Hire the Best Grails Developers

I build production AI systems that actually ship — multi-agent workflows, LLM pipelines, and the backend to run them reliably under load. Most "AI developers" stop at a prototype; I bring a decade of production engineering plus an MBA, so what I deliver holds up in production and ties to a business outcome you can measure. What I build for clients: • Multi-agent systems — orchestration layers that coordinate specialized agents to automate real workflows, not toy demos • LLM & RAG pipelines — retrieval, grounding, evaluation, and the guardrails that keep outputs reliable • AI-powered backends — Kotlin/Spring Boot and Next.js services, APIs, queues, and CDN delivery built to scale • End-to-end AI features integrated into existing products and data Background: 12+ years across enterprise platforms and ad-tech real-time bidding (high-throughput, low-latency systems), an MBA with Distinction from Bayes Business School, and current founder of an AI product company where I design and run the full stack myself. I work AI-native — an orchestrated multi-agent development setup — which means I move faster and ship more than a typical solo contractor. If you have a clearly scoped AI build and want it done right the first time, send me the details, and I'll tell you exactly how I'd approach it.

Backend & API Integrations Engineer — Java/Spring Boot, Node.js/NestJS, and the third-party integrations most teams don't want to touch (QuickBooks, Xero, payments, accounting). I build and stabilize reliable backends: clean REST APIs, microservices, and integrations that actually stay in sync. 8+ years of backend experience and 2,700+ hours delivering systems that handle high traffic and financial/inventory workflows. Where I help most: - API & platform integrations — QuickBooks Online & Xero (OAuth2, tokens, webhooks, sync, reconciliation), cXML purchase-order flows, and payment/accounting platforms - Microservices — designed and maintained 32+ services with CI/CD + Docker, improving uptime and cutting deployment time - Backend rebuilds — refactored legacy systems into scalable services with measurably higher throughput - Security — JWT, Spring Security, and Auth0 authentication/authorization - Reliability — async processing with Kafka/SQS, idempotency, retries, and rate limiting, backed by tests (JUnit, Mockito, Testcontainers) Tech I work with: Java, Spring Boot, Node.js, NestJS, Python, PostgreSQL, MySQL, MongoDB, MariaDB, Redis, DynamoDB, Docker, Apache Kafka, AWS SQS, REST, gRPC. How I work: I start with a short review of your current code/architecture, then give you a clear plan, timeline, and checkpoints — so you always know what's happening and what comes next. If you're dealing with a fragile backend, a stalled integration, or you need a new API built right the first time, send me a message describing what you're trying to achieve and I'll reply with a concrete next step. — Samson

When your backend is breaking under load, your microservices are drifting, or your APIs aren't talking to each other — I'm the engineer who fixes it without breaking everything else. I build and maintain production-grade systems using Java Spring Boot, React, Node.js, and cloud-native infrastructure. My work runs at scale: Microservices handling 20,000+ concurrent users (Spring Boot + Kafka + Kubernetes) REST APIs serving 50,000+ monthly users with clean contracts and error handling CI/CD pipelines on GitHub Actions and Jenkins with automated test gates AWS deployments (EC2, EKS, ECR, ALB) with zero-downtime rolling releases Elasticsearch integration cutting search response times from 800ms to under 200ms OAuth 2.0 + TLS security reducing vulnerability incidents by 70% What I help with: Java Spring Boot microservices — build, fix, optimize React frontend connected to backend APIs Kafka event-driven architecture Docker + Kubernetes deployments AWS cloud infrastructure CI/CD pipeline setup and maintenance API integration and debugging 100% Job Success · Rising Talent · 0-4hr response time If your system is slow, broken, or needs scaling — message me and I'll tell you exactly what's wrong.

Greetings! I am a seasoned Full-Stack Java Developer with over a decade of experience in crafting robust and scalable solutions using cutting-edge technologies. I specialize in Java frameworks such as Spring Boot and Grails, and I am well-versed in modern frontend technologies like Next.js, Tailwind CSS, and Bootstrap Skills: Programming Languages: Java, Groovy, PHP, Python Frameworks: Spring Boot, Grails, NextJS, Laravel, Django, Flask Database: MySQL, PostgreSQL, MongoDB, Oracle Web Technologies: HTML5, CSS3, JavaScript Version Control: Git, SVN, Mercurial Build Tools: Maven, Gradle Testing Frameworks: JUnit, TestNG, Spock Deployment: Docker, Jenkins Key Highlights: Extensive Experience: With a career spanning more than 10 years, I have successfully delivered a myriad of projects, showcasing my ability to adapt to evolving technologies. Spring Boot Mastery: Proficient in leveraging Spring Boot to develop microservices, RESTful APIs, and enterprise-level applications, ensuring optimum performance and scalability. Grails Proficiency: Adept at utilizing the Grails framework for rapid development, allowing for the creation of dynamic and feature-rich web applications. Frontend Expertise: Experienced in crafting engaging user interfaces using Next.js, Tailwind CSS, and Bootstrap, delivering seamless user experiences. Full-Stack Knowledge: Well-versed in both frontend and backend development, ensuring seamless integration and a holistic approach to project execution. Why Choose Me: Proven Track Record: I take pride in my track record of delivering projects on time and exceeding client expectations. Effective Communication: Clear and prompt communication is at the core of my work ethic, ensuring a smooth and transparent collaboration. Versatility: My expertise spans both frontend and backend development, allowing me to offer comprehensive solutions tailored to your project's needs. Client Satisfaction: My goal is not just to meet client requirements but to surpass them, leaving clients satisfied with the end result. Let's Discuss Your Project: If you are looking for a reliable and experienced Full-Stack Java Developer with expertise in Spring Boot, Grails, and modern frontend technologies, let's connect. I am eager to discuss your project requirements and contribute to its success.

