models, predict failures, and provide useful insights through dashboards. I am also interested in NLP projects, intelligent automation, recommendation systems, and AI-powered applications. I can help you with: - Data cleaning, preprocessing, and transformation using Python and Pandas - Data analysis and visualization - SQL database queries and data extraction - ETL workflows and data pipelines - Big Data processing with Apache Spark - Hadoop ecosystem basics: HDFS, Hive, and HBase - Machine learning models for prediction and classification - Deep learning projects using TensorFlow or PyTorch - NLP tasks such as text preprocessing, classification, and sentiment analysis - Dashboard creation and reporting - API development for AI and data applications - Cloud-based data solutions using Microsoft Azure basics - Full Stack web applications connected to data systems - Digital transformation projects and process automation My technical skills include Python, Pandas, NumPy, Scikit-learn, TensorFlow, PyTorch, NLP, SQL, Apache Spark, Hadoop, Hive, HBase, Microsoft Azure, Machine Learning, Deep Learning, Data Analysis, Java, Spring Boot, REST APIs, HTML, CSS, JavaScript, Angular, React, Git, GitHub, Docker basics, and DevOps fundamentals. I am serious, organized, detail-oriented, and motivated to deliver clean, reliable, and well-documented work. My goal is to help clients transform raw data into practical insights, intelligent applications, and useful digital solutions.

14 years building Java backend systems. I specialize in real-time data processing and high-throughput microservices — not PowerPoint architecture. • Processed 130M–150M device events/day with Flink + Kafka + ClickHouse • Built APIs handling 15M+ requests/day (Spring Boot + Dubbo) • Optimized core billing module — 10x faster through caching & async processing Tech stack: Java, Spring Cloud, Dubbo, Flink, Kafka, ClickHouse, Doris, MySQL, Redis, Elasticsearch, RocketMQ. I write code, tune queries, and fix production issues. I've worked with international teams and can deliver across time zones. Available immediately. Let's build something that scales.

Hi, I'm Pengfei Zhao, a Senior Java Backend Engineer with 6+ years of hands-on experience. I specialize in high-concurrency system architecture, Industrial IoT (IIoT) data pipelines, and deep production-level troubleshooting. Architecture & Microservices: Proven track record of driving greenfield architecture design and legacy system refactoring. Expert in Spring Boot/Cloud ecosystems and multi-model database optimizations (MySQL sharding, Redis, Doris, MongoDB). High-Concurrency & IoT Data Ingestion: Extensive experience handling massive device data streams using Apache Kafka and MQTT. Proficient in fine-tuning QoS/acks for traffic-shaving and implementing Dead Letter Queues (DLQ) for flawless data recovery. Full-Stack Troubleshooting: Strong capability in progressive debugging, from analyzing Kafka consumer lag down to OS-level metrics (vmstat, network/disk I/O bottlenecks). Successfully root-caused hardware-level I/O blockages within decoupled storage-and-compute architectures. GenAI Integration: Hands-on experience orchestrating LLMs and Voice AI (TTS) to build autonomous AI workflows, agents, and custom skill integrations. I am a result-oriented technical anchor who thrives in asynchronous, text-based remote collaboration. Available immediately and ready to bring robust, scalable Java solutions to your project!

• Over 14 years of Software development using multiple Programming languages (Java, Python, Dotnet, Scala), Mostly in Java. • Strong Knowledge of Java & new Java 8, 11 & 17 features (functional Interfaces, Streams ...). • Knowledge of MicroServices Architecture and design patterns (Event Driven, CQRS, ....). • Reactive programming using Spring reactor and Akka Actors • Possesses experience in object oriented applications analysis, design, implementation and Testing. • Successfully designed and implemented systems based on N-tier distributed architecture. • Strong experience in different types of Databases SQL & NoSQL includes Oracle, MySQL, Postgres, Hbase, DynamoDB. • Proven background leading teams in stressful, deadline-oriented environments. • Excellent communication and interpersonal skills and good team player. • Strong knowledge of agile methodologies. • Ability to learn new technology quickly and seamlessly manage workload to meet the deadline.

I am a full-stack developer with 7 years of experience delivering scalable software solutions across Australia and China. My expertise spans backend development, cloud integration, and distributed systems. I've crafted high-performing Java/Spring Boot messaging platforms and C# Azure Functions integrations, along with developing Python and PostgreSQL recruitment workflows. I specialize in system design and improving performance and reliability. I excel in troubleshooting production issues, conducting thorough code reviews, and mentoring junior developers, ensuring that I translate complex business requirements into maintainable software. If you’re looking for a developer who can tackle challenges and deliver robust solutions, let’s connect to discuss your project needs.

Innovative Full Stack Senior Software Developer and Systems Architect A highly skilled professional with extensive expertise in leading-edge software development, system architecture, and project management. Specializes in event-driven websites, iot, big data, automation, embedded programming, llms, robotics, cloud engineering, continuous integration, and delivery. A proven track record of pioneering robust, scalable systems and leading projects from concept to completion with precision and efficiency.

