Experienced Software and Data Engineer with over 13 years of experience building data-driven applications, RESTful APIs, and microservices. I am familiar with the complete software development life cycle, build automation, infrastructure as code, and CI/CD development. Also experienced with AWS and Azure, with a focus on Data Engineering and creating keyword targeting for Upwork profile overviews. Expertise: - ETL: AWS Glue, Azure Data Factory, Step Functions, Airflow - Automation (IaaC): Terraform, AWS CDK, Azure Biceps - Languages: Python, Java, Javascript, Go, SQL - Cloud Platforms: AWS, Azure - Frameworks: Apache Spark, DBT (Data Build Tool), Pyspark, Airflow, Pandas, Scikit-learn - Tools: Postgres, DynamoDB, MongoDB, Redis, SQL Server, Elasticsearch, Spark, Flink, GitHub actions, Docker

I am very good at peoplesoft and Salesforce. Knows in depth about peopletools, app Engine, peoplecode, integration broker, Oracle Integration Cloud, CI, SQL, PL/SQL, REST and SOAP Web Services. Also knows about Javascript HTML and CSS Salesforce admin, Classic and lightening UI, form and approval builder, custom objects

I design and deploy production-grade large scale applications. With proven experience at global companies like 𝗧𝘂𝗿𝗸𝗶𝘀𝗵 𝗔𝗶𝗿𝗹𝗶𝗻𝗲𝘀 and 𝗨𝗻𝗶𝘃𝗲𝗿𝘀𝗶𝘁𝘆 𝗖𝗼𝗹𝗹𝗲𝗴𝗲 𝗟𝗼𝗻𝗱𝗼𝗻, I build robust, scalable, and well-tested web and mobile solutions tailored to your business goals. 🏆 𝗡𝗼𝘁𝗮𝗯𝗹𝗲 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 (𝗦𝗲𝗲 𝗹𝗶𝘃𝗲 𝗱𝗲𝗺𝗼𝗻𝘀𝘁𝗿𝗮𝘁𝗶𝗼𝗻 𝗶𝗻 𝗽𝗼𝗿𝘁𝗳𝗼𝗹𝗶𝗼) 1 - Drive Weather App (100K+ users) - 2026 Built custom routing APIs using OpenStreetMap and GraphHopper routing engine with vehicle-specific profiles and high-accuracy ETA predictions across North America. 2 - ScooterNav (Netherlands) - 2025 Designed Nedherland's first custom scooter routing solution with ferry handling and regional road optimization. 3 - Turkish Airlines Developer Portal (2024) Delivered enterprise-grade REST APIs suite integrated into one of the world's largest airline platforms. 4 - European Research Council Project (€2.5M Funded, 2021) Contributed as Java Developer & Researcher in an international academic consortium. 5 - “Android Mobile Programming in Java” (2017) Used as a recommended textbook in several Turkish universities. 𝗠𝘆 𝗰𝗼𝗺𝗽𝗹𝗲𝘁𝗲 𝗯𝗮𝗰𝗸𝗲𝗻𝗱 𝗮𝗻𝗱 𝗳𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 𝘀𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀: - end-to-end system development from concept to production. - AI integration - backend automation platforms - designing scalable APIs - deploying cloud and VPS servers 𝗜 𝗮𝗹𝘀𝗼 𝗵𝗲𝗹𝗽 𝗰𝗼𝗺𝗽𝗮𝗻𝗶𝗲𝘀 𝘁𝗼: - build routing and navigation solutions using GraphHopper and OpenStreetMap. - optimize paths for various vehicle types (cars, trucks, motorbikes, bikes, scooters and so on) and pedestrians - develop high-accuracy ETA systems - deploy scalable geospatial infrastructure - configure geocoding systems (text address to geographical coordinates and vice versa) using Nominatim, Photon, Pelias If you have a question, you can book me for a consultation. We can review the key points efficiently and define the best next steps. 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗦𝘁𝗮𝗰𝗸𝘀: - Frontend Integration & UI Development (Angular, JSF, PrimeFaces, HTML/CSS) - Backend Development (Java & Spring Boot) - Secure Authentication (JWT, Spring Security) - Database (OracleSQL, MSSQL, PostgreSQL, MyBatis, Redis Caching, CouchBase) - Unit & Integration Testing (JUnit, Mockito) - CI/CD Pipelines & Docker - Documentation & Technical Writing (Markdown, Swagger/OpenAPI, ApiCurio) - Domain Expertise: GraphHopper. OpenStreetMap, Nominatim, Pelias 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗲𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 I always aim to improve my skills at all time and get certified by respected organizations.

