Outsource Xamarin Development and .NET MAUI Migration
Xamarin reached end of life in May 2024. Microsoft stopped shipping patches, and the tooling won't support upcoming iOS and Android SDK requirements. But your Xamarin apps didn't stop running — and your users don't care about Microsoft's release calendar. They care that the app works.
Siblings Software is a Miami-based software outsourcing company with active Xamarin and .NET MAUI expertise on staff. We maintain production Xamarin apps for companies that aren't ready to migrate yet, run phased migrations to .NET MAUI when the timing makes sense, and build new cross-platform mobile applications for teams that want to stay in the C# and .NET ecosystem.
Our engineers in Miami, Buenos Aires, and Cordoba cover overlapping time zones with U.S. and European clients. Real-time collaboration, not async email chains.
Xamarin in 2026: What You Actually Need to Know
Microsoft ended official Xamarin support in May 2024. Their support policy page spells it out clearly: Xamarin.Forms, Xamarin.iOS, and Xamarin.Android no longer receive security patches or bug fixes. Apple will require current SDK versions for App Store submissions, and Xamarin's toolchain can't target them.
But here's what most "migrate now!" articles leave out: migration isn't always urgent, and it's rarely simple. If your Xamarin app runs on managed internal devices with controlled OS versions — field tablets, warehouse scanners, kiosk hardware — you probably have more runway than vendors want you to believe. If your app is consumer-facing and needs regular App Store updates, the clock is ticking faster.
We've been working with Xamarin since the Mono project days, well before Microsoft acquired it in 2016. That history gives us perspective that newer shops don't have. We help companies figure out where they actually stand — how much migration effort their specific codebase requires, which dependencies have .NET MAUI equivalents and which don't, and whether a phased approach or a parallel rewrite makes more financial sense. Not every app needs the same playbook.
Xamarin Services We Deliver
Three things companies need from a Xamarin partner right now. We do all of them, and we're honest about which one your situation actually calls for.
Xamarin App Maintenance
and Ongoing Support
Your app still has users and still generates revenue. It needs bug fixes, performance monitoring, and someone accountable when something breaks. We provide ongoing Xamarin maintenance — including .NET-level patches where applicable, crash monitoring via App Center, and incremental improvements that keep your app functional while you plan what's next.
.NET MAUI Migration
Phased and Tested
.NET MAUI is Microsoft's successor to Xamarin.Forms — same C# language, improved performance, single-project structure, and continued platform support. We audit your codebase, catalog every NuGet package and custom renderer, and build a migration plan that doesn't require shutting down your existing app. Most migrations take 3 to 8 months depending on complexity.
New Cross-Platform Apps
with .NET MAUI
Starting a new project? We build cross-platform applications using .NET MAUI for companies that want shared C# codebases across iOS, Android, and Windows. If your team already has .NET backend experience, this eliminates the language barrier between server and mobile code entirely.
Not sure which service fits? That's normal. Most clients start with a scoping call where we assess the situation and recommend the approach that costs least and delivers most. Sometimes that means maintenance only. Sometimes it means migration. Occasionally it means neither — we've told companies their app is fine as-is and they should spend the budget elsewhere.
How a Xamarin Engagement Works
We've refined this process across dozens of mobile engagements. It's not theoretical — it's what we actually do, week by week.
Week 0: Scoping Call
45-minute conversation to understand your situation. What's the app? How many users? What platforms? Is migration urgent or exploratory? We follow up with a written proposal within 3 business days. No commitment, no cost.
Weeks 1-2: Technical Assessment
We need repository access. Our engineers audit architecture patterns, dependency versions, custom renderers, test coverage, and CI/CD pipelines. Output: a risk-rated dependency list, estimated migration effort per module, and recommended sequencing.
Weeks 3+: Execution
Two-week sprints with weekly demos. For maintenance, we integrate into your existing workflow (Jira, Linear, Azure DevOps). For migrations, we run legacy and .NET MAUI branches in parallel until the new version is validated.
Handoff & Knowledge Transfer
Documentation, recorded walkthroughs, and pairing sessions with your internal team. We don't want you dependent on us permanently — unless that's the arrangement you prefer.
Engagement Models and Approximate Pricing
We offer three engagement structures. Pricing depends on team composition, seniority, and scope — these ranges give you a realistic starting point before we talk specifics.
