Hire the Best Apache NiFi Developers

Greetings! Lex here, an AWS Architect. Let me ask you: did you have it all on Upwork? Contractors who go offline for days without notice? Contractors ruined your production environments? Contractors knowing what you need better than you? Contractors who don't have a clue about a single thing written on their profiles? This is how I am different. ⭐️ I am always on for you. My response SLA is minutes. Not hours. Not days. ⭐️ My consulting style is gentle and non-invasive. You always have the final say. ⭐️ I am a narrow specialist: AWS is the only thing I sell here, but be certain that I am the best in my league. This is some of thing I do best: ✅ Web and mobile cloud-native microservice and serverless architectures (AWS) ✅ Cloud solutions cost reduction ✅ External API providers and COTS systems integration using Apache Camel and n8n ✅ Data pipelines, ETLs, ELTs ✅ Bespoke technology assessments ✅ Fully autonomous AI agents My Technology Background ✅ Industry-standard enterprise Java stack: Spring Boot, Hibernate, Apache Camel ✅ Experience with Apache Kafka, ElasticSearch, Redis ✅ Exposure to front-end stack and paradigms: Angular, React, micro-frontends, SPAs ✅ Data stores: PostgreSQL, MySQL, MongoDB ✅ Cloud providers: Amazon Web Services ✅ Standards and protocols: OpenAPI, REST, Json RPC, GraphQL, Mambu, n8n

I help healthcare organizations design, fix, and deliver real-world interoperability solutions - not just theoretical HL7/FHIR/IHE implementations. With 15+ years of hands-on experience, I've built and deployed integrations across HL7v2, HL7v3, C-CDA, FHIR, and IHE for more than 50 organizations worldwide. I work directly at the message level - transformations, mappings, validation, conformance, and troubleshooting - using tools like Mirth Connect, Apache NiFi, and Smile CDR. Many clients come to me when: • integrations don't work as expected • FHIR implementations become too complex • HL7 mappings break across systems • conformance and validation issues block go-live I don't just advise - I build, debug, and deliver working solutions. What makes me different • Author of HL7 v2/v3 specifications and profiles • Contributor to early HL7 FHIR (STU3) • Primary author for Canadian Core/Baseline FHIR profiles • published books and multiple training courses on HL7/FHIR • All HL7 certifications + IHE + SNOMED CT training up to Authoring Level 1 I work at the intersection of specification and implementation - where standards meet real systems. What I can help you with: • HL7v2 / HL7v3 interface development and troubleshooting • FHIR API design, profiling, and implementation • HL7v2 ↔ FHIR transformations (ADT, ORU, OML, etc.) • FHIR ↔ OMOP transformations • C-CDA parsing, generation, validation and C-CDA ↔ FHIR transformation • Integration engine development (Mirth Connect, Apache NiFi) • Conformance testing and validation (HL7v2/v3, FHIR, C-CDA) • Fixing broken integrations and production issues • Implementation Guides (IG), FSH, SUSHI • IHE / HIE integrations (XDS, XCA, XCPD, etc.) Technical stack: • FHIR (R4, STU3), HL7 v2/v3, C-CDA, IHE • Mirth Connect, Apache NiFi, Smile CDR, Aidbox • Java, JavaScript, Python, React, SQL, XML, XSLT, Schematron • Touchstone, Simplifier, Forge, IG Publisher AI & Automation (Applied to Healthcare Interoperability) • Multi-agent AI workflows for healthcare data transformation and validation • LLM-assisted HL7/FHIR mapping and interface documentation • AI-driven data quality analysis and anomaly detection in healthcare messages • Automation of conformance testing and validation workflows using LLM-based agents • Use of AI tools to accelerate implementation guide development and integration debugging Certifications • HL7 FHIR Advanced Developer • HL7 FHIR Foundational Implementer • HL7 FHIR R4 Proficiency • HL7 v2 Control Specialist • HL7 CDA Specialist • HL7 v3 RIM Specialist • IHE Certified Professional • SNOMED CT Terminology Services Let's work! If you need someone who understands both the standard and the implementation, I can help you move faster and avoid costly mistakes.

