Hire the Best Apache Struts 2 Freelancers in Karachi, PK

A Certified IT professional freelancer on Upwork specialized in Microsoft SQL Server Database Administrator (DBA), IBM webMethods API Gateway, Integration Server, Universal Messaging, Developer Portal, Command Central Implementations and Administration, Oracle database administrator, Oracle Middleware Weblogic Administrator, Oracle EBS, Oracle Hospitality Micros E7, RES 3700, Oracle utilities Customer Card and billing technical and functional support (CC&B / CCB / MDM / WAM, MWM, NMS and OUA). Oracle Simphony POS implementation and support, Oracle Hyperion, Windows and Linux system administrator, IT Helpdesk and technical Support. I have worked on several different jobs with 100% 🏆reliability and long term repeated clients in the following; ✅ 24/7 | Remote | Call | Operational support. ✅ Microsoft Server Implementation and Administration Support. ✅ Microsoft SQL Database Administration. ✅ Server Administration including Windows / Linux / OEL. ✅ Oracle Products Implementation, Administration, critical, security patching and support. ✅ Backup and Disaster Recovery of Oracle Database using RMAN. ✅ Designing Oracle DR site using Dataguard. ✅ Implementation and Support of IBM webMethods, API Gateway, ESB, Integration Server, Universal Messaging, Command Central, Developer Portal, SoftwareAG Products. ✅ Oracle EBS Technical and Administration Support. ✅ Oracle Fusion Middleware Implementation and Administration Support Weblogic / OHS / SOA / OSB / BPM / Integrated JDeveloper / Forms & Report/ LDAP integration with Fusion Middleware. ✅ Tomcat Apache Middleware Administration. ✅ Performance Monitoring and auditing support. ✅ Upgrade / Migrate Database and Fusion Middleware. ✅ Support Amazon AWS Services. ✅ Schedule Performance Monitoring and administration task for your business. ✅ Training and Management. SKILLS: 🔶 Microsoft SQL Database Administration. 🔶 Oracle Database Administration 🔶 MySQL Database Administration. 🔶 Oracle Forms & Report Configurations. 🔶 Oracle FMW Weblogic Administrator. 🔶 24/7 for Mission-Critical Environment Support. 🔶 Technical & Help Desk Customer Support. 🔶 Oracle EBS Administration. 🔶 Microsoft SQL, Oracle products critical patching. 🔶 SQL DB Backups, IMPDB / EXPDB, RMAN Incremental Level 0 and Differential backup & recovery. 🔶 Oracle utilities Customer Card and billing technical and functional support (CC&B / CCB / MDM / WAM, MWM, NMS and OUA). 🔶 Oracle Micros E7 POS complete support. 🔶 Oracle Micros RES 3700 POS implementation and support. 🔶 Oracle Simphony POS implementation and support. 🔶 Oracle POS RVC, Touchscreen, MI, Deals, Combo, Reports, EOD/SOD, Reports, database Designing staff training and support. 🌟 WHY YOU CONTACT ME OVER OTHER FREELANCERS? 🌟 🏆 Upwork employer’s excellent satisfaction feedback. 🏆 I have hands-on experience more than 8+ years in relevant products. 🏆 Officially certified in products cum having Master’s Degree in Computer Science. 🏆 Maximum availability for your mission-critical environment 🏆 Providing functional team support for your products. 🏆 Pay after your satisfaction. ✉ Do you have any urgent query or requirements? Kindly open PMB and feel free to contact!

