Slow databases? Production outages? Performance bottlenecks affecting your business? I help organizations identify root causes, optimize database performance, and build reliable database platforms. I am a senior database administrator (DBA) with over 13 years of hands-on experience managing production database systems. I specialize in MySQL, MariaDB, PostgreSQL, SQL Server, MongoDB adn Oracle, providing database troubleshooting, incident response, daily operations and maintenance, performance optimization, and reliable backup, high availability, and disaster recovery solutions for mission-critical environments. 🔍 Database Expertise: With over 13 years as a senior expert in MySQL/MariaDB/Percona/PostgreSQL/MongoDB/Oracle/SQL Server/DuckDB, I’ve managed over 5000 databases and 300 TB+ of data. My experience covers database architecture, performance optimization, backup and recovery, High availability, disaster recovery, and much more. I ensure every database solution I deliver is robust, scalable, high performance, and perfectly aligned with your business needs. 🛠️ Technology Stack: MySQL/Percona (Versions 5-9) MariaDB (Versions 5-12): Installation、High Availability, Replication, and Scalability Solutions、InnoDB Cluster、Group Replication、Workbench/Shell/Router、Backup & Restore、Galera Cluster、Percona XtraDB Cluster、XtraBackup、Toolkit、InnoDB/MyISAM/Binlog、Orchestrator、replication-manager. PostgreSQL (Versions 7-18): Installation、High Availability, Replication, and Scalability Solutions、SQL Tuning、pgpool-II、PostGIS、TimescaleDB、ClickHouse、Patroni、Citus、pgvector、Security、Supabase、Neon. MongoDB (Versions 3-8) / MongoDB Atlas : Installation、MongoDB Shell (mongosh)、Aggregation、Indexes、Atlas、Time Series、Change Streams、Replication、Sharding、Storage、Administration、Security. SQL Server (Versions 6.5 – 2025): Installation、High Availability and Disaster Recovery (Always On AG, FCI, Log Shipping, Replication)、Distributed Availability Groups、SQL Server Management Studio / Azure Data Studio / sqlcmd、Backup & Restore、Failover Cluster / Always On Solutions、PowerShell dbatools / First Responder Kit、Storage Engine / Transaction Log / Change Data Capture. Other Database : Oracle、DB2、Redis、SQLite、DuckDB、DocumentDB Cloud service providers: AWS RDS、AWS Aurora、Amazon DocumentDB、GCP、Azure、N8N creator. Certifications: I hold certifications from Cisco, Oracle, MySQL, AWS, ITIL, PMP, and TOGAF, ensuring I bring industry-recognized expertise to every project. 📈 Why Choose Me? Proven Experience: Worked for leading ICT and IoT solution providers, supporting major operators, banking, and financial enterprises. End-to-End Solutions: From designing high availability architectures to delivering query optimizations and backup solutions, I offer complete database management expertise. Training & Support: I also provide course training for companies looking to empower their teams with database-related skills. 🤝 Let’s Collaborate: If you’re looking for a seasoned database professional to tackle challenges in MySQL, PostgreSQL, MongoDB, Oracle, or other database technologies, let’s discuss how I can help streamline your operations and enhance performance. 📩 Contact Me: I’m ready to dive into your project. Reach out, and let’s unlock the full potential of your data infrastructure together!

