Hire the Best XSLT Specialists
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I help businesses streamline their operations by automating manual processes, connecting systems, and building reliable data workflows. With 10+ years of experience across content management, scripting, and no/low-code platforms, I’ve delivered 70+ successful projects on Upwork — from building Airtable CRMs to designing end-to-end automation pipelines that save teams hours every week. Clients hire me to: - Design and optimise Airtable databases - Automate workflows using Make, Zapier, and Pipedream - Build custom scripts and web apps with Google Apps Script & JavaScript - Integrate APIs and handle complex data transformations (XML/XSLT) - Format, convert, and typeset content for MS Word, Google Docs, EPUB, MOBI, and InDesign Whether you need a quick integration, a complex automation strategy, or polished content formatting, I focus on building solutions that are efficient, scalable, and tailored to your business.

I build an auditable document-processing layer that converts real, messy, unstructured data into structured data and makes your RAG system actually work. My longest engagement ran two years on retainer — a water consultancy processing lab reports across 10+ changing layout variations, where I cut manual data entry by 75%. Based in the UK. Most clients find me after something that was partly working stops working. The extraction script handled 80% of documents fine, then broke on the rest and the team can't explain why. That's the failure mode I'm specifically set up to prevent. ──────────────────────────────────────── HOW I WORK My job is to know the failure modes before we write the first line of code. I start with the simplest approach and iterate from there. Over-engineering is the most common failure mode in document processing — reaching for LLMs when regex would do, or building custom infrastructure when a single API call would do. My pipeline development follows the same sequence every time: 1. Define the schema first If I can't describe what clean output looks like, extraction will always be unreliable. Pydantic schema before touching any document. 2. Establish a regex baseline A deterministic check tells me exactly where the hard cases are before introducing any probabilistic tool. 3. Introduce LLMs incrementally Start with the simplest prompt possible. Iterate against real documents. If a simpler rule-based approach gets you 90% of the way, I'll say so — and we'll skip the LLM. 4. Apply layout detection last Only where variation genuinely requires it. This sequence keeps pipelines predictable, testable, debuggable, and maintainable. The system that breaks on document 47 with no explanation is the most common complaint I hear from clients who've tried other solutions first. ──────────────────────────────────────── WHAT CLIENTS SAY "Thanks to Subhajit's work, we are saving countless hours having to manually enter results into our own template." "Subhajit's professionalism, meticulous attention to detail, and expert handling of our project were apparent from the outset." "He always delivers great results. His communication is clear, he takes feedback well, and he consistently finds effective solutions." ──────────────────────────────────────── WHAT I DO IDP Diagnostic & Action Plan — fixed price If your document pipeline is failing or underperforming, I audit your current approach, identify failure points, and deliver a written action plan with execution steps. Implementation is optional and available on request. Document Extraction Pipeline I build systems that extract structured data from PDFs, invoices, lab reports, contracts, and email attachments. They handle layout variation and format drift — the things that break simpler solutions in production. System Integration & Ongoing Support I connect extraction pipelines to downstream systems: Excel, databases, APIs, and internal tools. Retainer support is available as your document types evolve. ──────────────────────────────────────── RESULTS - Cut manual data entry by 75% for a water consultancy processing lab reports across 10+ changing layout variations - Maintained and expanded over a two-year retainer — the system became central to the client's daily operations - Extended the pipeline to process email attachments directly, removing a manual download-and-upload step ──────────────────────────────────────── TECHNICAL STACK Document Processing: pdfplumber, PyMuPDF LLMs & Extraction: OpenAI API (GPT-4o-mini) Validation & Structure: Pydantic, JSON schema Backend & APIs: FastAPI, REST API design Databases: PostgreSQL Version Control: Git, GitHub ──────────────────────────────────────── LET'S START SMALL Start with a Diagnostic Session. Fixed price: $250. You share your documents and describe the problem. I review your current approach, identify the exact failure points, and deliver a written action plan with implementation steps. No long commitment. If you choose to proceed, we scope the full pipeline together. If not, you still have a concrete plan you can share with anyone. Send me a message with a brief description of your document problem. I'll tell you within 24 hours whether I can help and how.

