Windows App Development Company · New Delhi, India · Since 2010
Windows Apps Built byDevelopers Who Ship to the Store.
ACSIUS Technologies is a Windows app development company building WinUI 3, .NET and WPF desktop software — discovery, UI/UX, engineering, MSIX packaging, code signing and Microsoft Store submission under one in-house team.
You get a named Windows lead, a signed MSIX build on your own machine every week, and C# source code in your repository from the first commit.
- 0+
- Years building software
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- Desktop apps shipped
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- Designers & engineers
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- Typical v1 build
Sign in — ACSIUS.App
–▢✕Windows Hello
Face recognised · Entra ID
Windows Hello sign-in
Build
MSIX #142
Signed this sprint
Crash-free
99.8%
Gate: 99% minimum
Store
1st pass
Your Partner Center
Windows App Development Services
Four tracks inside every Windows engagement.
Choose one to see the .NET stack, the Windows APIs and what it buys you.
Modern Windows 11 apps in WinUI 3, C# and .NET 8.
Win 10+
supported baseline
Our core practice. Fluent Design surfaces, MVVM architecture, async data flow, offline-first local storage and motion that feels like the OS rather than a web page in a frame. Built to Microsoft's own design and packaging guidelines so Store certification is a formality.
- Keyboard, mouse, pen and touch input handled properly
- Light, dark and high-contrast themes plus Narrator support
- Live tiles' successors: widgets, toasts and jump lists
Stack we use
Straight Answers
Framework, Store, ownership.
Four decisions every desktop product owner has to make, answered without the sales layer.
WinUI 3, WPF or Electron for a new desktop app?
If the app needs real desktop performance, hardware access, offline data or a Windows 11 look, WinUI 3 with .NET is the right call. WPF still wins for dense line-of-business grids and teams with existing XAML skills. We only recommend Electron when the same product must run on macOS and Linux and the UI is mostly forms and dashboards — and we will say so plainly instead of selling you a rewrite.
How does Microsoft Store certification get handled?
We prepare the MSIX package, capabilities manifest, code-signing certificate, listing copy, screenshots and age rating, then submit under your own Partner Center account and answer certification failures ourselves. Most of our submissions clear on the first pass because policy checks happen during QA, not after.
Who owns the C# code and the Partner Center account?
You do. The Visual Studio solution lives in your Git from the first commit, the app is published under your Partner Center account, and design files, signing certificates and pipelines move to your team on payment. Nothing is tied to ACSIUS for future work.
Can you take over an existing Windows application?
Regularly. We start with an architecture, dependency and licence audit, then send a prioritised list of crashes, technical debt and quick wins with effort estimates. Work continues on a branch with CI so your live app keeps running while we stabilise it.
Ways To Engage
Three ways to start, one written scope.
Windows v1 sprint
WinUI app with 4–6 core screens, one integration, telemetry and a signed installer. Built to be used by real operators, not to win an award.
- Best for
- Founders and new product bets
- Timeline
- 8–10 weeks
Full Windows product
Desktop app, backend, admin dashboard, licensing, auto-update, device integrations, QA coverage and Store launch under your Partner Center account.
- Best for
- Funded startups and SMBs
- Timeline
- 4–6 months
Dedicated Windows pod
Hire Windows app developers in India as an embedded pod — engineers, designer and QA in your standups, sprints and repo, scaling month to month.
- Best for
- Enterprise and product teams
- Timeline
- From 1 month
How We Build
Idea to signed installer in six phases.
Every phase ships something you can open, click or install. No hidden gates.
- 01Week 1–2
Product & platform scope
Workshops on users, workflows and must-have vs later. You leave with a feature list, a Windows version baseline and a written phased scope.
Scope doc + roadmap
- 02Week 2–3
Desktop UX prototype
Clickable prototype of the core workflows using native Windows patterns, tested with real operators before a line of C# is written.
Figma prototype
- 03Week 3–4
Fluent design system
Components, states, empty states, icons, keyboard maps and theme tokens — a XAML system your future engineers can extend, not redraw.
Design system
- 04Week 4–11
.NET sprint engineering
Two-week sprints across app and backend, each closing with a signed MSIX build you install on your own machine.
Weekly signed builds
- 05Rolling
Device & policy QA
Functional, performance, accessibility and Store policy passes across Windows 10 and 11, multiple DPI settings and locked-down enterprise machines.
Test + policy report
- 06Launch +30d
Store launch & rollout
Listing, screenshots, code signing, submission, certification replies, phased rollout, crash monitoring and 30 days of post-launch support.
Live on Microsoft Store
Milestone invoicing, weekly signed builds, and your repo from the first commit.
Need downloads, not a website?
One landing page + Google Ads to drive app downloads.
Plenty of software owners only need a single high-converting page: a place for Google Ads, Microsoft Ads and social traffic to land before the download button. We design, build and run it as a standalone package.
Single conversion page
One page — hero, proof, screenshots, FAQ and download buttons. Live in days, no CMS to learn.
Google & Microsoft Ads
Search, Performance Max and Bing campaigns structured around download and demo-request intent.
Tracking that actually works
GA4, offline conversion imports and install or trial events wired before a rupee of spend goes out.
Creative & A/B testing
Ad copy, banner sets and two hero variants tested weekly so cost per download keeps falling.
