An experienced MySQL database engineer with a skillset that expands to Django, Python scripting, Ansible, Linux Administration and various web technologies. I have been a Remote DBA, Support Engineer and Consultant for Percona and Pythian database consultancies, which has enabled me to gain a broad view of huge MySQL installations. You will be able to discover various blog posts I have had published on their respective platforms. I am an established speaker at the global MySQL events on topics including High Availability, Backups and Disaster Recovery, Security and Automation.

I am Sr Database Developer (MySQL/MariaDB) and Sr Full-Stack Developer. My areas of expertise are database-driven application development, database performance optimization, and data processing projects. Examples of projects I worked on: database server configuration/optimization, high-availability database solutions, performance optimization/caching projects, data extraction/mining projects, data migration/import/export projects, multi-threaded data processing projects, web page(s) loading analysis etc. I rate myself as a highly skilled professional. It does not mean I code 2-3 times faster. It means I do things right on first try.

Are your SQL queries running too slowly? Need help with ETL, reporting, or database migration? Looking for a reliable database expert who can solve problems efficiently and deliver clean, accurate results? I help businesses improve database performance, optimize SQL queries, build ETL workflows, and manage safe, accurate data migrations across SQL Server, Oracle, MySQL, and PostgreSQL. I can help with: • SQL query optimization and performance tuning • Stored procedures, functions, triggers, and packages • ETL development and data import/export processes • SQL Server, Oracle, MySQL, and PostgreSQL development • Data migration, validation, and transformation • SSIS, SSRS, and SSMS • Oracle Forms, Oracle Reports, BI Publisher, and Pro*C • Database troubleshooting, cleanup, and optimization I focus on practical solutions that improve speed, accuracy, and reliability. My goal is not just to write SQL, but to solve the business problem behind it. Why work with me? • Strong expertise across multiple database platforms • Oracle Certified Professional (Developer Track) • Master’s degree in Computer Science • Detail-oriented and quality-focused • Clear communication and dependable delivery I can support one-time fixes, ongoing database work, ETL projects, reporting solutions, and migration tasks. Let’s discuss your requirements and find the right solution for your project.

12 Years of total IT experience and work with 27 Customer End including 20 Gov. and Private Bank in Bangladesh, 6 other corporate clients. Vast exposure to IT Infrastructure Management space. Domain expertise on Oracle Database, Security, Solaris (UNIX), SPARC and x86 System. Successfully managed multiple projects involving Implementation and Production Support (Oracle Exadata, Oracle RAC, Oracle Data Guard, Linux Cluster, Solaris Cluster, Oracle Database Appliance, Oracle Advance Security, Audit Vault, Thales nShiled, Thales Payshield, Oracle SUN SPARC and x86 System etc.). Having extensive subject matter expertise in IT Operation Management, Strategic Technology & Developing Cost Effective Solutions to meet customer / business requirements.

🏆 Top Rated Plus (Top 3%) Upworker - 12+ Years Experience I help businesses simplify operations, save time, and increase efficiency by building custom web applications, ERPs, CRMs, MIS, and dashboards. What I offer: ✅ Custom ERP & CRM systems with multi-user, multi-location dashboards ✅ Management Information Systems for 100+ to 500+ employees ✅ Telemedicine, Clinic, Hospital & POS platforms ✅ Complex reports, analytics & workflow automation ✅ Scalable, secure, responsive, and user-friendly solutions Why clients hire me: 12+ years in Full-Stack PHP development (Core PHP, Laravel), Expert in Database Design & Optimization, REST APIs, Frontend & Backend architecture 100% Job Success, 5-star ratings, $100k+ earned, 50+ projects delivered End-to-end delivery: Design -> Development -> Deployment → Maintenance Industries served: Education, Healthcare, Retail, Real Estate, SaaS Let’s discuss your project - I deliver high-quality solutions that exceed expectations.