Having 10+ Years of experience as a Full-Stack Java/J2EE Web Developer with diversified exposure in analysis, design, development and implementation of web-based applications. Extensive knowledge of Java SE including Collection, Threading and Core Java. Good experience on Java EE technologies such as Servlet, JDBC, JSP, JSTL and JNDI. Strong programming skills in designing and implementing multi-tier applications using web-based technologies like Spring MVC and Spring Boot. Strong knowledge of Microservice Architecture using Spring Boot and Spring Cloud. Excellent knowledge of Spring Core such as Dependency Injection, Annotations and XML based Configurations. Hands-on experience with Spring AOP using Advice, Aspects and AOP Processor. Extensively worked on Spring JDBC, Spring Hibernate ORM and JPA. Proficient at designing dynamic web applications using HTML5, CSS3, JavaScript, jQuery, AJAX, JSON with responsive web applications using Bootstrap. Strong knowledge of Angular practices in commonly used modules and creating reusable Components, Pipes and Services. Strong experience using MAVEN Build System. Experienced working with technologies such as Log4j, and I18N. Good experience in developing applications with SOAP and RESTFul Web Services. Proficient at design, developing of web-based applications using Apache Tomcat 7.0/8.0/8.5, GlassFish 4.0. Good Knowledge of Amazon Web Service (AWS) EC2, SQS, SNS, Lambda Expert at handling Unit Testing using JUnit, Jasmine, and Karma. Expertise in database technologies such as MySQL 5.6/5.7, Oracle 10g/11g/12c, MS-SQL 12. Experienced in version control tools like GIT and ticket tracking platforms like JIRA. Expertise in project documentation such as E-R Diagram, UML modeling. Experience working on Software Development Life Cycle (SDLC) with a blend of proficiency and leadership in AGILE-SCRUM. Good technical abilities and skills developed by determining work ethic and self-learning.

Need a secure, scalable backend that doesn't buckle under pressure? High-growth fintech and enterprise platforms require more than just code—they require ironclad security and seamless integrations. Whether you are scaling a banking app or migrating to a microservices architecture, I build the robust systems that keep your business running 24/7. How I add value to your project: Fintech-Grade Security: Expert in OAuth2, JWT, and WSO2 (APIM/MI/IS) to ensure your data and APIs remain uncompromised. Proven Scalability: Integrated Tier-1 banks (Standard Chartered & JS Zindagi) into the Zong App, handling millions of potential transactions. Full-Stack Efficiency: Bridging the gap between complex Java/Node.js backends and high-performance React/Next.js frontends. Key Achievements: Reduced Latency: Optimized API monetization systems, improving response times by 30%. Seamless Integration: Successfully deployed secure payment gateways for 5+ enterprise-level financial services. Certified Expertise: WSO2 Certified Developer—ready to handle complex API Management and Identity Server tasks. Expertise in: Java Spring Boot, Node.js, React.js, Next.js, Angular, MySQL, and MongoDB. Ready to discuss your technical roadmap? Click the "Message" or "Invite" button, and let’s build a solution that scales with your ambi

I'm a Principal Software Engineer with over 10 years of experience building backend applications using Java and Spring Boot. Most of my work has been on enterprise products where reliability, scalability, and clean architecture matter more than simply getting features delivered. I've designed and developed microservices, REST APIs, authentication systems, and event-driven applications for industries including retail, logistics, construction, identity management, and enterprise SaaS. I enjoy working on complex backend problems, whether it's designing a new service, improving an existing system, or troubleshooting production issues. My core expertise includes: • Java (8, 11, 17, 21) • Spring Boot, Spring Security, Spring Data JPA • Microservices Architecture • REST APIs and third-party integrations • PostgreSQL, MongoDB, MySQL, Redis • Kafka and asynchronous messaging • Docker, Kubernetes • AWS (EC2, S3, RDS, IAM) • Keycloak and OAuth2/JWT authentication • GitHub Actions, GitLab CI/CD • Performance optimization and production support Over the years I've worked on systems serving thousands of users where stability, security, and maintainability were critical. My approach is to understand the business problem first and then build solutions that are easy to maintain and scale. I also have extensive experience reviewing code, mentoring developers, improving application performance, and resolving production issues. Whether it's optimizing database queries, reducing API response times, refactoring legacy code, or designing a new microservice, I focus on delivering solutions that work well in production. If you're looking for someone who can contribute beyond writing code, communicate clearly, and take ownership of backend development from design through deployment, I'd be happy to discuss your project.

