Hire the Best Java Developers in California

I am a software engineer with 20 years of experience in multiple industry. I am a very passionate and an excellent problem solver. I work with Java 11 using Spring, Elastic Search, Jersey, Hibernate, Postresql , Mysql and ActiveMQ. I also have a lot of experience in AWS services such as Cloudformation, DynamoDB, Lambda, SQS , RDS. I have the AWS developer associate certification.

𝗥𝗲𝗹𝗶𝗮𝗯𝗹𝗲 𝗔𝗜 𝗱𝗼𝗲𝘀𝗻'𝘁 𝗰𝗼𝗺𝗲 𝗷𝘂𝘀𝘁 𝗳𝗿𝗼𝗺 𝗯𝗲𝘁𝘁𝗲𝗿 𝗽𝗿𝗼𝗺𝗽𝘁𝘀. 𝗜𝘁 𝗰𝗼𝗺𝗲𝘀 𝗳𝗿𝗼𝗺 𝗯𝗲𝘁𝘁𝗲𝗿 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴. 𝗜 𝗯𝘂𝗶𝗹𝗱 𝗔𝗜 𝘁𝗵𝗮𝘁 𝗲𝗮𝗿𝗻𝘀 𝗶𝘁𝘀 𝘄𝗮𝘆 𝗶𝗻𝘁𝗼 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻. First call is free — no pitch, just a conversation about what you need. I spent 5 years as a backend engineer at Walmart, Oracle, and VMware, building systems where reliability wasn't optional. Now I apply that same engineering discipline to AI — because the gap between a promising demo and a product your customers can depend on is almost always engineering work, not model work. Datalumina-certified AI Engineer, focused on production-ready RAG, LLM orchestration, and evaluation. I write about RAG, LLM evaluation, and production AI engineering — happy to share case studies and technical posts on our first call. ✦ 𝗪𝗵𝗮𝘁 𝗜 𝗯𝘂𝗶𝗹𝗱 • RAG assistants that cite their sources and gracefully say "I don't know" • Support chatbots grounded in your docs and ticket history — ones that actually resolve • Internal AI tools wired into your CRM, database, or Notion — the kind your team keeps using after week one • Python-based workflow automation that quietly runs the work no one wants to do manually ✦ 𝗛𝗼𝘄 𝗜 𝘁𝗵𝗶𝗻𝗸 𝗮𝗯𝗼𝘂𝘁 𝗔𝗜 𝘄𝗼𝗿𝗸 • Retrieval and cost-optimization first, model second. • I evaluate before I promise — if I can't measure it, I won't claim it won't break • Guardrails from day one — not bolted on after the first embarrassing output • I match the tool to the problem — sometimes a scheduled script beats an AI agent, and I'll tell you when that's true ✦ 𝗧𝗼𝗼𝗹𝘀 𝗜 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵 𝗟𝗮𝗻𝗴𝘂𝗮𝗴𝗲𝘀 • Python • SQL 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 • FastAPI • PostgreSQL • Redis queues 𝗔𝗜 / 𝗠𝗟 • OpenAI • Claude • Gemini • PydanticAI • LangChain 𝗥𝗲𝘁𝗿𝗶𝗲𝘃𝗮𝗹 • PostgreSQL with pgvector and TimescaleDB • Semantic search, Hybrid search 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 • Python • Scheduled jobs 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 • Hetzner Cloud • AWS • Docker • Git ✦ 𝗛𝗼𝘄 𝘄𝗲'𝗹𝗹 𝘄𝗼𝗿𝗸 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿 • Our first call is free — we figure out what "done" looks like before I quote • I write down scope, tests, and acceptance criteria, so you always know where we stand • You'll get readable code, short docs, and a working demo — never a black box • I don't disappear at handoff — I'll help you through deployment and the first round of real-world fixes Tell me what you're trying to solve. I'll ask the right questions before quoting anything.

My Specialties: - PySpark development/optimization - Airflow DAG architecture - AWS EMR pipelines - Parquet / S3 performance - Spark shuffle optimization - Python developement I am a Python Data Engineer and my services primarily include: 1/ The development, design and evaluation of ETL/ELT pipeline (this is the core my expertise) 2/ Python development . and 3/ My Data engineering services would include expertise with : - Airflow - SPark/pySpark - EMR and setup of Spark EMR clusters - Python coding - S3 Buckets (creation, Update, OCR upload, ...) - dynamoDB - postgresSQL I do also offer: - Unix Shell scripting (for which I am guru off) - ETL Workflow design (for which I am an expert of) - genAi with the use of Milvus or pgvector My development work comes fully QA tested and ready to be promoted in production. On demand I will include all Unit-test Pytest functions. My work is guaranteed, you are 100% satisfied or it is 100% free! My work also includes project management as I will divide my tasks accordingly and can segment my project in user stories if that can help your organization.

Seasoned software developer with broad experience and skills: • Web application and server development, from proprietary C++ to J2EE to LAMP. • WordPress plugin; Laravel application • Adoption/integration of thirdparty components into applications. • Single page web applications with Javascript; HTML/CSS; Bootstrap, Vue.js • Web site setup and administration. • Porting C++ code from Unix to Windows. Write clean, robust, and well documented code.

Getting things done start to finish, high complexity projects, diverse technologies, performance, reliability and quality. I have a track record of solving difficult problems and delivering complex cross functional software projects, deploying engineering solutions that benefit the entire organization, and defining key technical standards. I build, coach and support stellar teams while being hands-on and fully engaged in technical intricacies. Core specializations: - Complex distributed systems - design, architecture, quality control, maintenance strategies - Identity management, account security, financial compliance, KYC, data privacy - Large systems modernization and refactoring - Operations reliability, high availability/high performance services - Defining organizational standards, mentoring, tech hiring strategies Platforms and environments: - backend and full stack web development - high availability services and applications - cross platform mobile development Technology background: - software development: Java, Scala, Clojure, ClojureScript, Python, JavaScript, Dart, TypeScript, PHP - deployment and maintenance: Linux, FreeBSD, AWS, GCP, Grafana, Prometheus - databases: PostgreSQL, MySQL, Oracle, MongoDB, DynamoDB and others - mobile development: React Native, Flutter, native iOS apps

You have an idea. You need it built fast, clean, and ready for real users. That is exactly what I do. I am a full-stack developer who ships production-ready MVPs in 7-14 days. My workflow combines AI-assisted development tools with 5+ years of software engineering experience (Java, Python, React, Salesforce), which means I deliver in days what traditional dev shops quote in months. What you get when you work with me: - A working, deployed product not a prototype or wireframe - Professional UI built with modern React/Next.js - Backend, database, and authentication fully configured - Analytics dashboard so you can track users from day one - Full codebase on GitHub with documentation - AI and automation integrations (OpenAI, n8n, LangChain) if your product needs them My tech stack: React, Next.js, TypeScript, Python/FastAPI, Node.js, PostgreSQL, Firebase, Salesforce (Apex, LWC, Flows, Experience Cloud), n8n, OpenAI API, LangChain. My background: 4 years as a backend Java developer, now a Salesforce Developer/Administrator managing three enterprise-scale applications. I bring enterprise-grade thinking to startup-speed execution. If you have an idea and a timeline, send me a message. I will respond with a free project scope and timeline estimate within 24 hours.