Hello, Thank you for checking out my profile. Here is a quick overview of my skills & strengths, I am Software Architect well organized, dedicated, energetic, hardworking, efficient and self motivated. Education: I have Master in Software Engineering Degree and Bachelor in Computer Science & Information Technology( CSIT . Seeking for the challenging job from the reputed organization where I can use my skills, knowledge and experience for the company’s progress and benefit. Over the last 18 years, I have designed ERP, DFD, ERD, GUI, process modeling & developed a wide range of database software using Oracle database, Oracle Forms and Reports, Oracle Apex, BI Publisher, Power BI, SQL Server, MySQL, Postgres, FileMaker Pro in home and abroad. I am confident I would make a valuable and immediate contribution to your operations. My technical skill are as follows: Domain Competency : * 18+ years of HealthCare domain experience. * 12+ years of Pharmaceutical, Manufacturing, Supply Chain, and Financial domain experience. * 03+ years of Bank, Oil & Gas, Education, Association domain experience. * 01 + years of Trade, Digital Marketing, and Distribution domain experience. * 01 years of Real Estate Industry, Hotel, and Tourism domain experience. Technology Expertise: 01: Database Experience: Oracle Database7-11g R2,12C, 18c,19c, Autonomous database, Oracle Application Server10g, Developer suite 10g, Oracle Form/Report/Query Builder, Warehouse Builder 10g( ELT, ETL, Cube and Dimensions), Oracle Discoverer, Oracle BI Publisher Desktop, Oracle BI Publisher 10g,Oracle web logic, PL/SQL, Oracle XE 11g, MS SQL Server 2008, MySQL, Postgres, Filemaker pro, MS Access.5000+ Reports & pages development experience using Oracle, APEX, Oracle BI Publisher, Microsoft Power BI and Developer Suit. 02: Web Programming Language: Java Script, jQuery, Bootstrap, Ajax,VB Script, ASP,DHTML, Jasper- Crystal Report, HTML, XML,WML,CSS, JDeveloper 11g,ADF,Tomca,, Tomcat, PHP, WordPress, joomla, Oracle APEX 3,4,5 to APEX 21.1 03: Programming Language: C, C++, Java 04: Operating System: DOS, Windows Server, Red Hat Linux 05: Application Program: Ms Office, 360, MS Visio 2003, SmartDraw. TALLY, Quick Books, STAAD, TOAD,SPSS,STATISCA,Sage MAS,Arcview,Arc GIS,ProBank, PCbank,Wincor Nixford banking Software. Application Server.MS Project, Putty, FTP,UML. Balsamiq Mockups, Pencil, yFiles, ER/Studio. Trello, jira,p-tracker, Monday.com. 06: ERP: mPharma ERP, mhealthcare ERP, Oracle EBS, Openbravo, OpenERP, Orangehrm, 07: Hardware: Assembling, Troubleshooting, BIOS Setup, Server configuration(HP,DELL,IBM),Toshiba,Compaq,Dell,Asus Laptop Setup 08: Networking: Network Cabling, Device Setup, Protocol & Service Setup, Server Configuration-Domain Registration in Win NT Server 4.O, Windows Server 2000/2003. Network Troubleshooting, Network Maintenance, Proxy Server, Firewall, Switch, Router Configuration. 09: Cloud System: Oracle Cloud, Amazon Cloud-AWS, hostmonster.com Publication: 1) Cloud Application Development- Oracle Apex link are as follows rokomari dot com/book/207906/cloud-software-development-oracle-apex?fbclid=IwAR1Xfwqa8n9n3vK8OMp0g0B20C5eJSCmpFXR4gqCuRmyNlcuQNNui1zAPwY 2) Business Intelligence BI - Oracle BI Publisher, Microsoft Power BI rokomari dot com/book/268513/oracle-bi-publisher 3) Journal ijsecs.ump.edu. my/index. php/archive/17-v4/74-ijsecs-04-0044 4) //globaljournals. org/GJCST_Volume18/5-Rework-and-Reuse-Effects.pdf Membership: :Bangladesh Computer Society Membership ID: AM05212. Bangladesh Software Testing Board

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, MongoDB, Oracle , and SQL Server, 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/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!

