Healthcare organizations, construction firms, and software teams hire me when their systems don't talk to each other. I build the integrations, automation, and AI workflows that fix that. FHIR, Procore, QuickBooks, MCP, RAG pipelines. Top Rated Plus | 100% Job Success | 14+ Years | 80+ Projects | $600K+ Delivered. I eliminate manual work between your critical systems — healthcare platforms, construction tools, e-commerce channels — and deliver ROI in 2–3 months. 🏆 𝗣𝗥𝗢𝗩𝗘𝗡 𝗪𝗜𝗡𝗦 → Construction tech:Automated Procore ↔ QuickBooks, ComputerEase bidirectional sync eliminating 23 hrs/week of manual data entry. ROI in 7 weeks. Client: "This paid for itself faster than any software we've purchased." → AI automation: Built MCP connector (Node.js + Puppeteer + GCP) reducing a 2–3 hour daily manual workflow to under 10 minutes for a collectibles marketplace client. → Rare disease research platform: Epic FHIR R4 / SMART on FHIR integration, PHI redaction, AWS S3 medical records — live at a major US research hospital serving physicians and researchers. → Clinical AI platform: AI-powered treatment recommendation engine with expert voting system used by oncologists and emergency medicine physicians across multiple hospital networks. → Healthcare staffing SaaS: Automated nurse recruitment platform — 75% less manual work, 45% better placements, zero expired licenses, 30+ hrs saved weekly across 500+ healthcare professionals. 💡 𝗪𝗛𝗔𝗧 𝗜 𝗕𝗨𝗜𝗟𝗗 🔌 𝗘𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 QuickBooks Desktop SDK • QuickBooks Online API • Procore API • ComputerEase • Sage 300 CRE • Epic FHIR R4 • Cerner • athenahealth • Dentrix • Dentrix Ascend • Eaglesoft • Open Dental • Curve Dental • Stripe • Salesforce • NetSuite. 🤖 𝗔𝗜 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 & 𝗔𝗴𝗲𝗻𝘁𝗶𝗰 𝗔𝗜 MCP (Model Context Protocol) servers • OpenAI GPT-4 • Claude API • LangChain • Agentic workflows • Document processing automation (70% faster) • n8n pipelines. 🕷️ 𝗪𝗲𝗯 𝗦𝗰𝗿𝗮𝗽𝗶𝗻𝗴 & 𝗕𝗿𝗼𝘄𝘀𝗲𝗿 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 Puppeteer • Playwright • Headless Chrome • Price monitoring • Multi-platform inventory sync • SOCKS5 proxy support. 🏥 𝗛𝗲𝗮𝗹𝘁𝗵𝗰𝗮𝗿𝗲 (𝗛𝗜𝗣𝗔𝗔-𝗰𝗼𝗺𝗽𝗹𝗶𝗮𝗻𝘁) EHR/EMR integrations • Epic FHIR R4 • SMART on FHIR / OAuth2 • PHI redaction • Dental practice management systems • Staffing automation: credentials, licenses, expiration alerts, certified payroll • Telemedicine • Clinical AI. 🏗️ 𝗖𝗼𝗻𝘀𝘁𝗿𝘂𝗰𝘁𝗶𝗼𝗻 𝗧𝗲𝗰𝗵 Procore API • QuickBooks Desktop/Online • ComputerEase • Sage 300 CRE bidirectional sync • Budget & change order management • GPS mobile time tracking • Subcontractor compliance (insurance, licenses, lien waivers) • Certified payroll • Offline-first field apps. 🛒 𝗘-𝗖𝗼𝗺𝗺𝗲𝗿𝗰𝗲 & 𝗠𝗮𝗿𝗸𝗲𝘁𝗽𝗹𝗮𝗰𝗲𝘀 BigCommerce • Shopify • NetSuite • Multi-channel inventory sync • Automated listing management • Price monitoring • Competitor analysis • MCP-powered marketplace automation. 💻 𝗖𝘂𝘀𝘁𝗼𝗺 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 & 𝗦𝗮𝗮𝗦 Vue.js • React • Next.js • .NET Core • iOS Swift • React Native (offline-first) • Multi-tenant SaaS up to 10K+ concurrent users • 99.9% uptime • $209K+ single-contract enterprise platform delivered. 