I’m Devni Heraliyawala, a .NET Technical Lead focused on enterprise platform architecture, modernization, workflow automation, cloud integrations, and SaaS product delivery. My work spans complex operational systems, runtime-configurable workflows, Azure-based modernization, integration architecture, and technical leadership across business-critical applications.
Each project below started as a complex operational or architectural problem. Here's the short version — open a case study for the fuller picture.
A personal, pay-per-reading astrology product: birth-chart calculations run locally, while Claude generates the plain-English readings — with Stripe payments, a bilingual English/Sinhala experience, and privacy-first storage.
Shipped a full-stack product spanning a local astronomy engine, AI-generated readings, payments, and a privacy model where birth details and readings auto-delete after 24 hours.
The online home of paper crew., a boutique paper studio in Sri Lanka crafting custom wedding invitations, cake boxes, gift packaging, and printed stationery — designed and built end to end.
Shipped a fast, brand-led site that presents the studio's full made-to-order range and routes enquiries straight into the WhatsApp and Instagram channels where orders actually happen.
Architecture and delivery of an automation platform for provisioning, upgrades, rollback, IIS operations, SQL Server restore workflows, Azure Blob Storage, and operational auditability.
Turned fragile operational procedures into repeatable, auditable, API-driven workflows with better reliability, visibility, and recovery paths.
Redesign of hard-coded job definitions and maintenance templates into configurable workflow and reporting systems.
Enabled new job types, forms, report structures, and operational workflows to evolve with less engineering dependency.
Modernized attachment storage by moving SQL Server-stored binary data to Azure Blob Storage with migration tooling and verification.
Improved storage scalability, reduced database pressure, and created a cleaner long-term cloud storage strategy.
Client-requested enterprise SaaS/product architecture for field service, compliance-led operations, digital forms, workforce workflows, assets, reporting, and automation.
Shaped AtlasOS into a coherent product architecture that connects field operations, compliance workflows, workforce activity, assets, reporting, and automation.
A whimsical, fairy-tale-themed boutique bakery site — an immersive cake and pastry gallery built around a full custom animation layer rather than a template marketing page.
Shipped a fully custom-animated bakery experience, from a Lissajous-curve flying fairy sprite to a particle-trail cursor and an interactive cake builder.
A client portfolio site for Gamini Heraliyawala, a management and strategic-planning consultant with 40+ years of experience — built to present his expertise, career timeline, and credentials.
Delivered a fast, dependency-free, accessible executive portfolio site with a distinct navy, ivory, and gold visual identity.
Azure OCR, Azure Document Intelligence, and GPT-based workflows for extracting structured data from receipts and business documents.
A published NuGet/project template for starting enterprise .NET applications with Clean Architecture, CQRS, modular boundaries, and maintainable foundations.
Integration architecture across Zoho Desk, DocuSign, SendGrid, Traccar, Bing Spell Checker, GemBox, and custom C# PDF generation.
Most engagements fall into one of these areas — often a mix of two or three at once.
Designing application boundaries, API layers, workflow engines, data models, integration points, and operational foundations for business-critical systems.
Planning and executing practical modernization paths for legacy .NET systems using ASP.NET Core, Clean Architecture, CQRS, testing, and incremental migration.
Designing configurable workflows, background processing, operational tooling, rollback paths, audit trails, and support automation for complex business operations.
Modernizing storage, database workflows, Azure integrations, blob storage strategies, SQL Server performance, and cloud-ready application foundations.
Designing reliable integration layers for third-party APIs, AI/LLM APIs (Claude), document generation, signing workflows, support platforms, tracking systems, and reporting pipelines.
Reviewing architecture, identifying risks, improving code quality, mentoring engineers, supporting sprint planning, and translating business needs into technical direction.
A field service and compliance-focused SaaS platform shaped around real operational requirements.
AtlasOS was initiated from a client request to digitize field service and compliance-led operations. I lead the technical architecture direction across workflow modelling, data structures, reporting foundations, module boundaries, and delivery decisions.
Most legacy systems aren't badly built — they're misunderstood. I start by mapping how things actually work before proposing changes.
Big rewrites are risky. I prefer steady, well-tested steps that keep the system running throughout.
Logging, rollback, and monitoring aren't afterthoughts — they're part of the design from day one.
The best architecture is one your team can explain, extend, and trust without you in the room.
A grounded view of the platforms, patterns, and tools behind the systems above — organized by area, not as a wall of tags.
Practical writing on .NET, Azure, architecture, automation, AI-assisted development, debugging, and the engineering decisions behind production systems.
AI tools are excellent at producing code quickly. They're far less reliable at deciding what should be built, and why.
Read on blog.NETLong-running operations fail mid-way in production. Here's how to design workflows that can be safely cancelled and resumed.
Read on blogAzureA practical walkthrough of moving binary attachments out of a live database without downtime.
Read on blogI’m a .NET Technical Lead on an architect-track path, focused on enterprise platforms, modernization, workflow automation, and SaaS architecture. Over the past 8+ years, I’ve worked across cloud integrations, runtime-configurable systems, database modernization, AI-assisted document workflows, enterprise integrations, and technical leadership. More recently I’ve been building AI/LLM-integrated products — pairing deterministic backend computation with model-generated output, as in Moonlyst (Claude API). I also hold an MSc in Big Data Analytics with Distinction and received a Gold Medal for Academic Excellence.
MSc in Big Data Analytics — Distinction
Gold Medal for Academic Excellence
Technical Co-Founder, AtlasOS
Employee of the Month, multiple times
Published NuGet / .NET Architecture Template
Devni.Clean.Architecture.Solution.Template — a reusable Clean Architecture and CQRS starter template for enterprise .NET applications, designed to reduce repetitive setup and encourage maintainable project structure.
View on NuGetAvailable for selected remote freelance, contract, and technical consulting work involving .NET, Azure, SaaS platforms, workflow systems, automation, and modernization.
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