Hi. I help founders and businesses turn app ideas into real mobile products for Android and iOS. 🤖 I can take ownership of the full technical path: architecture, Android or Flutter, backend integration, Firebase, Supabase, testing, debugging, and release preparation. I use AI tools in my daily workflow to move faster, while I stay responsible for code quality, edge cases, and final delivery. 🚀 Launch your MVP in 2–4 weeks. If you're a startup with an idea, I'll help you scope it down to what actually matters and ship something real — not a prototype that falls apart under pressure. 📱 Build for Android & iOS. Flutter for cross-platform apps with one codebase. Native Kotlin when you need deep Android integration. I can work from your Figma or create wireframes myself using tools like Stitch. 🔄 Bring your iOS app to Android. Already have an iOS app? I build the Android version without reinventing the wheel on design and logic. ⚙️ Add a backend. Java/Spring for custom logic that needs to scale. Firebase or Supabase for faster setup. Either way, it won't cause you headaches later. 🛠️ Fix what's broken — or audit before it breaks. App crashing? I find root causes, not just symptoms. Not sure what state your project is in? I can do a technical audit and give you an honest picture. ⚡ Revive abandoned projects. Half-finished app left by a previous developer? I'm used to picking up messy codebases and turning them into something shippable. 🏆 I've been building mobile apps since 2011 — one of the earliest Android developers, with experience across early-stage startups and enterprise teams. I think about how the decisions I make today will affect your project six months from now. If something looks like a risk, I'll flag it before it becomes your problem. Most of the past 5 years I worked full-time (including a 5-year backend role at a SCA startup). I'm now back on Upwork full-time with 100% Job Success Score. ✍️ If any of this sounds like what you need — just send me a message.

Hi there 👋, I’m Peter. I help startups and businesses build reliable, scalable backend systems using Golang. With 14+ years of software development experience, including 8+ years specializing in Go, I’ve designed and developed production systems used by companies across cybersecurity, fintech, cloud printing, e-commerce, and data platforms. Whether you need a new backend service, REST API, microservice, third-party integration, automation tool, or performance optimization, I focus on delivering clean, maintainable code that is built for production, not just proof of concept. What I can help you with ✅ Golang Backend Development ✅ REST APIs & gRPC Services ✅ Microservices Architecture ✅ Third-party API Integrations ✅ PostgreSQL, MySQL & MongoDB ✅ Redis & Kafka ✅ Docker & Kubernetes ✅ AWS Cloud Services ✅ Performance Optimization ✅ Backend Automation ✅ System Design Why clients work with me I believe great backend software should be: * Reliable * Scalable * Easy to maintain * Well tested * Easy for other developers to understand I communicate clearly, work independently, take ownership, and always aim to deliver solutions that continue to add value long after the initial implementation. Technologies: Programming Languages: Go (Golang) (Primary), Java, Python, JavaScript, Shell Scripting, Node.js, PHP Backend Engineering: Microservices, Distributed Systems, RESTful APIs, gRPC, Event-Driven Architecture, Serverless, Concurrent Programming Cloud Platforms: AWS (Lambda, EC2, S3, Cognito, DynamoDB, SNS, SQS, CloudWatch, CDK, EMR), DigitalOcean Databases & Caching: PostgreSQL, MongoDB, MySQL, Redis, Cassandra, HBase, SQL, NoSQL Messaging & Distributed Systems: Kafka, RabbitMQ, Hadoop, MapReduce, YARN, ZooKeeper DevOps & Infrastructure: Docker, Kubernetes (Basic), GitHub Actions, Jenkins, GitLab CI, Ansible, Git Observability: Prometheus, Grafana, ELK Stack (Elasticsearch, Logstash, Kibana), AWS CloudWatch Software Engineering: System Design, CI/CD Pipelines, Test-Driven Development (TDD), Agile, Scrum, Code Reviews, Data Structures & Algorithms Frontend (Working Knowledge): Angular, TypeScript, HTML, CSS, Flutter, Figma If you’re looking for an experienced backend engineer who can quickly understand your requirements and build production-ready Go applications, I’d be happy to discuss your project.