Hire the Best Java Developers in California

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.

Full-stack developer with +25 years of experience based in Southern California. I can help you to: - upgrade and maintain your legacy Rails, Flask, Django, Odoo, PHP, React app - upgrade Heroku stack & database with minimal downtime, - implement complex D3 visualizations, refactor complex React / Vue codebase, - add/improve test code coverage in your Rails, Flask, Django, PHP, React app, - create v1 of your business idea

I have over 9 years of development and implementation experience on projects ranging from small departmental applications through complex enterprise solutions in multi-national corporate environments. My software and application expertise is very diverse and includes Java, PHP, HTML 5, python, AngularJS, Jquery , RESTful Web Services and PHP,Python Frameworks including Laravel, Codeigniter and Django. I have worked for a long time in programming, especially in web development. My attention to detail is incredibly high. Quality is the basis of everything I do! I am hard-working, friendly, efficient, and driven. 1. Software Architecture and Development Java Python, Django C++ VB 2. Open Source Codeignitor Laravel Angular Node.js React WordPress shopify Moodle Opencart wooCommerce Cake PHP 3. Automation && data scrapping. Python PHP JAVA Node.js Ruby 4. Android && iOS mobile React Native Android lonic framework Phone Gap

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.

Are you looking for an expert Mobile App Developer to help you transform your app ideas into a completed app? Do you want to create a mobile app from scratch or fix bugs or update an existing app? Having published over 20 apps to the App Stores, I can help you with the following: - Prototype, and deliver a complete working MVP app in a very short time. - Modernize and extend your legacy application while keeping existing functionality working. - Provide architectural design and review of new applications and save you time, money, and resource. - Develop a high-performance app from scratch based on your UX/UI design and wireframes or work with my designers to create one for you. - Rescue unfinished projects and identify the best, cost-effective solution to complete and launch the app. - Need custom Android OS modifications and want to work on use cases that are outside of stock Android OS. You are in the right place if you are looking to build a modern, well-tested, stable app using modern development tools and best practices. I have extensive, hands-on experience, designing, developing, and delivering the following types of mobile app - Point of Sale Applications - Payment processing Apps - Custom Video player apps - Chat and community engagement apps - CRM and Invoicing apps - Route Management and food delivery apps - Scheduling and booking apps - Time and attendance apps - Fitness business management apps - And numerous business and utility apps I do not develop games I understand that mobile apps are an important business driver for your business and as a fellow small business owner, I go the extra mile to ensure that I deliver a complete, dependable mobile application and provide ongoing support as needed to ensure your business objectives are met. See what my previous clients are saying about. My name is Val Okafor, I am a San Diego, CA-based expert Android app developer with over 8 years of mobile app development experience and overall 14+ years of industry experience. Technologies I work with - Programming languages: Java, Kotlin, JavaScript - Frameworks/Platforms: Firebase, Node.JS, TypeScript - Professional software engineering tools and methodologies - Test Driven Development, Clean Code, - Equipped to work with AOSP, Dev Kits, & IoT Devices.

I'm a developer with almost 20 years of experience (wow that's weird to think about). I've worked on legacy software products, new proof of concepts, and several startups. My specialty is in fullstack development however, over the past 4 years I have transitioned into more of a backend role. If you are facing a particular challenge in your architecture, need a simple (or complex) api built, or just need some quality development done lets talk!