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I'm a Senior Software Engineer with nearly 20 years of experience building, troubleshooting, modernizing, and scaling production systems across backend, frontend, cloud, and DevOps environments. My strongest areas are Java/Spring Boot, C#/.NET, Python, Node.js, enterprise APIs, distributed systems, cloud infrastructure, and DevOps. I also work extensively with Angular and Vue on complex business applications. I have hands-on experience with enterprise platforms and business-critical workflows, including Odoo, NetSuite, ERP integrations, data and ETL pipelines, payment-related systems, fintech workflows, operational platforms, and systems where data accuracy, permissions, reliability, and auditability are critical. I'm particularly effective when a project is technically complex: an existing system needs to be understood quickly, production issues are difficult to isolate, performance is degrading, integrations are failing, architecture needs improvement, or a team needs a senior engineer who can take ownership without constant direction. My core engineering stack includes Java/Spring Boot, C#/.NET and ASP.NET Core, Python/Django/Flask/FastAPI, Node.js/TypeScript, Angular, Vue, PostgreSQL, MySQL, Redis, Kafka, REST APIs, microservices, AWS, Docker, Kubernetes, and CI/CD. Beyond development, I'm strong in production debugging, performance optimization, database and API troubleshooting, authentication and permissions, distributed workflows, cloud deployments, infrastructure, legacy modernization, and release engineering. I've also worked with enterprise integration and automation scenarios involving ERP systems, synchronization pipelines, external APIs, background processing, financial data flows, payment-related logic, and multi-step operational workflows. I use modern AI-assisted engineering tools extensively, including Claude, Cursor, GitHub Copilot, and ChatGPT. I use them for code analysis, debugging, refactoring, test generation, architecture review, documentation, change-impact analysis, and development acceleration. I also work with LLM integrations, RAG, OpenAI APIs, Anthropic APIs, and AI-enabled backend systems. Recent Upwork projects include Spring Boot/PostgreSQL performance troubleshooting and backend/data-pipeline consulting. My completed contracts maintain a 100% Job Success Score with 5-star client feedback, including recognition for senior-level problem solving, code quality, reliability, and ownership. I'm a strong fit when you need someone who can: - Take ownership of an existing production system - Build or modernize backend services and APIs - Diagnose difficult production and performance problems - Work across Java, .NET, Python, or Node.js systems - Build and support Angular or Vue enterprise applications - Integrate Odoo, NetSuite, ERP, payment, and fintech workflows - Design and troubleshoot databases, Kafka, and data pipelines - Work across AWS, Docker, Kubernetes, CI/CD, and production environments - Modernize legacy applications and integrations - Add AI capabilities to existing software - Work independently with technical and product teams If the problem crosses application code, APIs, databases, business workflows, infrastructure, deployment, or architecture boundaries, that is exactly the kind of engineering work I specialize in.