I am a US-based Senior PHP & WordPress Developer with 14+ years of experience building, optimizing, and troubleshooting high-performance web applications, SaaS platforms, and e-commerce systems. Since 2011, I’ve helped startups, agencies, and established businesses launch, maintain, and scale their websites—with hundreds of successful projects completed across PHP, Laravel, CodeIgniter, WordPress, WooCommerce, and custom backend systems. I specialize in solving difficult technical problems and improving the stability and performance of existing platforms, including: ✔ Backend Development (PHP / Laravel / CodeIgniter / Drupal) 🔹 API development & integrations 🔹 Authentication, OTP, admin panels 🔹 Cron jobs, queues, logic debugging 🔹 Building secure, scalable backend systems 🔹 Custom PHP development & legacy code modernization 🔹 Payment gateway and third-party API work ✔ WordPress & WooCommerce Expertise 🔹 Custom plugins & theme development 🔹 WooCommerce customization & API integrations 🔹 Database optimization, speed tuning, caching 🔹 Troubleshooting complex site issues 🔹 Migrations, fixes, redesigns, and enhancements ✔ Full-Stack Web Development 🔹 PHP, JavaScript, jQuery, Ajax, JSON, JQuery, ReactJS, VueJS 🔹 Bootstrap, Tailwind, HTML5/CSS 🔹 SaaS development 🔹 Dashboard and UI/UX improvements ✔ Server & Infrastructure Troubleshooting 🔹 VPS / cPanel / Cloudflare / AWS Lightsail / Azure 🔹 Fixing crashes, downtime, SSL, DNS, redirects 🔹 Email deliverability, PHP mailer fixes, MySQL errors ✔ Database & Performance Optimization 🔹 MySQL indexing, query optimization 🔹 High-traffic site improvements 🔹 Fixing slow sites, 500 errors, memory issues ✔ Payment Gateways Integration 🔹 Stripe, PayPal, Braintree, Square, Authorize.net, Klarna ✔ Integrations, APIs & Data Feeds 🔹 REST API development & third-party API integrations 🔹 IDX / MLS real estate data feed integration & customization 🔹 Twilio (SMS, Voice, OTP), Sinch 🔹 Mailgun (Transactional Email) 🔹 Webhooks, automation workflows, custom API endpoints ✔ DevOps & Version Control 🔹 Git, GitHub, Bitbucket, GitLab, JIRA 🔹 Docker for containerized development

I bring 17 years of hands-on experience and expertise in managing, optimizing, and automating complex IT infrastructures. My professional journey has spanned diverse technologies, from database administration to DevOps, monitoring tools, and scripting, ensuring that I deliver reliable and efficient solutions tailored to client needs. Key Expertise Areas: 1. Database Administration: • MySQL, MariaDB, and Percona Server for MySQL • Galera Cluster for high availability • Advanced backup and recovery solutions with Xtrabackup • Query optimization, performance tuning, and Orchestrator for MySQL replication management 2. Load Balancing and Proxy Management: • Expertise in ProxySQL and HAProxy for scalable and high-performing systems 3. Containerization & Orchestration: • Proficient in Docker and Kubernetes for deploying and managing applications in scalable, containerized environments 4. System Administration: • Linux and Windows system administration • Automation using tools like CHEF and Ansible for configuration management 5. Monitoring & Alerting Tools: • Skilled in setting up and maintaining Zabbix, Grafana, Icinga, Nagios, Prometheus, and Loki for real-time system monitoring 6. Scripting & Automation: • Bash and Python scripting for task automation, monitoring enhancements, and custom solutions Why Work with Me? • Proven Track Record: Over 17 years of successfully solving complex challenges and delivering impactful results • Versatility: In-depth knowledge across diverse technologies and platforms • Client-Focused: Tailored solutions to meet unique business requirements, with a strong emphasis on reliability and performance If you’re looking for a dependable expert to optimize your databases, manage your systems, or implement scalable DevOps solutions, I’m here to help. Let’s discuss how I can bring value to your project!

