I’m a Senior Data & Systems Engineer with 18+ years of experience working in Oracle and SQL Server environments, specializing in performance tuning, query optimization, and backend data solutions. I’ve helped organizations improve system performance by up to 80% by identifying bottlenecks, optimizing queries, and restructuring inefficient processes. Here’s how I can help: ✔ Debug legacy C#/.NET Framework applications and production issues ✔ Troubleshoot ASP.NET/WebForms-style applications, APIs, and JavaScript workflows ✔ Investigate SQL Server stored procedures, queries, application logs, and configuration issues ✔ Deliver controlled bug fixes with regression testing and clear documentation ✔ Optimize Oracle and SQL Server systems for performance, reliability, and scalability ✔ Fix slow SQL queries and resolve database performance issues ✔ Optimize Oracle and SQL Server systems for speed and scalability ✔ Design and improve data workflows and ETL processes ✔ Troubleshoot complex system and data issues quickly ✔ Support API integrations and backend data operations I’ve worked on mission-critical systems in government and enterprise environments, where performance, accuracy, and reliability are non-negotiable. If your system is slow, breaking, or not scaling the way it should, I can help you identify the root cause and implement effective, long-term solutions. Let’s connect and get your systems running the way they should.

Hi, I’m Dejan Keserović, a Senior Full-Stack Software Developer with 5+ years of experience building scalable, high-performing web applications. I’ve worked on a wide range of projects, from high-scale enterprise systems to personal side projects, helping businesses improve their software and streamline processes. I handle both frontend and backend development and take pride in managing projects from start to finish, ensuring smooth and efficient execution. I also have a strong background in database design, with research experience that’s given me a deep understanding of how to structure and optimize databases for large and complex systems. I’ve published several scientific papers on the topic and was also a speaker at the International Conference on Information Systems Development (ISD) 2025. My key skills and technologies include: • Java, Java/JEE, Spring Boot, Spring Framework (MVC, Security, Data) • Maven, Gradle • .NET, C# • React, TypeScript, HTML, CSS • SQL databases: MySQL, MSSQL, Oracle, PostgreSQL • REST API development and integration • Writing clean, efficient, and well-tested code • Project design, testing, deployment, and maintenance • Strong communication and collaboration I’m looking forward to working together!

I am a Java lead developer with over 10 years of commercial background in full circle development. Seasoned in project design and implementation from the ground up using cutting-edge technologies and software solutions. Over the years I've been involved in architecture design, planning, and team management while working on medium, big and large-size projects. I’m always wide open to new opportunities and challenges in work and eager to help customers to meet their business needs.

Greetings! I am economist graduated and magister in digital transformation and leadership. I have 3+ years of experience in Oracle NetSuite ERP as consultant. Suite Foundation Certified. Manufacturing, inventory, demand planning, quality management, advanced procurement, HHRR and purchase specialized. Also specialized in end-to-end implementations, customizations, data migrations, and ongoing support. I am a proactive, analytical, organized professional with the ability to work under pressure. I´ve been working with about 30 projects as leader of modules like manufacturing, purchase, quality management and inventories. These are some tasks that I've been working with and that can be helpful for you: 1. Provide implementation services to new and existing customers. 2. Document and validate customer business requirements and map them to NetSuite functionality. 3. Configure/customize NetSuite application to meet customer business requirements. 4. Work on problems of varying scope where data analysis requires evaluation of numerous factors. 5. Demonstrate good judgment in selecting methods and techniques for acquiring solutions. 6. Translation of customer business requirements into viable business solutions, either as a software solution or as a re-engineering initiative. 7. Work with the customer to configure/customize the NetSuite application to meet their business requirements. 8. Provide clients with consulting and general assistance as needed and be a resource for specific functional areas (P2P, MFG QM and D2B). 9. Lead solution design and implementation aspects of engagements ensuring high quality, integrated software solutions within time and budget constraints. 10. Design solutions for complex business requirements, which may include configuration and/or integration and/or technical components. Services and pricing can be discussed but can include: Customization Implementation Work Data Migration End User Training Walkthroughs Approval Routing Custom Workflows Saved Searches Reports

##Upwork Expert-Vetted - Top 1% of Talent## Heavy experience working NIST 800-53, NIST 800-171, SOC 2, HIPAA, FedRAMP, RMF and CMMC security controls and documentation. AWS architecture and implementation, DevSec(Ops), SDN, Windows/Linux systems administration, ESXi/VMware builds/upgrades, root-cause analysis on infrastructure including networks, enterprise endpoint product test and eval, test case builds. Throughout my 15 years I've seen and touched almost everything. Very efficient, communicative and thorough.