Project-Based (Fixed Scope)
$40,000 – $180,000 typical range
Defined migrations or feature builds with clear requirements. You get a fixed timeline, milestone-based payments, and a dedicated squad. We own the delivery and report progress weekly.
Best for: companies that know what they need and want a clear finish line.
Dedicated Team (Monthly Retainer)
$12,000 – $35,000/month per engineer
Engineers embedded in your workflow, attending your standups, using your tools. Best for ongoing maintenance, continuous feature development, or long-term migration programs.
Hire a Xamarin team through our dedicated teams model.
Staff Augmentation (Individual Devs)
$8,000 – $16,000/month per developer
Need a senior Xamarin/MAUI engineer or a QA automation specialist? We place vetted developers on your team within 5 to 10 business days with documentation and knowledge transfer from day one.
Hire individual Xamarin developers through staff augmentation.
All pricing varies by engagement complexity, team size, and duration. We provide detailed quotes after the scoping call — not ballpark figures over email.
Outsourcing vs. Freelancers vs. In-House: A Practical Comparison
For Xamarin specifically, outsourcing makes the most sense because the skill is niche and aging. Building an in-house Xamarin team in 2026 is like hiring Objective-C developers in 2020 — technically possible, practically unwise.
In-House Hiring
Pros: Full control, cultural alignment.
Cons: Good luck finding a Xamarin developer in 2026. The talent pool has moved to Flutter, React Native, or .NET MAUI. Expect 3-6 months to hire at $120K-$180K salary (U.S.), plus benefits and management overhead.
Freelancers
Pros: Flexible, lower upfront commitment.
Cons: Availability gaps, no backup if they get sick or leave, limited accountability. For a 6-month migration, freelancer risk compounds every month. One person leaving mid-project can set you back weeks.
Outsourcing Partner
Pros: Pre-vetted team, backup bench, process discipline, structured handoffs. Institutional knowledge, not just individual effort.
Cons: Less face-to-face (though we're in overlapping time zones), initial ramp-up period to learn your codebase.
Case Study: FleetPulse Technician App
How we helped a U.S. fleet management company consolidate three separate apps into one Xamarin solution, cutting inspection time by 74%.
The Problem
FleetPulse had 1,200 field technicians juggling three different mobile apps daily — one for work orders, one for vehicle inspections, one for parts inventory. Each app was built on different technology, maintained by a different team, and deployed through a different process. Technicians spent up to 30 minutes per inspection switching between apps and re-entering data. The bigger headache was connectivity: many technicians worked in remote areas with spotty or zero cellular coverage, and all three apps required constant internet access.
What We Built
A unified Xamarin.Forms application that consolidated all three apps into one cohesive experience. We designed an offline-first architecture with local SQLite databases so technicians could complete inspections without connectivity — data synced automatically when signal returned. The app featured barcode scanning for parts lookup, integration with vehicle diagnostic systems, and touch-optimized interfaces for ruggedized Windows tablets used in warehouses. Backend: Azure Functions ingesting telematics data and synchronizing work orders.
Results
- 74% reduction in inspection time — from 30 minutes down to under 8 minutes per inspection.
- Real-time dispatch dashboards built with SignalR, reducing vehicle wait time by 32%.
- Single codebase across iOS, Android, and Windows with device-specific renderers for native feel on each platform.
- Zero severity-one incidents in the first six months of production.
"Siblings Software collapsed three legacy apps into one without slowing our crews. The team was honest about trade-offs, handled compliance with ease, and left us with playbooks we now use on every rollout." — Director of Field Technology, FleetPulse
After launch, we trained FleetPulse's internal developers, documented deployment playbooks, and transitioned to a shared support squad for ongoing releases. Browse our full case studies library for more examples.
What Companies Usually Get Wrong About Xamarin Migration
After working on enough Xamarin projects, certain patterns keep showing up. These are the most expensive mistakes we see — and the ones we actively steer clients away from.
Treating migration as a full rewrite
The most expensive mistake. Companies decide to rewrite their Xamarin app from scratch in Flutter or React Native instead of migrating to .NET MAUI. If your codebase is 80% C# business logic and 20% UI layer, you're throwing away 80% of working, tested code. .NET MAUI preserves your C# investment. A rewrite in a different language doesn't.
Waiting for the "right" time
There's no perfect moment. Apple and Google keep raising SDK requirements. Every quarter you wait, the gap between your Xamarin toolchain and current platform requirements gets wider. You don't need to migrate tomorrow, but you do need a plan with dates on it. We help build those roadmaps.