🛠️ 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 Backend: .NET Core • C# • Node.js • NestJS • Python • Django • Entity Framework Frontend: Vue.js • React • Next.js • Angular • TypeScript • Tailwind CSS Mobile: iOS Swift • React Native • Expo Database: SQL Server • PostgreSQL • MySQL • MongoDB • Redis Cloud: AWS (EC2, RDS, S3, Lambda, App Runner) • Azure • GCP • Docker • CI/CD 📈 𝗥𝗘𝗦𝗨𝗟𝗧𝗦 • 23 hrs/week saved — Procore ↔ QuickBooks automation • 75% less manual work — healthcare staffing platform • 2–3 hr daily workflow → under 10 min — MCP automation • 90% fewer billing errors — EMR/practice management • $50K+ saved quarterly — enterprise workflow automation • 500+ healthcare professionals on a single HIPAA-compliant platform ⭐ 𝗪𝗛𝗬 𝗖𝗟𝗜𝗘𝗡𝗧𝗦 𝗖𝗛𝗢𝗢𝗦𝗘 𝗠𝗘 ✓ 100% Job Success Score • Perfect 5.0 • Top Rated Plus ✓ 14+ years — I've likely solved your exact problem before ✓ ROI in 2–3 months, not years ✓ Full code ownership + documentation ✓ EST overlap | 2–3 hr response | Daily updates 💬 𝗥𝗘𝗔𝗗𝗬 𝗧𝗢 𝗦𝗧𝗔𝗥𝗧? Message me with your systems, pain points, and timeline. I'll respond within 2–3 hours with a tailored approach and examples from similar projects. 🚀 Let's eliminate your manual work.

I design Microsoft 365 business systems where Power Apps, Power Automate, SharePoint, Dataverse, Power BI, APIs, and AI work as one controlled operating model - not as separate tools. One system I built now supports a U.S. business processing 1,000+ orders per day and reduced manual effort and cycle time by 2–10x across key workflows. My work starts from the record lifecycle, permission model, source-of-truth logic, and reporting layer. This is where most Power Platform projects break: forms, approvals, storage, and dashboards are built separately, so the system looks finished but the data, access, and KPIs stop reconciling. I’m a Top 1%, Expert-Vetted Power Platform architect. I build across three layers that are usually treated separately: business apps, workflow automation, and reporting. When the data layer and process logic are controlled first, the system becomes easier to run, audit, support, and extend. Where I fit best: Fragile automations that keep failing. Messy data models and reports nobody trusts. Multi-system integrations where reliability matters more than the cheapest build. Power Platform projects that need an architect, not just a builder. What clients say: "Slava has played a pivotal role in introducing and developing business intelligence tools at Autoplicity. Today all our employees, including executives, rely on the Power BI dashboards he built for daily operations." — Sean McWherter, CEO, Autoplicity, USA (5-year partnership) "Slava has saved our company thousands. He automated our business processes across Office 365, Power Automate, API, Zendesk, and CRM." — Shahzad Chagani, Director of Operations, PE Energy, USA How I work: I build and test in my own environment, so you don't share tenant access until it's appropriate. Direct communication, fast turnarounds across time zones. After go-live I can stay on for stabilization and continuous improvement. Currently working with businesses in the US, Canada, UK, Australia, and the Middle East. Background: PMP-certified, Microsoft Certified, dual Master's in Computer Science and Economics. For enterprise project management I run full PMO builds on MS Project Online, Planner, SharePoint, and Power BI. Core stack: Power Apps (Canvas + Model-Driven), Power Automate, Power BI, Microsoft Fabric, SharePoint, Dataverse, SQL, Azure. Integration via Graph API, REST API, Data Factory. AI where it earns its place — document extraction, lead sorting, message and image analysis — using OpenAI, Claude, and Azure Cognitive Services. If you want a senior partner who reduces chaos and makes the system hold, I'm a strong match.