Multi-certified NetSuite professional with 4+ years of experience specializing in ERP administration, systems integration, and workflow automation. Adept at providing expert-level customer support, swiftly resolving complex technical and functional issues, and delivering targeted end-user training to drive system adoption and productivity. I collaborate effectively across cross-functional teams to translate business requirements into efficient NetSuite solutions, ensuring alignment with strategic objectives. Highly detail-oriented and results-driven, I leverage strong analytical skills to develop insightful reporting, dashboards, and data-driven improvements. Committed to continuous learning and professional growth, I consistently explore emerging technologies and best practices to enhance system performance, user satisfaction, and overall business outcomes. improvements. NetSuite: - System Administration (User, Roles, Permission Management) - Familiar with OTC, P2P, and, financial processes - SuiteCommerce MyAccount - SuiteBuilder (Custom Forms, fields, records) - SuiteFlow - Celigo Integrator.io - Saved Searches - CSV Import Certifications: - Certified SuiteFoundation - Certified Administrator

Hello Greetings !! I am organized and goal oriented, with 16 years of experience in CRM technologies along with 10 years professional & proven Salesforce administration and development experience. SPECIALIZATION: I have good exp in salesforce Billing package, I used , taxation, invoiceing, payments, approvals, partial payments, recurring payments, parital invoicing,Auto payments from Banks. I also used CPQ to configure products and quotes. SALESFORCE EXPERIENCE: 1- Salesforce Administration, user administration, security settings, profiles, and roles 2- Salesforce Einstein Reports and Dashboards 3- Salesforce customization using Apex 4- Visualforce Pages customization 5- Integrations with other Systems using REST,SOAP and custom APIs 6- Working experience in Salesforce Lightning 7- Working Exp in Pardot, CPQ and Billing 8- Working Exp in Field Service in Service Cloud, setting Chat, setting Omni Channel 9- Working exp in Sales Cloud 10- Creating custom objects and access control 11- Customization using APEX classes. 12- Data import and export 13- Data migration from pipedrive, hubspot, sugarcrm to Salesforce CRM 14- CPQ Configurator, Billing and payment gateways setup CORE COMPETENCIES : - CRM Development/Deployment/Support - Analytical and Problem Solver - Project Management - Solution Architect - Process Document Creation - Training SKILLS • Salesforce Admin • Salesforce Configuration • Salesforce CPQ and Billing • Profiles, Triggers , Emails • Worked on Apex Classes • Reports and Einstien Reports • Sales and service Cloud • Process Builder and Workflows • Sharing Rules • Permissions Sets • Custom Objects • Client Portals • Roles and Object, field and record level security • Visual force pages • Custom validations • Community Cloud ABOUT ME : - Good at Object Oriented concepts for software design and implementation - Strong knowledge of Web Applications and Web services. - Strong decision making and problem solving skills. - Track record of delivering results with deadlines. DONE WORK: Development Work: 1- I worked in Apex classes and all types of Triggers, Batch Apex, LWC component creation, asynchronous apex 2- I worked in CPQ and used products, Bundles, Product Rules, Price Rules, Product constraints, Quotes, Orders, Subscriptions, Amendments. 3- I used salesforce billing to configure invoice, payments, Dunning, Tax code, Tax Calculations, Proration and autoinvoicing. 4- I Integrated Stripe and Paypal payment method for billing 5- I used Rest and SOAP APIs to integrate Salesforce with quickbook, SAP CRM and External client portals. 6- I worked to customize visual force pages Specialization: I have specialization in CPQ configuration and customization, setting product rules, options constraints and validation methods. I worked on Price Rules used price action and price conditions. I used to create twin fields, set up execution process, also worked on Advance Approval process in CPQ. I worked on Billing package and setup auto billing in client's bank accounts. I used salesforce billing to configure invoice, payments, Dunning, Tax code, Tax Calculations, Proration and autoinvoicing. Cloud Used: 1- Marketing Cloud : Worked on this to setup campaigns and calling systems. 2- Sales Cloud: I used sales cloud to Convert Lead to cash process. 3- Revenue Cloud: I used CPQ and billing package in Revenue Cloud 4- Service Cloud Salesforce Administration work: 1- Worked on to create users, creating profiles. 2- Worked on roles and heirarchy 3- Worked on field level security using profiles 4- Worked on groups also worked on permission sets group

