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I have helped companies to develop (robust software) and quality according to what has been requested and within the established deadline. I like working teams, I am interested to help my coworkers as well to learn with them. I have been working with software development for 20 years inside educational companies, banking and the Federal government. Also, I already worked giving support at managing application servers (JBoss) and databases (Oracle, Postgres, Firebase). Through this way, I manage to improve my knowledge in this area. Therefore, I participated in a partnership with a startup android mobile development directly back end part. I develop Delphi system Client/Server, web applications .net com c#, modern web in Java applications (Jakarta EE / java 8) and angular utilizing concecpts of back end and front end, gather respectively through APIs REST. Skills - Developer Delphi, c#, Java, Angular, PL/SQL. - Scrum, Redmine, Integrations, Web services, REST. I look forward to making your schedule and helping you with your project. Please, send me an email or text me.

⭐⭐⭐⭐⭐ “Davi was outstanding to work with! He was always faithful to deadlines, extremely accessible, and demonstrated a deep expertise in Python and SQL.” I’m a Top Rated Plus senior full-stack engineer focused on building and improving SaaS platforms, internal business systems, APIs, AI-powered workflows, search products, and data-intensive applications. 𝗦𝗼𝗺𝗲 𝗻𝘂𝗺𝗯𝗲𝗿𝘀 𝗳𝗿𝗼𝗺 𝗮 𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺 𝘄𝗶𝘁𝗵 𝟭.𝟰𝗠+ 𝘂𝘀𝗲𝗿𝘀: • Migrated 100+ production queries to a new data warehouse, reducing average execution time from 190 seconds to 2 seconds • Built an Elasticsearch search-relevancy pipeline with cross-encoder reranking, improving relevancy from 80% to 96% through iterative benchmarks • Automated a reporting process that previously required two hours of manual spreadsheet work and reduced it to five minutes 𝗪𝗵𝗮𝘁 𝗜 𝗰𝗮𝗻 𝗵𝗲𝗹𝗽 𝘆𝗼𝘂 𝗯𝘂𝗶𝗹𝗱 • SaaS platforms, internal tools, CRM and ERP systems • AI automation, OpenAI and Anthropic integrations, agents and intelligent workflows • Operational dashboards, client portals and approval systems • REST APIs, third-party integrations and business-process automation • Semantic search, data pipelines and application performance improvements 𝗖𝗼𝗿𝗲 𝘁𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 Python, Django, FastAPI, Node.js, React, Next.js, TypeScript, PostgreSQL, Supabase, Elasticsearch, BigQuery, Redis, Docker, AWS, GCP, OpenAI and Anthropic. I approach projects with both the technical architecture and the business objective in mind. I scope the work upfront, identify risks early, explain trade-offs clearly, and break larger systems into realistic phases and milestones. Whether you need to build a new product, modernize an existing application, improve a slow system, automate a manual workflow, or integrate AI into your platform, I can help turn the requirements into reliable production software. Send me a message with your current challenge, and I’ll help you identify the most practical next step.

I am a Senior GIS Developer and Spatial Data Engineer with over 12 years of experience bridging the gap between geographic science and advanced software architecture. I specialize in building, deploying, and maintaining robust open-source backend systems for complex spatial challenges. My core technical stack includes: - Backend & APIs: Python, FastAPI, Flask - Spatial Databases & Servers: PostGIS, GeoServer, PostgreSQL - GIS Engines & Desktop: Google Earth Engine, QGIS - DevOps & Infrastructure: Docker, Linux server configurations, VirtualBox How I can help your project: - Custom GIS Web Systems: Developing end-to-end spatial mapping applications for routing, geocoding, and real-time data synchronization. - Automated Spatial Analysis: Building systems to automate environmental diagnostics, historical data extraction, and complex spatial queries. - Logistics & Tracking Data: Structuring robust database architectures for transport logistics and route tracking operations. - Infrastructure Deployment: Setting up local and production server environments to ensure your spatial data is fast, secure, and scalable. I don't just run GIS tools; I write the code and build the architecture that makes spatial data work for your business logic. Let's discuss how we can optimize your spatial infrastructure.

Java Developer with 15+ years of experience and a postgrad in Software Engineering. Focused on back-end development with Spring/Spring Boot, especially in microservices and system architecture. I help clients build scalable, reliable software that drives real business results. Most of my work has been through outsourcing, contributing to a wide variety of projects for clients in e-commerce, finance, ERP, and more. I adapt quickly to different teams and domains, always aiming to add value from day one. I'm used to handling the full dev cycle — from planning and coding to testing and deployment. I follow clean code practices, SOLID principles, and clean architecture to ensure long-term maintainability. Writing well-tested, high-quality code is something I genuinely care about.

🚀 Experienced Software Engineer | Java, Spring & Kotlin Specialist | Oracle-Certified | 10+ Years in Web & API Development Hi, I'm Daniel — a passionate software engineer with over a decade of hands-on experience in designing, developing, and delivering robust solutions using Java, Kotlin, Spring Boot, and RESTful APIs. I’m also Oracle-certified and have contributed to a wide range of successful projects across industries, from startups to large enterprises. 💻 Tech Stack Highlights Java, Kotlin, Spring Framework (Boot, MVC, Security) Angular & React for modern web interfaces AWS for cloud infrastructure JasperReports for reporting solutions PostgreSQL, MySQL, and other RDBMS AI Agents (Augment, Cortex) 🌐 My background includes full-stack development (Desktop and Web), integration with cloud services, and leading feature development in agile environments. Whether it's building scalable microservices, modern APIs, or intuitive UIs, I bring technical depth and adaptability to every project. ✅ Open to remote opportunities ✅ Fluent in English and Portuguese ✅ Strong communication and teamwork

Senior Backend Engineer (Java/Spring Boot) specialized in FinTech & Payments. I build and modernize production systems with a reliability/security mindset (idempotency, retries/timeouts, resilience, reconciliation, safe rollouts). What I can help you with: - Payment/Banking integrations (ACH/Wire/Card/Crypto rails), webhook-driven flows, edge cases & reconciliation - Legacy modernization → modular services/microservices (Clean Architecture/DDD when it fits) - API design (REST, versioning, backward compatibility), event-driven services (Kafka/MQ) - Performance & scalability (PostgreSQL tuning, caching with Redis) - CI/CD + cloud deployments (Docker, Kubernetes/OpenShift, AWS), production troubleshooting & RCA - MCP (Model Context Protocol) Server integrated into an n8n pipeline to feed and power a chatbot, enabling automated conversational workflows. Tech: Java, Spring Boot, PostgreSQL, Redis, Kafka, AWS, Docker, Kubernetes, Jenkins.