I help organizations design, fix, scale, and modernize Elastic (ELK) Stack deployments for Elastic Security (SIEM / EDR), Observability, and high-volume search use cases. I’m a 2× Elastic Certified Engineer with hands-on experience delivering 200+ Elastic Stack implementations across enterprise and mid-size environments - handling terabytes to petabytes of data with performance, reliability, and cost efficiency in mind. If your Elasticsearch cluster is slow, unstable, oversized, undersized, or just confusing - I’m the person you call before it becomes a business outage. What I Do Best 🛡️ Elastic SIEM & Security 1. End-to-end Elastic Security deployments 2. SIEM architecture, log onboarding, detection engineering 3. Use case development (MITRE ATT&CK aligned detections) 4. Integration with firewalls, EDR, AD, cloud platforms, and custom apps 5. SOC dashboards, alert tuning, and noise reduction 6. AI Assistant and Agentic / RAG Workflows 📊 Observability & APM 1. Full-stack observability using Elastic APM, Metrics, Uptime, and Logs 2. Distributed tracing & performance bottleneck analysis 3. Kubernetes, microservices, and cloud-native monitoring 4. OpenTelemetry integrations 5. SLO/SLA dashboards for operations teams 6. AI Assistant and Agentic / RAG Workflows 7. SNMP Monitoring of network devices 🔎 Elasticsearch for Search & Analytics 1. High-performance search architecture 2. Index design, mappings, and query optimization 3. Relevance tuning & large-scale data modeling 4. Kibana dashboards, reporting, and executive visualizations ⚙️ Elastic Stack Architecture & Engineering I don’t just “install ELK.” I engineer platforms that stay fast and stable under real load. 1. Cluster design (hot/warm/cold/frozen tiers) 2. Scaling strategies & shard optimization 3. Index Lifecycle Management (ILM) 4. Performance tuning & troubleshooting 5. Upgrade planning and zero-downtime migrations 6. Elastic Cloud, ECE, ECK, and self-managed clusters 7. In depth fine tuning for Elasticsearch, Logstash, Kibana 🔄 Data Pipelines & Integrations 1. Advanced Logstash pipeline engineering 2. Elasticsearch ingest pipelines & data enrichment 3. Elastic Agent, Beats (Filebeat, Metricbeat, Winlogbeat, Auditbeat, etc.) 4. Kafka, databases, APIs, and custom log sources 5. Data normalization, parsing, and ECS alignment 🤖 Advanced Use Cases 1. Elastic + Machine Learning 2. AI-powered search and RAG pipelines using Elasticsearch 3. Anomaly detection for security and operations 4. Executive dashboards and business intelligence use cases 5. AI Assistant and Agentic / RAG Workflows 🔁 Migrations to Elastic I help organizations move away from expensive or limited platforms and into scalable Elastic architectures: Splunk → Elastic QRadar → Elastic SIEM OpenSearch / OpenDistro → Elasticsearch Solr → Elasticsearch 🧠 Why Clients Hire Me ✔ I focus on architecture and long-term scalability, not quick fixes ✔ I speak both technical and business language ✔ I design systems that reduce infrastructure cost and alert fatigue ✔ I’ve seen (and fixed) almost every common Elasticsearch mistake 💬 How I Can Help You New Elastic Stack implementation SIEM or Observability deployment Cluster performance issues Scaling or redesigning architecture Version upgrades Health checks and optimization reviews Proof of Concept (PoC) development If your Elastic environment is mission-critical, let’s build or fix it the right way. Send me a message with your current setup and challenges - I’ll help you map the best path forward.

I help beginners, students, and working professionals learn Java, Python, C#, Go, JavaScript, backend development, and SQL through hands-on, real-world projects. In parallel, I work as a Java Application Support Engineer (L2/L3) on a large-scale ERP system, where I handle production issues, debug complex problems, and ensure system stability in live environments. What I Can Help With Development & Teaching: • Java, OOP, Spring Boot, REST APIs • Backend development and system design fundamentals • SQL (MySQL, PostgreSQL) • Data Structures and interview preparation Java Support / Production Support / Technical Support: • L2/L3 application support for Java-based systems • Production issue debugging (logs, APIs, database) • Root Cause Analysis (RCA) and bug fixing • Performance issue identification and optimization • Incident and ticket handling with SLA adherence • Microservices debugging and API troubleshooting • Log analysis (Splunk, Kibana, New Relic) • SQL query optimization and database troubleshooting Why Clients Choose Me: • 100% Job Success | 700+ hours on Upwork • Hands-on experience with large-scale production systems • Strong debugging and analytical skills • Clear, structured, and practical approach to problem-solving • Reliable communication and timely delivery Availability: Available 30+ hours per week.