Most AI features don't fail because of the model. They fail because the backend was never designed for non-deterministic systems. I've spent 12 years building Java and Spring platforms for banking, telecom, healthcare and retail — systems where an outage is an incident report, not a bad day. For the last two years I've been putting LLM agents inside that same class of system and keeping them running. That is the work I do: AI inside platforms that already have auth, audit trails, PII rules, SLAs and someone on call. What that looks like: — Digital banking on Backbase DBS: arrangements, transactions, limits and maker-checker approval matrices. Spring Cloud Gateway, OAuth2/OIDC, saga patterns for money flows that cannot end half-done. — A five-service telecom platform on GCP implementing TMF standards. Cloud Run, Spanner with SCD-2 history tables and a transactional outbox, Pub/Sub with dead-letter queues, customer PII tokenized through Cloud DLP with versioned HMAC keys, secrets moved out of environment variables into Secret Manager. — An agent platform I built and still operate: WhatsApp and voice agents on AWS Lambda, DynamoDB, EventBridge and SQS FIFO. Real constraints, not a sandbox — per-portfolio messaging limits, template category audits, error codes you must never retry, a one-second turn budget on voice, and a cost per conversation that has to stay below what the customer pays. How I work: I treat an agent like any other distributed system. Every prompt or model change ships as an experiment: a regression bank of replayed real conversations, canary promotion, and a config fingerprint on every logged run — because "the prompt got better" is not a claim you can defend without one. I use AI to write code and I review every line of it at the boundaries that matter: schemas, money, auth, and anything that deletes. Those it does not touch unreviewed. I work in English with distributed teams across the US and Latin America, from Bogotá. If you are adding AI to a platform that already has customers, compliance and an on-call rotation, that is the problem I solve. 12 years of enterprise backend development. I've built: → A loan processing engine for a banking platform — retail and corporate lending workflows, credit decisioning APIs, multi-stage approval pipelines → A custom eSign web application — full design and development, then seamless feature expansion for a returning client → A serverless inventory management system on AWS (Lambda + DynamoDB + API Gateway + Cognito) → Clinical documentation systems handling care gap detection across 31 medical categories I specialize in the kind of backend work where getting it wrong is expensive: financial services, healthcare, compliance-heavy domains. Systems where you need someone who thinks about edge cases before they become production incidents. Tech stack: Java 8/11/17 · Spring Boot · Spring Security · Spring Batch · Spring Data JPA · Hibernate · PostgreSQL · MySQL · Oracle · DynamoDB · Apache Kafka · Docker · REST APIs · AWS (Lambda, EC2, ECS, S3, Step Functions, API Gateway) · OAuth 2.0 · JWT · CI/CD (Jenkins, SonarQube) · 90%+ test coverage (JUnit 5, Mockito) 100% Job Success. Every project delivered on scope. Every client rated me 5 stars on communication and quality. Based in Colombia (EST-aligned). Fluent English and Spanish. Available 30+ hrs/week. I respond within hours, not days. Looking for a Java backend developer, Spring Boot specialist, or AWS microservices engineer? Let's talk about your project.

Hey! Robin here. I help business owners integrate AI technologies into their workflows. Check out my 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗰𝗮𝘁𝗮𝗹𝗼𝗴 for budget-friendly, self-hosted AI solutions fine-tuned to your specific needs. ● 𝗔𝗯𝗼𝘂𝘁 𝗠𝗲 Hi, I'm Robin — a Mechatronic Engineer who was drawn to the “dark side” of software development early in my career. Always striving to stay up to date, I've gained real-world experience with most of today’s popular software development technologies (full list below). I take time to understand both the business goals and the technical requirements of your project before writing a single line of code. This ensures you're paying for solutions that truly work, pushing your project in the right direction with every sprint. I'm not the kind of freelancer who just completes tasks for the sake of getting paid. I've been working as a software developer since 2006 and on Upwork (formerly oDesk) since 2012. Freelance projects here put food on my table, so you can expect full dedication. I only take on one job at a time and always aim to respond quickly. I'm online during standard office hours, Monday through Saturday, and my time zone is GMT-5 (same as New York) year-round. ● 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 Ongoing (Back-end Developer) Vagrant, RESTful 2018–2020 (Java Web Development) Spring Boot, JSF, PrimeFaces, JAXB, JAX-RS, SQL Server 2008 2017–2018 (JavaScript Mobile) Node.js, Express, React Native, iOS, Xcode, Blockchain 2013–2017 (PHP Web Developer) PHP 5, MySQL, Laravel, Lumen, AWS EC2, AWS RDS, AWS CodePipeline, AWS Elastic Beanstalk, Cloud9 IDE, GitHub, Bitbucket 2012–2014 (Java Desktop and Web) J2SE, Struts, Derby DB, MySQL, JDBC, Hibernate, Jasper Reports, NetBeans, Tomcat 2009–2012 (.NET Web Developer) Visual Studio 2008–2010, ASPX, ADO.NET, Silverlight, MVC (.NET), WCF, ADO.NET Data Services, MS SQL Server, Oracle, SVN, Scrum 2007–2009 (Windows Desktop Software) Borland Delphi 6, MS SQL Server 2000, Oracle, Firebird, JEDI Version Control System, PMP/Waterfall methodologies 2006–2007 (Hardware–Software Integration) C/C++, Borland Builder 5 & 6, OLE DB, ADO components

I have 9+ years of experience developing software for several projects, from academic/research applications to industrial systems with thousands of users. My core strengths are related to web development for large systems using Java, SpringBoot, ReactJS, AWS, and SQL. I also develop applications for mobile and embedded devices using ReactNative and Java/JavaFX.