Ranked in the top 3% on Upwork globally, I’ve built trusted relationships with 80+ clients and received 60+ ⭐⭐⭐⭐⭐ reviews -- all within my first year of active use. With 14+ years of experience in Data Analytics, I operate at the intersection of strategy, analytics, and automation -- uncovering the signal behind the noise and translating it into insights leaders can act on. My work doesn’t just explain what happened; it clarifies why it matters and what to do next. As a Top Rated Plus freelancer, clients rely on me as a true thought partner, not just a technician. From Excel automation and SQL optimization to executive-level dashboards, financial models, and automated reporting systems, I design solutions that are precise, scalable, and decision-ready. Clients hire me when they need data analytics that answer questions like: • Where is our profit actually coming from? • What will revenue look like over the next 3–5 years? • Which marketing channels or business units are driving ROI? • How do we automate reporting so leadership sees the numbers instantly? My models and dashboards are designed for CFOs, founders, and executives who need confidence in their numbers. Core Expertise: ✔️Data Analytics & Engineering: Advanced SQL, Excel, SAS, and Access solutions that transform raw, fragmented data into reliable, analysis-ready assets. ✔️Statistical & Predictive Modeling: Regression, forecasting, and scenario modeling designed to support real business decisions—not academic exercises. ✔️Executive Visualization & BI: Tableau and Power BI dashboards that tell a clear story, highlight trade-offs, and drive alignment at the leadership level. ✔️AI-Driven Analytics & Automation: I embed AI directly into SQL workflows, Excel models, and financial analytics to accelerate insight delivery without sacrificing business context. My approach blends deep analytical reasoning (≈70%) with AI-powered automation (≈30%), ensuring speed and accuracy. ✔️Database & Performance Optimization: Purpose-built data structures and optimized queries that turn databases into high-performance decision engines. 💬 Client Feedback (⭐⭐⭐⭐⭐): (Recent Review from E.H.) "Subomi is the literal best, total icon!! I am genuinely grateful. I love partnering with a smart, hard, competent worker and he is just that! He is a great thought partner, beyond just someone to create models for you. I hired him for multiple projects and hired him additionally after I needed to redo work from someone who wasn't as thorough. He is extremely accurate, thorough, patient, helpful, willing to iterate, and does more than just create the models/chart/KPIs that you need - he helps you tell the story (both written and walking you through it) so you can understand all his assumptions. He makes projects better than what you would do on your own. Also, the work was so good that my bigwig private equity friend who reviewed his work was super impressed." 🌟 Let’s Build Something That Moves the Needle: If you need clarity from complexity, confidence in your numbers, or analytics that actually influence decisions, let’s talk. I don’t just deliver outputs; I deliver understanding, alignment, and results.

I am a UK-based Senior Accountant and part-owner of a CIMA-regulated practice based in Bristol, providing compliant, commercially focused accounting and tax services to a portfolio of ~120 clients. Our practice delivers a full-service offering, including bookkeeping, VAT, payroll, statutory accounts, and tax optimisation (including capital allowances and allowable expense planning). We are Xero Advisor Certified and have over a decade of hands-on experience supporting owner-managed businesses across a range of sectors. What differentiates my work is the combination of regulated accountancy with advanced financial modelling and automation expertise. Since 2005, I have specialised in building automated financial models, reporting systems, and process-driven solutions using Excel/VBA, SQL, Python, and Google Apps Script. This allows us to go beyond standard compliance work—helping clients improve reporting speed, reduce manual errors, and make better financial decisions. I also lead on higher-value engagements including: - R&D Tax Credit claims - SEIS/EIS fundraising support - Bespoke financial forecasting and modelling In 2009, I developed an ICAEW-accredited financial forecasting platform designed to rapidly build integrated financial models. This reflects my broader approach: combining technical capability with accounting expertise to deliver solutions that are both compliant and commercially effective. Alongside practice work, I continue to support clients with bespoke modelling and automation projects across sectors, including construction & property, healthcare, FMCG, and financial services. I maintain a consistently high client satisfaction record by focusing on practical delivery, responsiveness, and long-term usability, ensuring clients receive support that extends beyond year-end compliance. I aim to ensure every client receives 5-star treatment, from project conception through to post-delivery support.