Enthusiastic, talented Senior Software Engineer with excellent programming skills, strong problem-solving abilities, quality-driven and customer-focused. Passionate not only about technology but also about applying it to improve people’s lives in new and innovative ways. Experienced in handling the entire software development life cycle, and used to working with a wide variety of technologies. A constant learner who motivates their peers. Self-motivated, positive, proactive and pragmatic, communicative and collaborative, and ready to take responsibility and ownership. EXPERTISE • Strong experience with Python, Go, Java, C, C++ and Lua; • Good Knowledge of Ruby and Js; • Solid experience with object-oriented design, and design patterns; • Experienced with UNIX operating system, including Linux for development and basic administration; • Familiarity with databases such as PostgreSQL, Oracle, MySQL and PL/SQL; • Experienced with OpenGL, 3D graphics, and ima​ging; • Great Computer Vision and OpenCV experience; • Good experience working with GUI development such as QT, Swing, and IUP; • Familiar with Web development: J2EE, Spring MVC, Tomcat, JSP, Servlets, JSF, HTML, CSS; • Good Knowledge with Multi-threaded and Client- Server programming; • Strong experience in design, unit testing, reviews, system testing, and requirements; • Experienced with all phases of product development lifecycle; • Experienced with source control systems like CVS, Subversion, JIRA, Buildbot and Hudson; • Familiar with agile methodologies as well as software planning and estimation techniques; • Strong commitment to life-long learning, enjoying teaching and mentoring; • Team oriented, encouraging the use of conventional procedures, practices, and tools; • Excellent written and verbal communication skills (English and Portuguese).

As a .NET developer, I am a skilled software developer who specializes in creating applications using the Microsoft .NET Core. I have a strong understanding of programming concepts and are proficient in languages like C#. My primary role is to design, develop, and maintain applications using the .NET framework. This involves working with various tools and technologies to build desktop, web that run on Windows operating systems and other platforms. I am also adept at working with different software development methodologies such as Agile or Scrum and are able to work collaboratively with other team members, including project managers, designers, and other developers. 🔥 What I specialize in: C# / VB.NET Desktop Application Development (WinForms, DevExpress) SQL Server performance tuning & query optimization ERP & Accounting Systems (Inventory, GST, Reporting) QuickBooks Desktop Integration (QB SDK, automation, sync) Fixing slow applications caused by database or code issues Excel/VBA → .NET Application or DLL Conversion API integrations & system synchronization Auto-updaters (Application + Database migration) Industrial systems (Serial Port, Bluetooth, real-time control) 💡 Proven real-world experience: ✔ Inventory & Billing Systems with DevExpress ✔ Custom CRM & HRM Solutions (Multi-User) ✔ Financial Dashboards with Real-Time Charts ✔ Booking & Scheduling Tools with Reminders ✔ Secure Login & Licensing Applications ✔ ERP system for diamond industry (high-volume transactions) ✔ Optimized SQL performance for business-critical systems ✔ QuickBooks automated order & invoice sync ✔ Bulk email automation system (Google API integration) ✔ Excel VBA converted to scalable VB.NET DLL ✔ API-based auto-update system with database upgrades ✅ Technical Expertise ✔ Languages & Frameworks: C#.NET, VB.NET, WinForms, Desktop Application, .NET Framework, .NET Core ✔ UI Frameworks: DevExpress, Custom Controls ✔ Backend Logic: Complex Business Rules, Data Processing, API Integrations ✔ Databases: SQL Server (Advanced) - [Stored Procedures, Functions, Triggers, Query Optimization, Performance Tuning, Indexing & Execution Plans], Oracle Database, MS Access, Database Design & Architecture, Data Migration & Integration ✔ Extras: Reporting, Printing, Multi-language Apps, Licensing Systems, Crystal Reports / RDLC Reporting, Git Version Control ⚡ Why clients hire me: ✔ 14+ years of strong industry experience ✔ Expert in C#, .NET, and enterprise application development ✔ Strong database optimization and performance tuning skills ✔ Experience in SQL Server, Oracle, and MS Access ✔ Strong experience with real-world business systems (ERP) ✔ I quickly identify performance bottlenecks and fix them ✔ Focus on speed, stability, and long-term scalability