Hello, I'm Soni, an EDB PostgreSQL Certified Professional (the highest level of PostgreSQL Certification from the most reputable PostgreSQL Certification provider). I have 12+ years of experience in the computer industry, 10+ years of proven track record on Upwork, top-rated plus, 100% job success score, mostly spent my career as a PostgreSQL DBA and Database Developer. - Expert in providing smart business solution, cost effective, profitable and timely manner to give best service in industry with guaranteed satisfaction. - Strongly motivated professional participated in multiple projects, and effective co-worker. Over the last 11 years, I have managed and developed a wide range systems in database solutions such as : common database administration (advanced query, stored procedure, reporting, view, trigger and function, backup and restore, etc), database system automation, data migration, database testing, database replication and clustering using Pgpool-II, Slony, Pacemaker and Postgresql Streaming replication, disaster recovery, database system monitoring, database maintenance, Business Intelligence using Looker, Amazon Redshift database, data reporting using Jasper Report and many more. My current job also includes : crond, enterprise linux administration, cloud service, mongodb, sSMTP, server clustering, DRBD, Pacemaker, Corosync, Heartbeat, and many more. I also have some experiences in the following areas: Wordpress, PHP, HTML, CSS, javascript, VB, C# programming. All service will be delivered with 100% satisfaction guaranteed.

A seasoned Software Developer with strong expertise in C#, .NET, Desktop Application Development, SAP Crystal Report, Database Design, Development and Administration. I have over 11 years professional experience in several database management systems including MS Access, MSSQL, MySQL, PostgreSQL and DB2. With a proven track record of delivering high-quality software solutions, I bring a wealth of experience to your projects. Here's what I bring to the table: Technical Proficiency: ✅Expert in C#, .NET development, I have a deep understanding of the language and its frameworks, ensuring robust and scalable applications. ✅Proficient in SAP Crystal Report, MSSQL, MS Access, MySQL, PostgreSQL, and DB2, I am adept at designing and optimizing database structures for maximum efficiency. ✅Over 11 years of experience in performance tuning, log shipping, replication, mirroring, SSIS, SSRS, stored procedures, triggers, etc. ✅Guru in writing the most complex SQL queries on SQL Server, MySQL, IBM DB2, and PostgreSQL. Full-Stack Development: I am experienced in full-stack development, allowing me to create end-to-end solutions that seamlessly integrate frontend and backend technologies. Skilled in front-end technologies such as HTML, CSS, and JavaScript, ensuring a cohesive and responsive user interface. Problem Solving and Innovation: I thrive on solving complex problems and enjoy taking on new challenges. My analytical mindset allows me to identify issues quickly and implement effective solutions. Constantly staying updated with the latest industry trends, I bring innovative ideas to the table, enhancing the overall quality of the projects I work on. Collaborative Team Player: Having worked on various collaborative projects, I understand the importance of effective communication and teamwork. I am adept at working with cross-functional teams to achieve project goals. Client Satisfaction: I am committed to delivering solutions that not only meet but exceed client expectations. My goal is to ensure the success of your project by providing high-quality, reliable, and maintainable code. If you are looking for a Software Developer who can bring a wealth of technical expertise to your team and deliver top-notch database driving solutions, I am ready to contribute to the success of your projects. Let's discuss how I can help you achieve your goals.

As a Database Administrator (DBA) with over 10 years of experience, I specialize in providing robust, efficient, and secure database solutions for businesses of all sizes. My expertise spans SQL Server, MySQL, PostgreSQL, and cloud platforms like Azure SQL and Azure Managed Instance. I ensure optimal performance, scalability, and data integrity while tailoring solutions to meet your specific needs. • Skilled in managing SQL Server (2008 to 2022), MySQL, PostgreSQL, and Azure SQL environments. • Performance Tuning: Optimizing server performance through configurations, indexing strategies, and resource allocation. Query optimization for stored procedures, views, and functions. • High Availability & Disaster Recovery: Expertise in implementing solutions like Always On Availability Groups, Log Shipping, Replication, and Clustering. • Database Migration & Upgrades: Hands-on experience with cross-platform migrations, including Oracle, MySQL, PostgreSQL, Access, and cloud platforms like Azure Managed Instance. • Backup & Recovery: Proficient in designing reliable backup strategies for large databases (VLDBs) exceeding 100GB and ensuring fast recovery. • ETL Development: Extensive experience in building and troubleshooting SSIS packages for data extraction, transformation, and loading. • Reporting Services: Developed and optimized reports using SSRS to support data-driven decision-making. • Skilled in T-SQL scripting for automating maintenance, monitoring, and troubleshooting tasks. • Successfully managed 100+ database instances with high availability and performance requirements. • Experienced in managing SAN storage solutions for large-scale database environments. • Proficient in Security and Compliance, including user management, auditing, CDC (Change Data Capture), and Change Tracking. • Dedicated, reliable, and adept at resolving complex issues while meeting tight deadlines. • A proactive problem-solver with a passion for tackling challenging database scenarios and delivering high-quality solutions.