✅ 4x Microsoft Certified (PL-300, AI-900, DP-900, MS-900) | 100% Job Success | Top Rated From Wall Street analytics to AI-powered dashboards. I build BI systems that C-suite executives trust to make decisions. With an Economics degree, a Systems Engineering degree, and experience at Morgan Stanley and Moody's Analytics, I bring a rare combination: I understand both the financial logic behind the numbers and the engineering required to deliver them reliably at scale. I also led M&A analytics at Kareo (healthcare SaaS) and founded Ceteryx, a data intelligence consultancy. 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗲𝗹𝗶𝘃𝗲𝗿 𝗣𝗼𝘄𝗲𝗿 𝗕𝗜 𝗗𝗮𝘀𝗵𝗯𝗼𝗮𝗿𝗱𝘀 & 𝗥𝗲𝗽𝗼𝗿𝘁𝗶𝗻𝗴: Executive KPI scorecards, financial reporting suites, operational dashboards, designed for CFOs, COOs, and board presentations. 𝗣𝗼𝘄𝗲𝗿 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: Power Apps for data capture + Power Automate for workflow automation + Power BI for live reporting, a fully integrated Microsoft stack. 𝗔𝗜-𝗘𝗻𝗵𝗮𝗻𝗰𝗲𝗱 𝗕𝗜 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀: I integrate OpenAI/Claude into Power Platform workflows, automated executive summaries, anomaly detection, and natural-language data queries. 𝗖𝗥𝗠/𝗘𝗥𝗣 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀: Salesforce, HubSpot, Dynamics 365, NetSuite, QuickBooks. I connect your operational systems to Power BI for a single source of truth. 𝗗𝗮𝘁𝗮 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴: ETL pipelines (Python, Airflow, dbt), data modeling, Snowflake/PostgreSQL/Azure optimization. 𝗣𝗿𝗼𝘃𝗲𝗻 𝗜𝗺𝗽𝗮𝗰𝘁 Reduced ETL runtime 70% for a NASDAQ SaaS firm → $30K/mo in compute savings Built real-time fraud detection pipeline (99.3% accuracy) with Python & Kafka Migrated 50+ on-prem SQL databases to AWS with zero downtime Delivered CFO-grade SaaS metrics dashboards (MRR, LTV, churn) for board presentations 𝗪𝗵𝘆 𝗠𝗲 Ex-Morgan Stanley & Moody's Analytics: I speak finance fluently 4x Microsoft Certified: PL-300, AI-900, DP-900, MS-900 Founder of Ceteryx: entrepreneurial mindset, ownership mentality Fluent in English, Spanish, Italian Fast starts: most clients see first results in < 7 days Free 30-minute consultation to scope your project ⭐ Client Reviews "Built a dynamic, CFO-grade dashboard from minimal specs. Hit every deadline." "Joined disjointed data I thought impossible and delivered CXO-ready insights." "Responsive, insightful, knows the ins and outs of MS Power Platforms and OpenAI integration." 📞 Send me your data challenge: I'll blueprint a solution in 24 hours, no strings attached.

⭐⭐⭐⭐⭐ “Our services ran 10x faster after Shafir’s optimization. He’s a genius!” — Paul S., Schoop Ltd 📣 With over 11 years of professional experience, I am a skilled SQL Server freelancer on Upwork, specializing in SQL Server DBA, database development, and business intelligence development (Data Engineer). 🎯 I've successfully resolved customer-facing SQL Server bottlenecks and achieved significant performance enhancements for Fortune companies and renowned organizations, including the following to illustrate some of them: ☑️ AAA Communication Inc. USA (~14 Million Estimated Revenue per Year) ☑️ NeTex Consulting. USA ☑️ Cloud Retailer. USA (Over 1 Million Invested on Upwork) ☑️ Selectel Wireless. USA ☑️ Jevin Inc. USA ☑️ Boender & BeuteI GmbH, Germany ☑️ Access IT, USA Extensive Experience as a SQL Server DBA (Versions 2000 - 2022) methodically identifying and resolving complex underlying causes of Microsoft SQL Server problems, using a vast variety of techniques and tools. I have solved numerous show-stopping SQL Server Performance problems, as well as often re-engineered immensely complex designs and code, providing significantly improved performance. Expert Level ability with Data Extraction, Transformation, and Loading (ETL) from numerous heterogeneous data sources. I pride myself in my ability to intuitively gather, interpret and understand your requirements, as well as develop intuitive and creative Business