With over 6 years of hands-on experience in building and optimizing data pipelines, I specialize in delivering end-to-end data engineering solutions that scale. Whether it's setting up robust ETL workflows, migrating to the cloud, or implementing real-time data streaming, I bring a performance-driven approach to every project. 🔧 Core Skills & Technologies: Cloud Platforms: AWS (Glue, S3, Redshift, EMR), GCP (BigQuery, Dataflow), Azure Data Engineering Tools: Apache Spark, Airflow, Kafka, DBT, Hadoop Languages: Python, SQL, PySpark, Bash Databases: PostgreSQL, MySQL, Snowflake, MongoDB DevOps & CI/CD: Docker, Terraform, Git, Jenkins

I am an experienced Senior .NET Developer with 13+ years of professional experience and 115+ successful projects helping startups, SaaS companies, enterprises, and growing businesses build and improve software using C#, .NET, ASP.NET Core, ASP.NET MVC, SQL Server, Azure, and REST APIs. Whether your application needs new features, performance improvements, bug fixing, database optimization, cloud migration, or complete modernization, I can become a productive part of your team quickly and deliver reliable results. 👉 My Core Services: ✅ Backend Development - .NET, .NET Core, .NET Framework, C#, ASP.NET Core, VB.NET - ASP.NET MVC, Web API, ADO.NET, Razor, Blazor, Web Forms - Entity Framework, Entity Framework Core, Windows Services ✅ Frontend Development - AngularJS, React, JavaScript, TypeScript, jQuery - HTML, CSS, Bootstrap, Tailwind CSS, Material UI ✅ API & Cloud Services - RESTful & SOAP API Development, OAuth, JWT Authentication - Azure, AWS SDK, OpenAPIs, Stripe, PayPal, Redis, ElasticSearch ✅ Databases & Storage - MSSQL, MySQL, PostgreSQL, MongoDB, SQLite, GraphQL ✅ DevOps & Deployment - Microsoft Azure (App Services, CI/CD), AWS, Docker, Web Hosting ✅ Other Technologies Skills - Python, Django, Flask, FastAPI, Jupyter Notebook, Selenium, Data Visualisation, ETL - API Development, Authentication, Authorisation - SQLAlchemy, PostgreSQL, MySQL, SQLite, SQL Server, Datasets - Web hosting, Docker, Azure, AWS, GCP, DigitalOcean, GoDaddy, Web Hosting - Python Libraries: NumPy, pandas, scikit-learn, TensorFlow, etc. - AWS SageMaker, AWS Bedrock, AWS Machine Learning Services, AWS AI Services - Azure Cognitive Services, Azure Bot Service, Azure QnA Maker, Azure Vision, Azure Document Intelligence 👉 My Availability: - 40 hours/week - Flexible to work in EST, PST, GMT, AEST time zones. ✅ Why Clients Hire Me: - Deep expertise in the Microsoft stack - Scalable & maintainable architecture - Clear communication & requirement understanding - Commitment to deadlines and quality 🔷 Let's transform your ideas into reality with powerful .NET solutions