Need a Python Data Engineer who can build reliable ETL pipelines, automate business workflows, optimize databases, or develop production-ready backend applications? I'm a Python Data Engineer with 4+ years of experience designing ETL pipelines, workflow automation, backend applications, and database solutions for healthcare and utility organizations. I specialize in building scalable systems that improve data quality, automate manual processes, and support business-critical operations. My technical expertise includes Python, SQL Server, PostgreSQL, Django, Flask, Pandas, Selenium, REST APIs, ETL development, and workflow automation. I have worked on large-scale data processing, reporting systems, database optimization, and machine learning solutions for forecasting and analytics. Here's how I can help: • Build scalable ETL pipelines and automated data workflows • Design, optimize, and maintain SQL Server and PostgreSQL databases • Develop backend applications using Python, Django, and Flask • Build REST APIs and integrate third-party services • Automate repetitive business processes using Python • Extract, clean, and transform data from websites, PDFs, Excel files, and enterprise systems • Develop reporting systems, dashboards, and data processing solutions • Develop and integrate machine learning models for forecasting and business analytics. Why clients choose to work with me: ✔ Strong experience in Python, ETL, databases, and workflow automation ✔ Production-ready, clean, and maintainable code ✔ Reliable communication and on-time delivery ✔ Business-focused solutions that improve efficiency and reduce manual effort ✔ Long-term support for existing and new projects Whether you need a custom ETL pipeline, backend application, database optimization, workflow automation, or a complete data processing solution, I'm ready to help deliver a reliable and scalable solution. Let's discuss your project and find the best approach to achieve your goals.

Production Supabase and PostgreSQL backends for SaaS founders. Auth, RLS, Stripe billing, Next.js APIs, and AI integrations that ship clean and hold up under real traffic. Recent client: "Rare at any price point." I specialize in the backend layer most full stack generalists avoid: multi tenant row level security, complex PostGIS schemas, and the production hardening that makes a codebase safe to hand to the next developer. I also run my own SaaS that processes 1M+ property listings nightly, so I build around founder constraints, not just engineering ideals. On my current education platform contract I act as technical lead across a multi contractor team: I make the schema calls, define the API contracts the other developers build against, and review their work before it ships. What I deliver: • Supabase and Postgres architecture. Migrations, triggers, RLS policies, schema cleanup, multi tenant isolation. • Stripe subscriptions. Webhooks, billing state sync, access control tied to subscription status. • Next.js App Router. Server actions, route handlers, API integration, frontend wiring. • AI features that ship. OpenAI and Claude integration, RAG pipelines, evals, guardrails. • PostGIS and spatial data. Location based schemas, GIS queries, Mapbox integration. • Team integration. I slot in alongside your existing developers, automation contractors, and vendors, and I review code as carefully as I write it. • Production handoff. Passing test suites, documented migrations, docs the next dev can follow. Recent Upwork work, all 5.0: • $9,550 fixed price production backend for a workforce analytics SaaS • Municipal GIS platform: 107 row level security policies enforcing per town isolation, Mapbox field mapping, Playwright test coverage. "Honestly one of the best freelancers I've worked with." • 72 table PostGIS schema with RLS on all 72 tables and 189 indexes, delivered ahead of deadline • Backend package: 18 SQL migrations, 14 Edge Functions, 257 passing SQL tests • Education platform, in progress: Stripe billing, Vimeo gated lessons, bulk school enrollment, technical lead across the client's contractor team Top Rated on Upwork. 5.0 across every contract. I'm best for founders who have a real product or a messy build and need it secure, scalable, and ready for customers. I work async by default: GitHub PRs with context, honest timelines, same day responses during working hours. Send a message and I'll reply within a few hours.