Intelligence Solutions using the full MSBI stack (Power BI, SSAS, SSRS, and SSIS). ⭐ Here's what I can offer to your project ⭐ ✔️ Top-notch experience in utilizing SQL Server across all versions from 2000 to 2022, as well as on various cloud platforms. ✔️ Extensive experience in SQL Server database corruption repair and recovery. ✔️ Extensive experience handling large-scale enterprise transactional databases. ✔️ Expertise in data security best practices, particularly regarding PII and PHI data. ✔️ Proficient in swiftly diagnosing SQL performance issues and pinpointing query bottlenecks. ✔️ Expertise in ETL development using SSIS for data warehouses and Power BI databases. ✔️ 24/7 reliable communication: keeping you constantly informed of project status. ✔️ A dedicated professional committed to your success and adding value to your business. ⭐ Why I stand out from other freelancers. ⭐ ✔️ Client Reviews: My priority is delivering value and building trust with every client. ✔️ Over-Delivering: This principle is central to my freelance work. I aim to exceed expectations and take pride in leaving clients saying "WOW" ✔️ Responsiveness: Highly responsive, ensuring all lines of communication are always open with my clients. ✔️ Resilience: Reach out to any of my current or former clients and inquire about my ability to tackle challenges head-on and find effective solutions for any issue they face. ✔️ Kindness: A core value that permeates every aspect of my life. I treat everyone with respect, approach all situations with empathy, and genuinely strive to enhance my clients' experiences. 🏆 Testimonials and feedback from prominent clients🏆 The client reviews below, also featured in my work history section, highlight the quality of work and value you can expect when working with me. ⭐⭐⭐⭐⭐"I hired Shafir to repair a corrupted SQL database. We used 2 other SQL engineers prior to meeting Shafir and also attempted a repair using a database repair application which also failed. We were at a point where nothing was working and we were coming to the conclusion that this was not repairable as there were too many errors. Shafir was very confident that he could repair the database and after watching him work for just a few minutes I immediately felt some hope of a successful repair. After working on the database for several hours Shafir managed to repair the database and get it working better than it was before. Working 20 years in IT I had never seen anything like it. Shafir is very professional and truly an SQL expert. I would highly recommend Shafir for any SQL project. Thank you." - Dean Cutajar, Director - Access IT ⭐⭐⭐⭐⭐ "Amazing experience! Shafir did the impossible. He was able to take a highly corrupted database and bring it back to life with zero data loss. Once repaired, he optimized the database and has it running better than it was before the corruption. He is responsive and easy to work with. Highly recommended. Will use again in the future." Jeff Cross 303 Networks Inc 🙋🏼♂️I am eager to work with you, to provide reliable, consistent, and High-Level solutions to design/development challenges. Please contact me, so we can discuss how we can work together to FULLY meet your Business Needs!

An 𝗘𝗹𝗲𝗰𝘁𝗿𝗼𝗻𝗶𝗰𝘀 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿 (𝟮𝟬𝟭𝟭), I develop 𝗵𝗶𝗴𝗵-𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗺𝘂𝗹𝘁𝗶-𝘁𝗵𝗿𝗲𝗮𝗱𝗲𝗱 𝗵𝗮𝗿𝗱𝘄𝗮𝗿𝗲-𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗲𝗱 𝘀𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝘀𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀 (𝗖, 𝗖++, 𝗩𝗲𝗿𝗶𝗹𝗼𝗴) for 𝗪𝗶𝗻𝗱𝗼𝘄𝘀 and 𝗟𝗶𝗻𝘂𝘅 across the 𝗗𝗲𝘀𝗸𝘁𝗼𝗽, 𝗙𝗶𝗿𝗺𝘄𝗮𝗿𝗲, 𝗛𝗮𝗿𝗱𝘄𝗮𝗿𝗲 and 𝗪𝗲𝗯 domains. I also design 0.6u to 0.18u CMOS Integrated Circuits. I contributed to 𝗕𝗠𝗪 𝗔𝗗𝗖𝗔𝗠, 𝗠𝗮𝗴𝗻𝗮 𝗠𝗙𝗞𝟱 and vehicle bus encoding/ decoding pipeline projects for 𝗔𝗨𝗗𝗜 and 𝗖𝗔𝗥𝗜𝗔𝗗. I have worked with multiple 𝘀𝗲𝗻𝘀𝗼𝗿 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 (vision), 𝗱𝗮𝘁𝗮 𝗯𝘂𝘀𝗲𝘀 (UART, SPI/DSPI/QSPI, I2C, USB, Ethernet, TFT-LCD, LPDDR-2), 𝗺𝗶𝗰𝗿𝗼𝗰𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿𝘀 (8051-based, RISC-V) and 𝗽𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗲𝗻𝘃𝗶𝗿𝗼𝗻𝗺𝗲𝗻𝘁𝘀 (FreeRTOS, QEMU). I've also programmed 𝗦𝗽𝗮𝗿𝘁𝗮𝗻-𝟲 𝗙𝗣𝗚𝗔𝘀 in 𝗩𝗲𝗿𝗶𝗹𝗼𝗴 and designed 𝗮𝗻𝗮𝗹𝗼𝗴, 𝗺𝗶𝘅𝗲𝗱-𝘀𝗶𝗴𝗻𝗮𝗹, 𝗱𝗶𝗴𝗶𝘁𝗮𝗹 and 𝗻𝗲𝗮𝗿-𝗥𝗙 𝗰𝗶𝗿𝗰𝘂𝗶𝘁𝘀 (800 MHz) in 𝟬.