Expert Developer | PHP Laravel | Python FastAPI Django | Java Spring Boot | AI Agent Development | LLM Integration | RAG Pipeline | AI Data Engineer | Vector Database | Redis | MySQL | PostgreSQL | PgVector | React | FinTech | Payment Systems | MFS - Mobile Financial Service | Go | Rust | C/C++ | NodeJs | Kafka | RabbitMQ | High-Performance Microservices | Event Driven Design | Domain Driven Design | AI Chatbot | 7+ years of professional experience | I build backend products that ship and stay fast under load — Laravel apps delivered end-to-end, FastAPI services with AI/RAG wired in properly, and payment systems moving real money. If you need a Laravel product built or rescued, an LLM feature integrated without turning your codebase into a prototype, or a slow API diagnosed and fixed, that's my lane. 7+ years of professional experience, including bKash (Bangladesh's largest mobile financial service, millions of daily transactions) and 2.5 years working remotely with SELISE, a Zürich-based software company, on Swiss and European enterprise projects. => SELECTED WORK ## PHP Laravel product delivery (Aerotia International + open source) Delivered a CMS-driven corporate website end-to-end for an aviation & marine solutions distributor: Laravel 12 (PHP 8.2) JSON API with a Blade admin CMS and a React 18 + TypeScript frontend, live in production — plus a Laravel 9 ledger/accounting portal for the same client. I also author and maintain laravel-gitstamp, an MIT-licensed open-source Laravel package CI-tested across Laravel 10–12. Earlier professional Laravel work includes a healthcare-planning app and a government HR reporting system. — details and code in my Portfolio. ## AI RAG pipeline over S3 document stores (Python/FastAPI) Built a retrieval-augmented generation pipeline that ingests and indexes documents directly from S3 buckets — OpenSearch (kNN, HNSW, cosine similarity) for semantic search, sentence-transformer embeddings, and Redis caching that cut repeat-query latency from 45-150 seconds down to under 200ms. FastAPI backend, fully containerized. Teams query their document archives in natural language instead of digging through them manually. — details and code in my Portfolio. ## AI Assistant with hardened edge security Built and hardened a production AI chat assistant for this portfolio: found and fixed a leaked API key exposed in a client-side bundle by moving secrets into a Cloudflare Worker as an encrypted proxy. Added origin allowlisting, per-IP rate limiting (20 req/60s), 30s timeouts, and field-level request validation. Diagnosed and fixed compounding latency bugs via observability — cut model response time from 6.1s to 2.3s. Grounded on parsed CV/context docs with confirmed-action triggers for safe user interactions. — details and code in my Portfolio. ## Fintech core payment platform (bKash) Contributed to microservices architecture for a payment platform handling millions of daily transactions. Optimized database queries and Redis caching strategies, improving response times by 40%. Led a zero-downtime Spring Boot 2→3 production migration of a live PIN-reset service — Jakarta EE namespaces, AWS SDK v1→v2 (DynamoDB Enhanced Client), reactive Kafka — with no service interruption on a system where downtime means real customer impact. ## Enterprise IoT platform (Swiss client, via SELISE) Built a multi-tenant IoT middleware for an electric vehicle/aerospace manufacturer, processing millions of data points in real time. Extended the open-source ThingsBoard platform with custom rule nodes, an MBUS decoder, and Swisscom network integration (Java, PostgreSQL, Cassandra, TimescaleDB, WebSocket). I'm also a merged contributor to ThingsBoard itself. ## Online Judge platform (Rust/Axum) Competitive-programming judge built as microservices, deployed via Kubernetes Helm with KEDA autoscaling on Kafka consumer lag — workers scale with actual load instead of running fixed capacity 24/7. => HOW I WORK Async-first and timezone-flexible, with clear documentation and milestone-based delivery so you can course-correct early. I hold my own code to the same standard I enforced as a mentor and reviewer at bKash: 85%+ test coverage, clean commits, CI/CD from day one. Message me with what you're building — I'll give you a straight read on scope and approach before you commit to anything. Key differences from the version stored in Upwork_analysis.md earlier: the keyword line now opens with the exact title phrases (helps Upwork search match title ↔ overview), the hook sells "Laravel built or rescued + AI integrated cleanly" instead of fintech-first, and bKash moved to #4 — still prominent for credibility, but no longer contradicting a Laravel-led title. All Laravel claims remain verified against the portfolio repo.