Database Development : ****************************************** Oracle Sql, Plsql, Data Export from Oracle DB to excel MSSQL PostgreSQL AWS Redshift, Glue, S3 GCP BigQuery Snowflake Oracle Forms(D2k) Expertise in Entities like : ------------------------------- Tables, Views, Sql Queries, All Types of JOINS, Cursor, Procedure, Function, Packages, Triggers, Collection, Bulk Collect, Analytical/Window Function, Dynamic Sqls, Pipelined Functions, Sql Loader, External Table, Hints, Bug Fixing , Debugging, Impact Analysis etc. DBA ************** * Having 10+years of experience as an Oracle, MICROSOFT SQL server and Golden Gate administrations in Banking, finance, Healthcare, Multimedia and currently working in Telecom domain. Working in 24x7 environments and providing support. * 6 +Month experience on AWS RDS and EC2 instances. Experience in RAC Implementation, maintenance of Clustered Databases, CRS upgrade, ASM implementation and maintenance. * Hands on knowledge of Golden gate replication and online Migrations tool. * Migration from 11g and 2c to 19c using DBUA Experience in installation & configuration oracle 10g, 11g, 12c and 19c RAC. * Implementation MICROSOFT SQL server 2008, 2012, 2014 and 2016 in development, test, and production environment. Always on replication. * Monitoring MSSLQL Server clustering, Log shipping, mirroring * Having dept knowledge about Oracle and MICROSOFT SQL server patching. * Tested and Implemented different physical and logical backup and recovery methods like point in time, Media recovery, RMAN and EXPDP and IMPDP utility. * Experience in designing Data guard solution and implementation and in managing physical standby. * Experience in monitoring and optimizing the Database performances through tuning using stats pack, AWR, ADDM, explain plan, Backup timings of databases. Having hands-on knowledge Oracle Table Partitions and Materialized Views. * Upgraded/ Migrated MICROSOFT SQL server Instances/Databases from older version MICROSOFT SQL server to new version of SQL Server. Apply SP (Service Pack)/ hot fixes on MSSQL server Instances to address security and upgraded related issues. * Performance Tuning and schedule jobs to automate different database related activities including backup, monitoring database health, disk space, and backup verification. * Extensive knowledge of oracle architecture SGA, PGA, Listener, tns names. * Developed Different Maintenance Plans for database monitoring. Setup Jobs, Maintenance plans for backups. Rebuilding indexes, check server health, alert, notifications Manual, on demand and setup jobs for Database Backup, and design backup strategy. * Experience in Mirroring and Log shipping and managing Standby Databases. * Creating File groups & managing File groups. Creating users and providing proper privileges for Database access. * Memory monitoring and optimizing the Database Performances through Tuning Explain Plan. Experience in Oracle RMAN backup (Full, incremental and cumulative) and recovery, Incomplete recovery and disaster recovery. * Experience in, Maintenance plans for backups, Rebuilding indexes, check server health, alert, notifications Manual, on Demand and setup jobs for Database Backup, and design backup strategy. * Hands-on experience in configuring MSSQL server and Windows system event log entries for warnings. Language : ********************* Python (Pandas, Numpy, Matplotlib, AI/ML, PySpark) Java (Java, Spring MVC, Spring boot, Microservices, Rest-api, React, Angular old version Javascript) ETL: Informatica,ODI **************** 1. Proficient in data integration and ETL processes using Informatica PowerCenter. 2. Extensive experience in designing, developing, and implementing ETL solutions with a focus on Informatica PowerCenter. 3. Demonstrated expertise in creating complex mappings, workflows, and transformations in Informatica PowerCenter to optimize data flow. 4.Proven track record of troubleshooting Informatica PowerCenter workflows. 5. In-depth knowledge of working with various databases and sources like oracle , terafata, flat files to extract, transform, and load data using Informatica PowerCenter. 6. Implemented and maintained data warehouses utilizing Informatica PowerCenter as a key component of the ETL architecture. 7. Proficient in utilizing Informatica PowerCenter for handling large volumes of data. Excel : ************* Advanced Excel Formula, Macro Data Visualization : ************************** Power BI, As a Trainer to Train in SQL Help Students in their SQL Assignments ####################################### Having over 14 Years of experience mainly as a Database Development Expert. Also having hands on experience in above mentioned skill set. Just give a faith for your development activities, I assure you will not be disappointed. Note : Pay after only the satisfaction of work only. Thanks DK Raju