🌟 Expert-Vetted Talent - Recognized in Upwork's top 1% of Talent ✅ Established Track Record of Hours and Earnings 🚀 Fastest Response Times 💯 100% Job Success Awarded by Clients 🔝 Top Rated Plus by Upwork, Freelancer and Agency 🔎 Searching for New Opportunities and Problems to Solve Hello and welcome, thank you for considering me for your project. My Upwork profile’s stats clearly demonstrate both my expertise and the value I add to every team that brings me on. The thousands of hours clocked on this platform alone speak to my years of experience in Software Development, and the total earnings shows a glimpse of how valuable that time has been for clients. I am available and ready to answer specific questions about your project’s current problem, next opportunity, or my fit for it. Shall we get to work? Send a message or an invite now and I will be right with you. 𝐖𝐡𝐲 𝗖𝗹𝗶𝗲𝗻𝘁’𝘀 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞: 1. 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗮𝗻𝗱 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: Decades of experience bring a deep understanding of various languages, frameworks, platforms and tools, common and uncommon pitfalls, and alternative solutions. 🗯️ “He was very responsive to our messages and explained what was needed in our project clearly. He is definitely an expert in his work.” 2. 𝗘𝗳𝗳𝗲𝗰𝘁𝗶𝘃𝗲 𝗣𝗿𝗼𝗯𝗹𝗲𝗺 𝗦𝗼𝗹𝘃𝗶𝗻𝗴: I have a proven track record and knack for solving complex problems and providing customized solutions for specific business needs and challenges. 💭 “Isaac was able to quickly discern what I needed and delivered…” 3. 𝗦𝘆𝘀𝘁𝗲𝗺 𝗩𝗶𝗲𝘄 𝗮𝗻𝗱 𝗖𝗼𝗺𝗽𝗿𝗲𝗵𝗲𝗻𝘀𝗶𝗼𝗻: Years of experience and diverse projects have helped me accumulate a broad set of skills and tools. I use this experience to the advantage of my client’s projects in not only accomplishing tasks, but in advising and consulting on potential challenges and opportunities. 💬 “LIFE SAVER!!! I have now use(d) Issac for two separate jobs now and will be bringing him on for some regular hours. Hopefully we get some funding and I can do even more with him. GREAT DEVELOPER” 𝐌𝐲 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: Python|Django|PHP | MySQL | Laravel | WordPress | CodeIgniter | ExpressionEngine | CSS | HTML | JavaScript | Express.js | React.js | Bootstrap | PostgreSQL | NoSQL | Linux | Apache | Nginx | API | Git | SVN | Amazon Web Services | AWS EC2 | 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝗜 𝐎𝐟𝐟𝐞𝐫: 𝐅𝐫𝐨𝐧𝐭 𝐚𝐧𝐝 𝐁𝐚𝐜𝐤-𝐄𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Planning, Design, Documentation, Coding, Testing, Debugging, Deployment, Monitoring, and Maintenance. 𝐒𝐲𝐬𝐭𝐞𝐦 𝐀𝐝𝐦𝐢𝐧𝐢𝐬𝐭𝐫𝐚𝐭𝐢𝐨𝐧: Cloud infrastructure Design, Deployment, Optimization, Maintenance, Scaling, Recovery and Backup, Troubleshooting, and Cost Management. 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 Management: Architecting, Optimization, Monitoring, Recovery, Updating, and Merging. 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭: Planning, Project Requirements, Task Detailing, Developer Support and Feedback, Problem Resolution, Progress Monitoring, Qualification Testing, and Stakeholder Communication.