𝟲𝘂-𝟬.𝟮𝟱𝘂 𝗖𝗠𝗢𝗦 technologies. 𝗖𝗮𝗿𝗲𝗲𝗿 𝘀𝘂𝗺𝗺𝗮𝗿𝘆 - 𝟮𝟬𝟬𝟱-𝟮𝟬𝟬𝟴: Web development (classic ASP, PHP, JS, Flash, SQL, HTML5, CSS3) - 𝟮𝟬𝟭𝟭-𝟮𝟬𝟭𝟵: Mixed-signal Semiconductor IC design (0.6u - 0.25u CMOS) - 𝟮𝟬𝟮𝟬-𝗽𝗿𝗲𝘀𝗲𝗻𝘁: Multi-platform Desktop applications: C, C++ (multi-threaded), wxWidgets, Qt, ROS For desktop applications, I use the tech stack: C, C++, Qt5-6, wxWidgets, GTest/ GMock and CMake. On a previous full-time job, extended C++, ROS and ADTF based AUTOSAR (ARXML) software components for ADAS analysis in the automotive industry. (SOME/IP, TAPI DBC, CAN(FD)). Have hands-on experience with LiDAR point cloud data. Currently working on a Semiconductor EDA tool in C++ and wxWidgets as a personal project. My recent professional work includes open source browser customization in C++ (Firefox, Palemoon, CEF) and the development of custom windows credential providers. 𝗗𝗲𝘀𝗸𝘁𝗼𝗽: - C - C++ - C# - Python - wxWidgets - Qt(5, 6) - Win32 - ROS (1, 2) - Identity (and Access) Management (IAM/ IdM) - Single Sign On (SSO) - OAuth - OpenID Connect - JWT/ JWKS - Chromium Embedded Framework (CEF) - Firefox browser customization - Palemoon browser customization - Custom Windows Credential Provider development - Multi-threading - WinUSB-based USB driver - Raw data packets manipulation - Hardware communication -- Serial -- USB -- GSM Modem -- PLC via ABNet API -- Basler GigE LineScan camera using Pylon 5 SDK 𝗪𝗲𝗯: - ASP 3.0/ classic - PHP core/ pure (4, 5, 7, 8) - Javascript core/ pure/ vanilla - (X)HTML 4/5 (W3C Validated, Section 508/ VPAT) - CSS 2/3 - Macromedia Flash (4, 5, 8) Actionscript (1.0, 1.1, 2.0) - MS Access, My SQL, MS SQL Server (custom queries and stored procedures) - cURL - SMS gateways - cHTTP (PHP-based auto login/ navigator to a website) - mPDF, tcPDF 𝗛𝗮𝗿𝗱𝘄𝗮𝗿𝗲: - 0.25u CMOS (Analog design): -- Logic gates -- JK-type Phase Detector -- Charge Pump -- Delay Locked Loop (DLL) - Verilog: -- DDR-2 SDRAM controller -- SPI controller -- I2C controller -- Ethernet MAC -- USB 2.0 Full speed device controller -- Custom ISA 8-bit microprocessor core - QEMU (custom device emulation) 𝗙𝗶𝗿𝗺𝘄𝗮𝗿𝗲: - FreeRTOS 𝗖𝗼𝗺𝗽𝗹𝗲𝘁𝗲𝗱 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 (𝗺𝗮𝗷𝗼𝗿): - Authentik Windows Credential Provider (CEF) - High-frequency (~2400 fps) quad sensor data plotter (Win32 API, C) - Barton Chart scan processor and barcode reader for data extraction (C#, image processing) - Document upload and processing platform (medical) using PHP, javascript and LibreOffice - SMS-based Poll/ Quiz website (PHP, two-way SMS gateway) - Job portal (ASP classic/ 3.0)

Senior .NET developer with 25+ years of hands-on experience working on real production systems. I help companies stabilize, modernize, and extend desktop and legacy .NET applications, taking ownership of existing codebases and delivering clean, maintainable solutions that work reliably long-term. Most of my work involves improving existing Windows desktop applications rather than building throwaway prototypes. I regularly take over mature or poorly documented systems, identify structural and stability issues, and extend functionality without disrupting production workflows. Clients usually come to me when a system is business-critical and needs careful, senior-level handling. My core expertise is in Windows desktop development using C#, WPF, WinForms, and the .NET Framework. I also have extensive experience supporting and modernizing legacy systems built with VB.NET, VBA, C++, and Delphi, including Office automation, custom installers, file system integration, and data-processing tools. For modernization and supporting services, I work with .NET Core, ASP.NET, Razor Pages, and REST APIs, which allows me to evolve legacy desktop