Are you looking for a NetSuite Expert who can bridge the gap between complex business processes and clean, scalable code? With over 5 years of hands-on experience in the NetSuite ecosystem, I help scaling businesses unlock the full power of their ERP. Whether you need a complete system architecture overhaul, complex SuiteScript development, or seamless third-party integrations, I deliver high-performing solutions that optimize your operations and protect your financial data. As a Solution Architect and Senior Developer, I handle everything from high-level consulting to deep technical execution. 🚀 Core Capabilities & Proven Business Solutions: Custom Integrations & Automation: Built robust API integrations (e.g., NetSuite-to-Box, automated Sales Order imports) to eliminate manual data entry and silos. Advanced SuiteScript & UI Customization: Developed tailored NetSuite User Interfaces, dynamic scripts, and custom workflows to match unique business logic. Supply Chain & Logistics Optimization: Configured Item Label Templates in SCM Mobile Printing and streamlined Shipping Label workflows via Ship Central. Financial & Operational Workflows: Designed and deployed multi-level Dunning Letter systems (4 levels), Inventory Management scripts (Zero Out Stock Ledger), and automated Consolidation processes. Business Intelligence & Reporting: Authored advanced Saved Searches, custom Report Builder configurations, and high-level Data Sets to build Live Manufacturing Dashboards for executive decision-making. System Health & Maintenance: Routine NetSuite administration, legacy code updates, troubleshooting, and end-user training. 🛠️ Technical Expertise: Development: SuiteScript (1.0 / 2.x), SuiteQL, NetSuite Custom UI, Advanced PDF/HTML Templates. Modules & Tools: Financials, SCM, Mobile Printing, Ship Central, Saved Searches, SuiteAnalytics. Whether you need a quick, critical code fix or a long-term partner to manage and scale your NetSuite environment, let’s connect to discuss how we can streamline your business operations. Click the "Invite" or "Message" button on the top right, and let’s talk about your project goals.

If your Cloud bill keeps climbing and your release velocity doesn't, that's usually an infrastructure problem, not a team problem. I’m a Senior Cloud Platform Architect and DevOps Engineer with 10+ years building and running production infrastructure across AWS, Azure, GCP, Oracle Cloud, and OpenStack, including Huawei Cloud, T Cloud Public and Red Hat OpenStack/OpenShift. A few concrete examples from my work: • Led core platform operations for T Cloud Public (formerly OTC) across multiple EU regions, improving availability, elasticity, and automation for large multi‑tenant environments • Built and operated DevOps and SRE platforms for AI products on AWS and Azure (EKS, ECS, ECR, RDS, S3, DynamoDB), including CI/CD, observability, and incident response • Delivered carrier-grade telco/NFV‑oriented Cloud solutions on OpenStack and OpenShift under strict reliability and performance requirements • Cut cross-cloud infrastructure costs by 35%, reduced deployment times from weeks to hours through end-to-end automation, and lowered production incident recovery (MTTR) by 60% With Top Rated Plus status and a 100% Job Success score, I've completed numerous projects, including Cloud Migrations, AI deployments, Integrated systems, Automation strategies, and Infrastructure optimization initiatives for enterprise clients. For Data-heavy projects, I build pipelines with Databricks and Azure Data Factory to handle ETL, orchestration, and service integration. AI and automation are becoming an increasingly important part of the work I do with clients. I help teams move beyond “AI in a notebook” by wiring the AI models and agents into real, production-grade infrastructure with proper CI/CD, testing, monitoring, and deployment flows, so AI workloads are treated like first-class production services, not just prototypes or POCs experiments. What I actually do for clients: • Design and migrate multi-cloud or hybrid infrastructure (AWS, Azure, GCP, OCI, OpenStack) • Build CI/CD pipelines and infrastructure-as-code with Terraform, Ansible, GitHub Actions, GitLab, and Jenkins • Stand up and run production Kubernetes, i.e. Helm, ArgoCD, and Istio, on cloud or bare metal • Build data pipelines with Databricks, Azure Data Factory, and Kafka for ETL and service integration • Move AI/ML workloads out of notebooks and into real production systems, with proper CI/CD, monitoring, and deployment, not a script everyone's afraid to touch I'm AWS, Azure, and Oracle Cloud certified, and I'm just as comfortable lower in the stack, KVM, QEMU, Ceph, SR-IOV, NFV, Proxmox, VMware, which matters if your setup includes private cloud or anything telco-adjacent. I work directly with founders and engineering leads. I'll tell you straight if something's a quick fix or a real project before I quote it, and I document what I build so your team isn't stuck depending on me to keep the lights on. If your infrastructure's a mess, your pipelines keep breaking, or your cloud spend doesn't make sense anymore, message me with what you're working with. I'll give you a real read on what's wrong and what it'd take to fix it.