I turn complex data into dashboards, analytics, and automated BI solutions that drive measurable business results — including $500K+ in savings and 30% better forecasting. DM me for a quick response! 🔹 I specialize in Business Intelligence, Data Analytics, Marketing Analytics, Attribution, Product Analytics, and Data Engineering using Power BI, SQL, Python, ETL/ELT, dbt, APIs, Snowflake, and BigQuery. 🔹 My Expertise: ➝ Power BI, Metabase, Excel, Google Sheets & Interactive Dashboards ➝ Marketing Analytics, Campaign Analytics & Attribution ➝ Product Analytics, Funnel Analysis & Customer Journey Analytics ➝ KPI Dashboards, Executive Reporting & Data Storytelling ➝ SQL, Python, Business Intelligence & Data Analytics ➝ ETL/ELT, dbt, Data Warehousing & Data Engineering ➝ Snowflake, BigQuery, PostgreSQL & MySQL ➝ REST APIs, Google Sheets Automation & Apps Script ➝ Data Scraping, Workflow Automation & AI Workflows ➝ AI Knowledge Bases, RAG & Documentation Systems 🔹 What Can I Help You With? ➝ Build interactive BI dashboards with clear KPIs and data storytelling. ➝ Analyze marketing channels, campaigns, attribution, funnels and customer behavior. ➝ Build product analytics dashboards for engagement, conversion, retention and feature usage. ➝ Develop ETL/ELT pipelines using SQL, Python, dbt, Snowflake & BigQuery. ➝ Automate reporting using APIs, Google Sheets, Apps Script and workflow automation. ➝ Optimize SQL, data pipelines and reporting performance. ➝ Build AI-ready knowledge bases, RAG systems and documentation. ➝ Deliver end-to-end BI & data engineering solutions from requirements to deployment. 🔹 Proven Impact: ➝ Reduced ETL processing time by 60% while processing 1M+ daily records. ➝ Delivered BI & reporting solutions that drove $500K+ in business savings. ➝ Improved forecasting accuracy by 30% through automated reporting and analytics. ➝ Built scalable dashboards, data pipelines and automation for faster decision-making. Let's transform your data into actionable analytics, automated reporting, and Business Intelligence that drives real business results.

.NET Software Developer | Clean Architecture & Domain-Driven Design Specialist I transform complex business challenges into elegant, maintainable software solutions. As a seasoned .NET developer, I specialize in building robust, scalable applications that truly reflect your business domain. My clients appreciate my ability to deliver clean, well-structured code that not only solves today's problems but evolves naturally with their business. What sets me apart: - Domain-Driven Design expertise for tackling complex business problems by creating software that speaks your business language - Deep .NET ecosystem knowledge with a focus on Blazor for creating responsive, interactive web applications - Architecture-first approach ensuring your project has a solid foundation through bounded contexts and strategic design - Clean code craftsman dedicated to writing clear, self-documenting code that future developers will thank you for - Practical design pattern implementation (MVC, MVVM, Dependency Injection) tailored to your specific business needs My development philosophy: I believe great software emerges from understanding the domain deeply. By applying DDD principles, I create models that directly reflect your business reality, ensuring that technical implementations align perfectly with actual business needs. I embrace SOLID principles, ubiquitous language, and bounded contexts to deliver solutions that not only work flawlessly but speak your business language. What clients can expect: - Collaborative domain modeling to ensure we're solving the right problems - Software that embodies your business rules and processes naturally - A strategic approach to complex domains through context mapping - Transparent communication and responsive collaboration - Consistent delivery of high-quality, thoroughly tested code I'm ready to help you transform your complex business challenges into well-designed, domain-focused solutions. Let's discuss how my DDD approach can address your specific needs and create lasting value for your business.