I’ve 14+ years of full-stack development experience. I have experience in both front end development as well as back-end development. 𝗜 𝗮𝗺 𝗲𝘅𝘁𝗲𝗻𝘀𝗶𝘃𝗲𝗹𝘆 𝘂𝘀𝗶𝗻𝗴 𝗔𝗜 𝗳𝗼𝗿 𝘀𝗺𝗮𝗿𝘁 𝗰𝗼𝗱𝗶𝗻𝗴 𝗳𝗼𝗿 𝘁𝗶𝗺𝗲 𝗼𝗽𝘁𝗶𝗺𝗶𝘀𝗮𝘁𝗶𝗼𝗻. I'm relying on fast delivery and I do precision checking of codes which are generative in nature. This saves project costing and timeline. I'm fluent in Claude, OpenAI and all the latest Agentic platforms. Here's my area of expertise: 𝐃𝐞𝐥𝐢𝐯𝐞𝐫𝐞𝐝 𝟓𝟎𝟎+ 𝐖𝐞𝐛/𝐀𝐩𝐩𝐬 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐟𝐨𝐫 𝐀𝐦𝐞𝐫𝐢𝐜𝐚𝐧/𝐔𝐒𝐀, 𝐀𝐮𝐬𝐭𝐫𝐚𝐥𝐢𝐚𝐧 & 𝗘𝘂𝗿𝗼𝗽𝗲𝗮𝗻 𝗖𝗹𝗶𝗲𝗻𝘁𝘀. Technology Platforms ★ Python ★ FastAPI ★ LLM Integration ★ Claude Cowork ★ Agentic AI implementation ★ AI Architecting ★ LangChain ★ Custom PHP ★ WordPress ★ WooCommerce ★ Laravel ★ NodeJS ★ CodeIgniter ★ Yii ★ PHP ★ ChatGPT Database ★ PostgreSQL ★ Supabase ★ MySQL ★ MongoDB ★ Cassandra ★ HBase ★ Oracle Front End Technologies that I master in: ★ HTML5 ★ CSS ★ JavaScript ★ Angular/ AngularJS ★ ReactJS ★ VueJS AI (Artificial Intelligence) ★ Computer Vision Application Development ★ Custom Object Detection (by training the system with custom objects) ★ Deep Learning ★ Voice Processing ★ Image Processing ★ LLM integration ★ ChatGPT integration ★ Gemini 2.0 integration ★ Dall E Integration for image generation ★ Claude Cowork ★ Agentic AI Mobile App Development ★ Flutter ★ React Native ★ Swift ★ Android Studio Functional Feature Development and API integration ★ Booking and Payment ★ Data Scraping ★ Subscription and Membership ★ Payment Gateway Integration ★ Shopping cart customisation ★ Inventory management and Inventory Automation ★ Flight Status, Flight Booking and Flight Tracking ★ Product synchronisation using RESTful API services ★ Payout Management ★ Chatbot Integration ★ Stock Market Data ★ IDX Real Estate Property Listing ★ WooCommerce based plugin development ★ WooCommerce customisation I am well-versed with RESTful API services (API integration), data scraping using Python and developing custom forms which are dynamic. I have worked with the following API: ★ ChatGPT API ★ Claude API ★ Claude Co-work ★ Clockify API Integration ★ Verkada API Integration ★ LLM API ★ Roadie API ★ Ingram API ★ Synnex API ★ Apple Weather Kit API ★ Stripe API ★ Plaid API ★ ChatGPT API ★ Assistants API ★ OpenAI API ★ Coupons ★ Affiliation ★ Async Programming ★ State Management ★ Flutter Widgets My sole focus is to deliver projects as per the client’s expectations and find my success.

Full stack Developer expert with focus on building modern, scalable applications. I have over 10+ years of professional software engineering experience and am always up to date on the newest trends, languages, and frameworks. I also have experience in all aspects of mobile app development and I have released numerous applications. I love coding and I always deliver efficient, clean, maintainable and test covered code. I focus on creating state-of-the-art ways to connect businesses with customers, easily and with outstanding results. I am capable of following strict directions as well as conceptualizing solutions that will work for you. I have created numerous tools and boilerplates to assist me in my business, which allow me to implement common features much faster. I Specialize in : - React, Vue JS, Next JS, NestJS framework - Back end Development with Python / Django/ NodeJS - Data Analytics and Machine Learning with Spark and TensorFlow - Web Scrapping and Data Mining - Software architecture development and consultation - Cloud (Windows Azure and Amazon web service) - Azure HDInsight, Hive and HBase - MVC 6 & WebAPI - Model View ViewModel Pattern (MVVM) - Frappe ERPNext - Zoho Suite - Automation : n8n, Make.com