Typical 90-day movement
+2.3×
CTR
−36%
Cost per download
+29%
Trial CVR
8–10
Quality Score
- One page, no CMS, live in days
- Google Ads + Microsoft Ads managed monthly
- Download and demo events tracked end to end
Windows Apps We Build
Sector-shaped desktop software, not a rebadged template.
Eight categories we have shipped repeatedly, each with its own architecture.
ERP & line of business
Dense grids, roles, approvals, reporting and offline-tolerant sync.
POS & retail counters
Barcode scanners, receipt printers, cash drawers and offline billing.
Manufacturing & IoT
Serial and USB device reads, shop-floor dashboards, alarms and logs.
Healthcare desktop
Records, DICOM viewers, consent-first data and audit-ready trails.
Finance & accounting
Ledgers, reconciliation, statement imports and signed audit exports.
Media & creative tools
GPU rendering, large-file pipelines, drag-and-drop and pen input.
Kiosk & digital signage
Locked-down shell, assigned access, remote content and health pings.
Utilities & agents
Tray apps, background services, schedulers and silent auto-update.
How We Work
Delivery commitments, in numbers.
To a written scope
Feature list and phased plan
Sprint cadence
Signed build every sprint
Typical certification
Policy checks inside QA
Timezone overlap
US, UK, EU, AU and Middle East
Crash-free gate
Release blocked above budget
Free post-launch support
After every go-live
Why ACSIUS
A Windows partner you can audit.
16+
Years
70+
Desktop apps
30d
Support
<1%
Crash gate
Store certification handled
MSIX packaging, capabilities, code signing, listing and certification replies are our job — submitted under your own Partner Center account.
Weekly signed builds
From sprint two you install the real app on your own machine every week. Progress you can click beats a status report you have to trust.
Real device coverage
Windows 10 and 11, multiple DPI and language settings, low-spec machines and locked-down enterprise images — because your users are not on your dev box.
Your repo, your certificate
C# code in your Git from the first commit, signing certificates and pipelines handed over, no lock-in to us for version two.
Enterprise IT ready
Silent install switches, per-machine deployment, Intune and Group Policy notes so your IT team can roll it out without calling us.
We stay after launch
30 days of free post-launch support, then care plans covering Windows releases, .NET upgrades, crash triage and iteration sprints.
Send your idea and get a free Windows scope call.
No lock-in, no hidden phases, no demo theatre.
FAQs
Windows app development, answered.
Send us your idea, a competitor app or your existing Visual Studio solution and we'll tell you what we would build and how long it takes.
Talk to a Windows LeadSixteen years of delivery, an in-house salaried team of 40+ designers and engineers in New Delhi, 70+ desktop apps in production, and a method built on weekly signed builds instead of monthly slide decks. We publish under your Partner Center account and hand over C# source code, so our record has to stand on its own rather than on lock-in.
Discovery and scoping, desktop UX and Fluent design systems, WinUI 3, WPF and WinForms engineering, .NET backends and APIs, device and hardware integrations, licensing and auto-update, QA across Windows 10 and 11, MSIX packaging with code signing, Microsoft Store submission, and post-launch support plans.
You get senior C# and XAML engineers with 4–5 hours of daily overlap with US, UK, EU and Middle East teams, at Indian delivery rates but with in-house accountability — no freelancer churn, no unnamed resources. Every engagement has a named Windows lead who joins your standups and owns the release.
Both, and we recommend the honest option. Native WinUI 3 or WPF with .NET when the app needs desktop performance, hardware access, offline data or deep OS integration. Cross-platform with .NET MAUI or Electron when the same product must also run on macOS or Linux and the interface is mostly forms, grids and dashboards.
Discovery and UX take 2–3 weeks, a focused v1 build 8–10 weeks, and a full-feature Windows product 4–6 months including QA and Store certification. You install a signed build every sprint from week four, so timelines are verified by working software rather than percentages.
Yes, and it is a large part of what we do. We audit the architecture, dependencies and licences, upgrade .NET Framework projects to .NET 8, rehost WinForms screens inside modern shells where a full rewrite is not justified, replace legacy installers with signed MSIX, and do it branch by branch so your live application keeps working throughout.
Yes. We prepare the MSIX package, listing, screenshots, age rating and privacy declarations, then submit and manage certification under your Partner Center account. If you would rather distribute outside the Store, we ship a signed installer with an auto-update channel and silent switches for your IT team.
Every project includes 30 days of free post-launch support. After that, care plans cover annual Windows releases, .NET and SDK upgrades, Store policy changes, crash triage and a monthly change report, with iteration sprints whenever you want new features.
Always, before any code or product detail changes hands. Access is least-privilege, credentials stay in your vault, and delivery can be aligned with HIPAA or GDPR requirements when your sector needs it.
Let's talk Windows
Ready to Ship Your Windows App?
Tell us the workflow, the users and the deadline. Within two working days you get a framework recommendation, a phased scope and the desktop apps we shipped closest to yours.
Contact
Talk to the people who'll build it.
No sales script and no gatekeeping — your first call is with a strategist and an engineer. We reply to every enquiry within 4 business hours.
- Office
- 52-A, 301-3rd Floor,Krishna Complex, Hasanpur,New Delhi-110092, India
- Phone
- +91 98 9176 4802
- info@acsius.com
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