It was the most important moment of my 13+ years of career. It was when I realized that there is always a trade-off in technology. You have to do something intentionally bad in order to succeed as a Small Medium Business in the Digital Transformation. And 70% fail because they insist on doing this very thing well. A while back, when I finally landed a job in a corporation, I was excited that I was going to use state-of-art technology. But, one of my first features immediately added some bugs. As I fixed those bugs, I introduced another, but also other bugs started to pop up caused by previous developers. In laymen terms, it is like a Rubik’s cube. As you carry on assembling the second face, you may accidentally mess up the first bit. It wasn’t like that when I started my career in technology in the civil service a long time ago. Yes, I was frustrated because we used old boring technology. But, we didn’t have to put out the fire all the time because that limited technology prevented us from getting in this position. Coincidence or not, the easiest way to solve the Rubik’s cube is putting constraints. If you move towards, you have to move backwards at some point. Fast forward to nowadays, some of my clients want to create highly customized User Experience. As the project starts to grow, hyper customization introduces more complexity. Then, you make a small change and get unexpected results. You didn't account for all the complex consequences. And this happens again and again, and you can’t avoid it. The software had become brittle. You start to miss deadlines or have to hire more developers to fix cracks faster, and eventually I get hired. That’s the time I have the hard talk: don’t bite more than you can chew, stop chasing the perfect User Experience (good User Interface is not a problem though) with a small team. If a BigTech didn’t have to hire thousands of engineers to provide that, they certainly wouldn’t. Anyway, User Experience is only noticed by B2C clients, and this is where Big Techs thrive. In B2B or internal tool software, who pays for the software won’t even use it. Hey, my name is João, I’m a software architect and developer, feel free to send me a message asking how I can make your business grow. What technologies do I work with? The simple ones: HTML, CSS, Bootstrap, Bash, XML, PostgreSQL, Apache Camel, Apache Knowledge Is Everything, Keycloak. If you need a hypercustomized solution, I can decently program in Java, Python and JavaScript, though. If you have any doubts, don’t hesitate to contact me.

I am a Senior Automation & Integration Engineer with 20+ years of experience designing, implementing, and operating enterprise integration and automation solutions across heterogeneous environments. My background combines traditional enterprise middleware with modern low-code / no-code automation platforms, allowing me to bridge legacy systems with cloud-native and SaaS ecosystems. I have extensive hands-on experience working with IBM Integration Bus, IBM App Connect Enterprise (ACE), IBM MQ, and IBM DataPower, delivering reliable, secure, and scalable integration architectures. In parallel, I have led and executed integrations using Oracle Service Bus (OSB) and Oracle SOA Suite, applying enterprise integration patterns, message mediation, and service orchestration best practices. On the open-source and API management side, I have deep expertise with WSO2 Enterprise Integrator / Micro Integrator and WSO2 API Manager, including gateway configuration, policy enforcement, mediation flows, data services, and API lifecycle management. More recently, I have focused on automation and workflow orchestration using n8n and make, building end-to-end workflows that integrate APIs, SaaS platforms, webhooks, and AI-driven processing. This combination of enterprise-grade middleware and agile automation tools enables me to deliver efficient, maintainable, and business-oriented integration solutions. I am strongly focused on reliability, performance, and observability, with solid experience in troubleshooting, JVM tuning, message flow analysis, and production support across complex integration landscapes.

I am a senior software developer and architect (Total- 21 Yrs.) in Java/J2ee, Python, Rest API, SOAP API, javascript, OAuth, SSO, React, Redux, Angular, Kafka, SpringBoot, JPA, Cloud, AWS, Azure, Private cloud, JBPM, n8n, Oracle BPM, JMS, Hibernate, Struts, Spring Batch, ESB, Base44, Playwright, Selenium, JavaFX, Lisp, Prolog, Weka , OpenAI, Different Web as well as Application Servers, different Operating Systems and DBMS Tools, SQL, NoSQL, PostgreSQL, Mongo, Cassandra, MYSQL, Oracle, Supabase, AI, NLP, OpenAI, agent development, Wordpress, php , CI/CD, Agile and various open-source tools, technologies and frameworks. Some of the domains I have worked on are Banking, finance, Trade, Crypto, HR, Insurance, Learning, NLP, Healthcare, System architecture, Developers Tooling, Document management, AI, DevOps, Cloud, etc. ********************************************************************* Experience Summary: Freelancing || Freelancing || Present Toyow, Mumbai || Solution Architect || Sep 24 to JAN 25 JPMorgan, Mumbai || Vice President || Jun 15 to July 24 and May 10 to Jun 13 || (Around 12 Yrs.) Deloitte, Mumbai || Senior Consultant/Specialist Senior || Jun 13 to Jun 15 HCL Technologies || Onsite/Offshore Dev lead || Sep 06 to May 10 Birla Soft Ltd || Software Engineer || Jan 06 to Sept 06 GIIT, Gr. Noida || Developer || Feb 05 to Oct 05 ************************************************************************* Some of the applications are as below which I have developed/contributed. - Document generation system - Online translation system using NLP - Library management system - HRMS System - Networking system - Tools for Developer and Operate to build and deploy their applications. - Workflow as a service - Workflow Platform for Mutual Fund NAV processing (Fund accounting) - Prediction analysis for SLA miss. - A real time dashboard for fund processing - Messaging Platform supporting MQ, SFTP, REST, Kafka, FIX, - Trade instruction manager - Customer support system for Bank operators - Platform for Tokenization Assets using Blockchain - A social Media application - A insurance management Platform - Applications developed on Base44 - Loan record reports - OCR for healthcare reports and data processing. - ChatBot for Patient enquiry - Coin analysis using AI (openAPI integration)