👋 Hi, I'm Raine Sánchez — a Senior Full Stack Web Developer and Database Administrator with 8+ years of experience building scalable, user-friendly web applications and managing complex database systems. 🚀 What I Bring to the Table: 🔧 Full Stack Expertise From front-end frameworks like Vue.js and React to robust backend systems with PHP (Laravel) and Node.js — I handle end-to-end development with clean, maintainable code. 🧠 Database Mastery Advanced PostgreSQL knowledge: performance tuning, replication setup, query optimization, and migration from systems like SQL Server and MySQL. 💡 Problem Solver & Collaborator I enjoy tackling complex technical challenges and collaborating closely with clients to transform ideas into practical, high-quality solutions. 🎯 User-Centric Development I prioritize intuitive interfaces and responsive design to ensure your application works beautifully across devices. 🏆 Key Achievements: Managed PostgreSQL architecture and performance at UNO, including replication and stability across production servers. Developed internal tools for HR, CTI, call analytics, and accounting with PHP (Laravel) and JavaScript. Translated PSDs into high-performance SPAs using Laravel and Vue.js at True Apex. Led full database migration from SQL Server to PostgreSQL at Inmov NA. Improved query efficiency and database reliability at Cloud Defense. I'm passionate about delivering clean, efficient solutions — always on time, and always aligned with your goals. 💬 Let's connect! Whether you're building a new app, optimizing your stack, or need a trusted freelance partner, I’m here to help.

I help teams fix, migrate, and stabilize Supabase/PostgreSQL systems — especially when things are already breaking, inconsistent, or need to scale without risking data loss. I design and run secure, scalable backend systems for real-world data pipelines, including healthcare EDI (837 → 835), Supabase architectures, and production systems where accuracy, reliability, and data protection are non-negotiable. I also build and stabilize AI-powered systems, integrating LLM APIs (OpenAI, Claude) into backend workflows where structured data, validation, and consistency matter — not just prototypes, but production-ready systems. I’ve migrated 50+ standalone databases into a unified PostgreSQL system with zero data loss, handling messy schemas, inconsistent data, and edge cases that typically break systems after deployment. I currently work in a healthtech environment building and maintaining revenue-critical pipelines, including systems that handle protected health information (PHI) in HIPAA-aware environments. This includes AI-assisted revenue cycle management (RCM) workflows, where structured healthcare data (EDI 837/835) is combined with LLM-driven processing while maintaining strict data integrity and auditability. ⸻ What I specialize in: * Supabase systems — schema design, RLS, auth, performance, debugging * Database migration — SQLite, MySQL, legacy systems to PostgreSQL * Healthcare data pipelines — EDI 837/835 workflows, claims and remittance processing * Backend stabilization — fixing inconsistent or failing systems * API integrations and ETL pipelines — ingestion, transformation, validation * AI systems — LLM integrations, structured outputs, and production-ready workflows * AI-built apps — fixing, stabilizing, and taking them to production ⸻ Recent work includes: * Migrated 50+ databases into a unified PostgreSQL system (zero data loss) * Built and stabilized Supabase-backed systems with scalable architecture * Designed and maintained healthcare data pipelines (EDI 837 → 835) * Implemented secure ingestion pipelines (API + validation layers) * Built AI-assisted RCM workflows combining claims (837) and remittance (835) data with LLM processing * Implemented validation layers to ensure AI outputs are structured, consistent, and safe for production use * Fixed and optimized AI-generated applications for production ⸻ I work with sensitive healthcare data where accuracy, security, and reliability are critical, and systems must be designed to handle real-world complexity without failure. If your Supabase project is breaking, your data needs to be migrated safely, or you’re building an AI-powered system that needs to work reliably in production — I can help you get it stable and production-ready.