systems, build internal web tools, or deliver complete end-to-end solutions when needed. I follow proven architectural practices such as MVVM, layered design, version control with Git, and predictable deployment processes. I’ve completed 120+ projects and 37,000+ hours on Upwork, working primarily on long-term and technically demanding systems where reliability, clarity, and ownership matter more than quick fixes. If you’re looking for a dependable senior .NET developer who can take responsibility for an existing system or build a stable desktop application from scratch, I’d be happy to discuss your project.

I am an educated (university level with Microsoft and Symantec certificates) and experienced software and web developer (Visual C#, ASP.NET(Core), SQL Server, Kendo UI, JavaScript, OpenAI, React, Angular, NodeJS ) located in Serbia. I have extensive experience building Windows, web applications, database solutions, and scrapers. I can work as a standalone developer or as part of a team.

Hi! My name is Sharron and I have been working with data for a very long time! I very much enjoy meeting new people and discussing their current data/information problems and then developing possible solutions when it comes to accessing necessary data more quickly. I like to listen to what my clients are looking for, and then develop a step by step solution that will meet their needs. I believe that I not only have the technical expertise to create solutions, but I also have the soft skills to help facilitate the communication of technical terms into everyday language and to design a system that is customized to my clients' individual needs. Because I majored in Industrial Engineering, developing efficient processes is part of every one of my data projects. I will either take your process that you already love and want to automate, or I can suggest ways to improve efficiency for you. I also like to keep the communication loop open to make sure I am delivering on what I promised to you. I can also make training videos to help facilitate that process. My particular areas of expertise include SQL Server, Microsoft Access, Microsoft Excel, Microsoft Office, and Visual Basic for Applications (VBA), especially with Microsoft Excel and Access. I have over 30 years of experience with Microsoft Office and including Access and Excel and the VBA and SQL languages. I have over 20 years of experience as a SQL developer. I also have over a decade of experience with social media management and classic web technologies such as ASP classic, HTML, and JavaScript as well as Visual Basic. I have two decades of training as an educator in technological fields, end user training, and K-12 learning. I can create training videos for technical training as well as training videos for the custom applications that I create. I have worked with a wide spectrum of clients, including those from manufacturing, quality control, distribution, food, pharmaceuticals, health care, financial, media, education, real estate, and service organizations. I am able to implement the entire technical solution from the initial specifications from the customer to the final implementation with training. Clients I have worked with include Avery Dennison, DRS Power Technology, North Central Mass Chamber of Commerce, Johnny Appleseed Visitor Center, City of Westhampton, Standard Register Corporation, Hillshire Farms & Kahn’s, Square D Company, Gallatin Steel, Dwyer Concrete Lifting, Procter & Gamble, Gibson Greetings, H.P. Hood Inc., Skyline Chili, Good Samaritan Hospital, Cincinnati Financial Corporation, Great American Insurance, American Annuity Group, Huff Realty, Q102 Radio Station, Dayton Public Schools, Electronic Classroom of Tomorrow (eCot), IBM Global Services, Hardware Deployment for GE Capital, Xerox Connect, Xerox, City of Louisville, MAX Technical Training, HCCM CHEC and MACH homeschooling organizations, BBC and HBC churches, Worcester Polytechnic Institute, and The University of Cincinnati.