🏆 Top-Rated Database Architect & Multi-Cloud Specialist with 16+ Years of Experience Delivered 50+ enterprise-scale database and cloud transformation projects across telecom, government, banking, retail, and transport industries, specializing in migrations, HA/DR architectures, and performance tuning for Oracle, PostgreSQL, MySQL, SQL Server, MongoDB, Redis and Apache Cassandra. I am a seasoned Database Architect and Cloud Specialist with over 16 years of experience, delivering high-impact solutions across telecom, government, banking, transport, and retail industries. My expertise spans multi-database ecosystems (Oracle, PostgreSQL, MySQL, SQL Server, MongoDB, Redis) with a strong focus on performance tuning, HA/DR architectures, and enterprise-scale migrations. Beyond databases, I bring deep experience in multi-cloud environments (OCI, AWS, Azure, GCP) and DevOps practices, leveraging Kubernetes, Docker, Ansible, Jenkins, and CI/CD pipelines to design and automate resilient, scalable infrastructures. Over the years, I have led critical modernization projects including Oracle RAC/Data Guard, PostgreSQL Patroni clusters, MySQL InnoDB clusters, SQL Server Always-On, and GoldenGate microservices replication, all aligned with compliance, cost optimization, and business continuity. I specialize in cloud-native architectures, database modernization, and containerized deployments, ensuring secure, high-performing, and future-ready platforms for enterprises across multiple sectors. 🔹 Database Expertise High Availability & DR: Oracle RAC/Data Guard/GoldenGate, PostgreSQL Patroni/repmgr/EFM, MySQL Group Replication/ClusterSet, SQL Server Always-On, MongoDB ReplicaSets & Sharding, Redis Sentinel & Cluster. Performance Tuning: Advanced SQL optimization, query indexing, connection pooling, and OS-level tuning (CPU, memory, I/O, networking). Clickhouse DB optimization and performance tuning. Migrations: End-to-end cross-platform migrations (SQL Server → Postgres/Oracle, MySQL → Snowflake/OCI/Azure, on-prem → multi-cloud). I have hands-on experience designing and implementing Oracle Fusion API integrations using Oracle Integration Cloud (OIC), connecting Fusion Cloud with multiple external systems. My work includes building and optimizing REST and SOAP-based services, handling complex data mappings, and improving integration performance and reliability. I’ve also maintained existing integrations to ensure high availability and seamless data flow while collaborating closely with cross-functional teams to identify needs, streamline workflows, and deliver well-documented, reusable integration solutions. Automation: Backup/recovery orchestration, PITR, monitoring, and administration via shell scripts, Ansible, Jenkins, and IaC. 🔹 Cloud Architecture Certified in OCI, AWS, Azure, GCP, and Alibaba Cloud, with deep experience in hybrid & multi-cloud setups. Skilled in OCI Exadata Cloud@Customer, AWS RDS/Aurora, Azure SQL Database, Databricks, and multi-region failover. Migrated enterprise systems (DB + middleware) to cloud with zero-downtime cutovers and automated DR. 🔹 DevOps & Modern Platforms Proficient with Docker, Kubernetes, and OpenShift for containerized DB + application deployments. Extensive experience in building, optimizing, and maintaining Oracle Integration Cloud (OIC) processes, adapters, and orchestration for enterprise-scale clients. VBCS (Visual Builder Cloud Service): Skilled in designing and developing responsive, low-code applications integrated with Oracle SaaS and PaaS ecosystems. Strong background in CI/CD (Jenkins, GitLab, Ansible, Terraform). Experience securing secrets with Vault, integrating monitoring stacks (Prometheus, Grafana, ELK). 🔹 Odoo & Application Layer Odoo deployment, backend DB optimization, and module customization. Report building & tailoring business workflows for performance and usability. Tomcat, Apache, IBM WebSphere, Oracle WebLogic, and Bitnami stack administration. 🔹 Data & AI Solutions Data Engineering & Warehousing: Azure Data Factory, Databricks, Oracle OBIEE, Snowflake. AI Agent Development: Built agents for self-healing DBs, N8N automation, and natural language querying. Supabase Consultation: Connect Supabase with AI agents to simplify backend management for non-developers. Automate project provisioning, query execution, function creation, and API management. Enable natural language interaction with data, making database operations accessible to entire teams. ✅ Key Certifications: Oracle 19c OCP DBA | PostgreSQL Advanced v11 | MySQL 8.0 OCP | MongoDB Associate DBA | Redis Certified Developer | Microsoft Azure Administrator | OCI 2025 Certified Multicloud Architect | OCI GenAI | Oracle GoldenGate Implementation Specialist | WebLogic 12c OCP | YugabyteDB DBA