Experienced Automation, AI Workflow, and Database Systems Developer helping businesses replace manual processes with reliable, data-driven software. I design and build custom workflow platforms, internal business tools, automation scripts, API integrations, reporting dashboards, and AI-assisted systems using PHP, Python, JavaScript, MySQL, PostgreSQL, Docker, REST APIs, PowerShell, Bash, and cloud infrastructure. My background spans infrastructure automation, database design, DevOps, SaaS-style web applications, document workflows, approval systems, reporting, and system-to-system integration. I am particularly strong at taking messy operational processes — spreadsheets, emails, manual approvals, disconnected systems — and turning them into structured, auditable, automated platforms. Core skills include: * Workflow automation and process improvement * AI-assisted business systems and LLM integrations * PHP, Python, JavaScript, Node.js, and API development * MySQL and PostgreSQL database design, queries, reporting, and optimisation * Docker-based development and deployment * PowerShell, Bash, cron jobs, and scheduled automation * REST API integrations with third-party platforms * Approval workflows, document handling, audit trails, and dashboards * Cloud and infrastructure automation across AWS, GCP, VMware, and Linux environments * Git, Jira, Ansible, JSON, XML, and CI/CD-style deployment practices I combine strong technical depth with practical business understanding, helping clients build systems that save time, reduce errors, improve visibility, and scale beyond manual admin.

Are you looking for a reliable, Azure-certified .NET developer who builds modern, scalable, and secure applications using the latest technologies? With 8+ years of professional experience, I specialize in full-stack .NET development — from robust Web APIs and .NET MVC applications to cloud-native systems and data-driven platforms. What I Can Do for You: 🚀 Full-Stack .NET Development • ASP.NET Core (latest LTS), .NET 6/7/8 • .NET MVC with modern Razor patterns • Blazor Server & WebAssembly 🔗 Web API & Integrations • RESTful API design & development • API versioning, Swagger / OpenAPI • Secure APIs with JWT, OAuth2, Entra ID • High-performance, scalable endpoints ☁️ Cloud & DevOps • Azure App Services, Functions, Container Apps • CI/CD pipelines (Azure DevOps, GitHub Actions) • Key Vault, App Insights, monitoring & logging 🔐 Identity & Security • Microsoft Entra ID / Azure AD B2C • External logins (Google, Microsoft) • OAuth2 & OpenID Connect 💳 Payments & FinTech • Adyen integrations: Drop-in, Express Checkout, Apple Pay, Google Pay, 3DS, recurring billing 🗄 Databases & Data Layer • SQL Server – stored procedures, indexing, tuning • MongoDB – scalable NoSQL design • Azure Cosmos DB and blob Storage– partitioning, performance optimization • Entity Framework Core & LINQ 📨 Messaging & Background Jobs • RabbitMQ, Quartz.NET • Event-driven & async processing 🎨 Frontend & JavaScript • Modern JavaScript (ES6+) • Bootstrap, HTML5, CSS3 • Dynamic UI with Blazor and MudBlazor 🧪 Testing & Quality • xUnit, Moq, unit & integration testing • SOLID principles, clean code, TDD practices 🧩 CMS Solutions • Umbraco & Optimizely custom development Certifications: • Microsoft Azure Associate Developer (AZ-204) • Power Platform Fundamentals (PL-900) • RPA Developer Foundation Training Why Clients Choose Me ✔ Top-Rated on Upwork with proven delivery ✔ 8+ years of real-world .NET experience ✔ Clear communication & agile delivery ✔ Strong problem-solving mindset ✔ Long-term, client-focused partnership Let us collaborate to modernize your legacy applications or develop high-performance solutions that will propel your business forward. Contact me today to begin!