🏆 18 Years in Cloud & Enterprise Tech | Currently @ AWS in GenAI Partnerships 🏆 💼 Production AI Systems Built on AWS Bedrock, Claude, n8n, OpenAI, Zapier & GHL💼 ⚡ Working Automation in Week One. Real Results in Week Two. Not a 6-Month Project 🚀 Send me an invite or message, I'll give you a free Loom audit showing exactly how I'd automate your biggest time drain. That's my promise. I help SMBs replace manual, repetitive work with AI agents and automated workflows that actually run in production. Whether you're losing revenue to missed calls, watching senior staff chase documents, or trying to make AI do real work in your business, I build systems that drive output and ROI, not slick demos that fall over in week two. Automation that performs. I build production AI and workflow systems across n8n, Make, Zapier, and AWS serverless. Proper error handling, monitoring, and a focus on the operational metrics that actually move your bottom line response times, no-show rates, conversion, revenue recovered. Architecture that scales. Most "AI automation experts" learned this stuff last year. I've spent 18 years across cloud ecosystems and currently work at AWS in GenAI partnerships. Access to the latest tools Bedrock, Kiro, Quick, Connect, Lex, Glue. Same engineering rigor, applied to WhatsApp bots, lead pipelines, and the glue code holding your stack together. Build it right, build it once. Full-stack automation. Scoping, architecture, build, deployment, handover, each stage needs different thinking. I design systems end-to-end that move work through your business, from inbound lead to qualified meeting, from missed call to recovered revenue. Data-driven delivery. I track throughput, response times, API costs, error rates, and ROI on every automation I ship. You get clear reporting showing what's working, what's not, and what we're doing about it. You own everything built code, workflows, and infrastructure. HAPPY CLIENTS: ⭐⭐⭐⭐⭐ "Missed calls were costing an HVAC company in Phoenix real jobs. Every missed call now triggers a WhatsApp follow-up within seconds: product questions answered, the lead qualified, the CRM updated automatically. Built on n8n with WhatsApp Business API, monitoring and error logging from day one, in production without daily input." WhatsApp automation, HVAC company, Phoenix, USA. ⭐⭐⭐⭐⭐ "A UK accounting firm needed client calls handled when nobody could pick up. An AI voice receptionist now answers through VAPI, extracts caller intent, creates the contact and opportunity in GoHighLevel, and sends the caller a personalised voice reply on WhatsApp within 90 seconds of hanging up." AI voice receptionist, accounting firm, UK ⭐⭐⭐⭐⭐ "Emagination Cloud's ops team was digging through raw JSON logs to diagnose failed transactions. Built them an AWS Bedrock agent: plain-English answers via Athena analytics plus Lambda and S3 forensics, delivered with Terraform. Their words: "Everything looks GREAT! The AWS components operate exactly as expected and the updates to the Terraform files are perfect I'm super happy with both the quality and turnaround time." Emagination Cloud, USA. Contract verifiable below. ⭐⭐⭐⭐⭐ "A 100+ seat healthcare contact center handling 1M+ interactions a year was evaluating a move off Zoom CC: high per-seat costs, DTMF menus, no AI self-service. I built the Amazon Connect proof of concept that made the case: a conversational Lex IVR where patients speak naturally to schedule appointments or check claims, member-ID authentication against DynamoDB, context-carrying agent handoff, Amazon Q agent assist, CloudFormation one-click deploy." Amazon Connect + Lex migration PoC ⭐⭐⭐⭐⭐ "A B2B services business wanted outbound that runs itself. The pipeline enriches leads through Apollo, scores them with AI, drafts personalised emails, sequences through Instantly, detects replies, and syncs the CRM. Open, reply, and bounce rates are tracked so deliverability issues surface before they hurt the sending domain." Cold outbound infrastructure, B2B services client CORE SKILLS: AI Automation, AI Agents, AI Implementation, AI Agent Development, AI Chatbot, AI Bot, AI Classifier, Artificial Intelligence, Claude, ChatGPT, Gemini, OpenAI API, ChatGPT API, Anthropic, AWS Bedrock, AWS Lambda, API Gateway, EventBridge, S3, Marketing Automation, Business Process Automation, Workflow Automation, CRM Automation, Email Automation, Task Automation, Omnichannel Automation, Lead Management Automation, n8n, Zapier, Make, Python, JavaScript, Node.js, Java, Google Apps Script, JSON, API Integration, Application Integration, WhatsApp Business API, Missed Call Recovery, No-Show Reduction, Lead Response Automation, Document Collection Workflows, Interview Scheduling, Cold Outreach Infrastructure, Lead Generation, Lead Qualification, Apollo, Apify, Instantly, HubSpot, Salesforce, Pipedrive, HighLevel, Notion, Google Sheets, Data Scraping, Dashboard, DevOps, Scripting, Facebook Graph API, Architecture