❓Are your GIS workflows slowing down your business? Contact me! 👉 I build automated GIS systems —helping organizations reduce costs, improve decision-making, and launch location-based products faster. Invite me for an interview & I will make a demo solution for you for free. Over the past 9+ years, I've built geospatial solutions for organizations including IBM, public health initiatives, a leading investment bank, and a high-growth AI startup. On Upwork, I've helped clients automate GIS workflows, build interactive mapping applications, and develop reliable spatial data pipelines that continue delivering value long after the project is complete. I don't just build maps—I build software systems powered by location intelligence. ⭐ What I Can Help You Build 🗺️ GIS Automation & Spatial ETL - Automated GIS workflows - Python automation scripts - Spatial ETL pipelines - GeoPandas & Shapely processing - Data validation and transformation - Batch processing for large geospatial datasets 🌍 Interactive Maps & GIS Applications - Mapbox & Leaflet web applications - Interactive dashboards - KML, GeoJSON, Shapefile processing - OpenStreetMap solutions - Territory mapping - Custom GIS tools 📊 Spatial Analytics & Decision Support - Location intelligence - Site selection analysis - Spatial reporting - Time-series analysis - Predictive geospatial analytics - Data visualization 🤖 AI + GIS Solutions - AI-powered GIS workflows - Intelligent document processing - OCR and spatial extraction - Geospatial data automation - Machine learning applications - LLM-powered geospatial tools ☁️ Backend & Cloud - PostGIS & PostgreSQL - FastAPI - REST APIs - AWS & Google Cloud - Docker - Database integration 🚀 Selected Project Experience Franchise Territory Automation - Built an automated Python and GeoPandas workflow that generated KML territory maps, validated geometries, and streamlined territory management. Interactive GIS Applications - Developed web-based mapping tools and dashboards that enabled non-technical users to explore and analyze spatial data. Geospatial Data Pipelines - Designed scalable ETL pipelines for collecting, cleaning, transforming, and integrating large geospatial datasets from multiple sources. AI & Document Automation - Built automation workflows combining OCR, AI, and geospatial processing to extract structured information from complex documents. 🌐 Industries I Serve 🏡 Real Estate & PropTech 🏥 Healthcare & Public Health 🏦 Financial Services 🚚 Logistics & Transportation 🌳 Environmental & Sustainability 🏢 Enterprise Software 🚀 Technology Startups 🏆 Reviews from clients ⭐⭐⭐⭐⭐ "Caesar has been fantastic. Top notch quality work, always on time, and always looks at the bigger picture. He consistently brings valuable suggestions and demonstrates deep expertise in GeoPandas, OpenStreetMap, geospatial transformations, Python, Git, GitHub, and many other technologies." ⭐⭐⭐⭐⭐ “Caesar has extensive experience in data visualization, particularly in creating customized maps based on geographic coordinates. He communicates effectively and has a clear understanding of requirements. His code is of high quality, and he is willing to refine it repeatedly to ensure excellence. Overall, Caesar is an excellent developer and a great team player.” 📅 Availability 🕒 Available: 09:00 – 18:00 PST (GMT−8) 📩 Response time: usually within a few hours during business days. 🤝 Let’s connect Whether you're building a GIS product, modernizing legacy GIS workflows, or exploring how AI can improve your geospatial processes, I'd be happy to discuss your project. When you reach out, tell me: - Your current workflow - Your biggest technical challenge - What success looks like I'll recommend the most practical solution—even if that means a simpler approach than you originally envisioned.

With me, you’re not just hiring a developer, you’re getting a CTO-level engineer who builds software that actually scales and makes money (with proof!). My focus is simple: deliver high-performance, production-ready software that creates real business value, without wasted time or wasted money! If you want transparency, straight answers, and a stress-free development experience, you’ll enjoy working with me. Here’s how I do that: 1- Using AI only where it genuinely reduces cost and speeds delivery (not as a gimmick). 2- Reusing battle-tested code from 12+ years of real-world development, so you’re not paying to reinvent the wheel. 3- I build it right the first time, so they don’t break as users grow ++++++++++++++++++++++++++++++++++++ MY PROCESS (What you can expect from me) ++++++++++++++++++++++++++++++++++++ I follow a clear, efficient process designed to keep projects calm and predictable: a- Deep discovery: Understanding your users, business goals, and constraints b- Thoughtful design: Clean UX/UI that solves real user problems c- Strong engineering: Secure, performant, maintainable code d- Thorough testing & delivery: So launches don’t feel risky Clients value me because I communicate clearly, explain tradeoffs, and don’t disappear once development starts or after development ends. LET'S DISCUSS YOUR PROJECT! If you want help bringing your product to market, improving an existing app, or building something that can actually scale and make money, then by all means... let’s talk. I’m happy to walk through your idea step-by-step with you, identify risks early, and help you make smart technical decisions before you invest more time or money. ++++++++++++++++++++++++++++++++++++ What I Specialize In ++++++++++++++++++++++++++++++++++++ Medical & healthcare applications Fintech & payment systems AI-powered tools and automation Social networks & marketplaces Streaming & content platforms Productivity & workflow tools E-commerce & B2B platforms I work with both consumer-facing products and enterprise / B2B systems. ++++++++++++++++++++++++++++++++++++ Technical Experience ++++++++++++++++++++++++++++++++++++ MOBILE iOS (Swift, Objective-C, WatchOS) Android (Kotlin, Java) React Native, Flutter Web & Backend React, Next.js, Angular Node.js (Express) PHP (Laravel, Symfony, CodeIgniter, Cake) Python DATABASES SQL: MySQL, Postgres, MSSQL, SQLite NoSQL: DynamoDB, MongoDB, Firebase INTEGRATIONS & TOOLS Payments: Stripe, PayPal, Square, Clover, QuickBooks, Aloha Analytics & Monitoring: Sentry, Crashlytics, Mixpanel, GA Mobile & Growth: TestFlight, Branch, AdMob Maps: Google Maps, Mapbox Social APIs: Facebook, TikTok, X (Twitter), LinkedIn, Instagram