When your backend goes down, users leave and revenue stops. I make sure that doesn't happen. I'm a Node.js backend developer with four years building and stabilizing production APIs and microservices across Healthcare, FinTech, EdTech, and Real-Time platforms — industries where uptime and data integrity aren't optional. Results I've delivered: — Migrated a live MongoDB database to PostgreSQL with zero downtime and zero data loss, across a 50+ user production system — then rebuilt the backend logic to handle PostgreSQL natively where it had only ever run on MongoDB — Migrated a MySQL database on a live PWA to Supabase PostgreSQL with Row Level Security and proper schema versioning — eliminating data corruption bugs that were wiping user progress, streaks, and financial records on every deploy — Expanded and restructured a PostgreSQL microservices database to support unified authentication across multiple services — users can now sign up, log in, and manage their profile from one platform with one login What I build for clients: API development — High-performance RESTful and GraphQL APIs using Node.js, Express.js, and NestJS, designed to handle load and stay maintainable as your product grows. This is the kind of API work a reliable Node.js backend developer should own end to end. Microservices architecture — Modular, independently deployable services built for scale, with clean inter-service communication and separation of concerns baked in from the start. Database architecture — MongoDB and PostgreSQL schemas structured for speed and long-term integrity, including advanced indexing and query optimization (one recent project cut DB load by 40%+). Real-time systems — WebSockets, live messaging, and presence features built cleanly into your existing stack. Auth & security — JWT, RBAC, OTP flows, and session management done properly from day one. Infrastructure & deployment — Docker, CI/CD pipelines, and automated monitoring so you're never caught off guard. Third-party integrations — Payment gateways, Twilio, and external APIs connected without future maintenance debt. 🧩 Real-World Solutions I've Built as a Node.js Backend Developer: 🏥 Healthcare Data Pipeline Built a Node.js backend processing 1,000+ patient records daily across a distributed system — with zero data loss, role-based access control, and HIPAA-aligned data handling built in from day one. 🏫 Multi-School Platform Backend Architected a modular Node.js microservices backend for EduConnect, serving 10+ schools with complex role hierarchies, tenant isolation, and data scaling — all without touching live service uptime. 🆘 Real-Time Crisis Support API Built the backend for Safe Anchor — a real-time victim support platform using Node.js, WebSockets, and optimized REST APIs, with encrypted communications and secure data handling under strict compliance requirements. ⚡ API Performance Overhaul Diagnosed and resolved bottlenecks across a production API layer — cutting response times by 45% through query restructuring, caching strategy, and connection pool tuning on PostgreSQL. 🗄️ Database Migration & Stability Migrated a live MySQL database on an active PWA to Supabase PostgreSQL — eliminating data corruption bugs wiping user progress and financial records on every deploy, with Row Level Security and schema versioning built in. ☁️ Zero-Downtime MongoDB to PostgreSQL Migration Migrated a live MongoDB database to PostgreSQL across a 50+ user production system with zero downtime and zero data loss — then rebuilt the backend logic to handle PostgreSQL natively from the ground up. If you need a backend that handles load, protects your data, and gives your product a solid foundation that lasts — let's talk to a Node.js backend developer who has done it in production.