Underestimating custom renderers
Xamarin.Forms custom renderers are the single biggest migration pain point. If your app has 30+ custom renderers, expect 40-60% of your total migration effort to concentrate there. .NET MAUI replaced renderers with handlers — a better architecture, but the conversion is manual and requires understanding both systems. We audit renderers first so there are no budget surprises.
Skipping the dependency audit
NuGet packages that worked fine in Xamarin may not have .NET MAUI equivalents. We've seen companies start migration only to discover that a critical library was abandoned two years ago. We check every dependency — NuGet packages, native bindings, and third-party SDKs — before writing a single line of migration code.
Risks of Outsourcing Xamarin Work (and How We Handle Them)
Outsourcing isn't risk-free. Here's what can go wrong and what we do about it — because pretending risks don't exist doesn't make them disappear.
Your partner doesn't actually know Xamarin
Many agencies claim Xamarin expertise because it's technically C#. Understanding the renderer pipeline, platform quirks, and the .NET Upgrade Assistant tooling takes years of hands-on work.
Our approach: We assign engineers based on their actual Xamarin project history. You meet the team before the engagement starts.
Migration breaks the production app
The scenario that keeps CTOs up at night. We handle it by running parallel branches — the legacy Xamarin app stays deployable while the .NET MAUI version matures. No cutover until automated tests pass, QA confirms feature parity, and your team signs off.
Our approach: Staged rollouts, device-lab testing, and your explicit approval before any production changes.
The project runs over timeline
Migrations are unpredictable because legacy code wasn't written with migration in mind. We mitigate this with detailed upfront assessment so estimates start grounded in reality, plus transparent biweekly reporting so you see progress continuously — not just at the finish line.
Our approach: Modular delivery so working pieces ship even if the overall timeline shifts.
Nearshore Xamarin Teams in U.S. Time Zones
Our engineers in Miami, Buenos Aires, and Cordoba share 4 to 6 overlapping hours with Eastern and Central U.S. time zones. Standups, pair-programming sessions, and design reviews happen in real time — not through overnight Slack messages that get answered 12 hours later.
This overlap matters more for Xamarin work than most technologies. Platform-specific decisions, renderer customizations, and device-lab results require back-and-forth discussion that breaks down in async handoffs. When your QA engineer finds a rendering issue on a specific Android device, our developer can see it on the same device in our lab within the hour — not the next business day.
For broader nearshore staffing, explore our nearshore developer hiring service. For offshore arrangements with European companies, we adapt schedules and use structured handoff protocols — see our offshore staffing page.
Why Xamarin Still Matters (and When .NET MAUI Is the Better Path)
Most cross-platform tools force a trade-off: write everything in a shared language and accept UI compromises, or maintain separate codebases and pay the coordination tax. Xamarin changed that calculus by bringing C# to iOS and Android through Mono bindings. The approach worked — and for teams with existing .NET investments, the code-sharing model still holds up.
The practical appeal was always straightforward. Business logic, data validation, authentication flows, and API clients live in a single C# project. When you need platform-specific features — ARKit on iOS, the Android camera pipeline, Windows Ink — Xamarin gives direct API access without rewriting everything. Microsoft's architecture documentation explains the code-sharing model in detail.
For new projects, though, .NET MAUI is the clear successor. It offers better startup performance (Microsoft reports 40% faster cold starts in benchmarks), a unified project structure, and — critically — ongoing platform support. If you're choosing between starting a new Xamarin project or a .NET MAUI project in 2026, the answer is .NET MAUI every time. If your product needs a different ecosystem entirely — say, Dart and the Google toolchain — our Flutter development outsourcing team can evaluate that alternative.
How We Approached the BinSensors Smart City Project
Cross-platform delivery combining backend APIs, a web portal, and mobile sensor integration across multiple cities.
BinSensors is a smart waste management platform used by garbage collection companies to monitor bin fill levels in real time. The system includes hardware sensors, a mobile companion for field crews, and a web dashboard for operations managers planning collection routes.
Our three-person team (backend engineer, frontend engineer, project manager) delivered a REST API, a web portal for bin tracking and driver management, and statistical dashboards that helped fleet managers cut fuel consumption and driving time. The cross-platform mobile layer meant drivers on different devices could receive route updates without maintaining separate apps per OS — the same delivery pattern we apply to Xamarin and .NET MAUI engagements.
Over the past year the platform contributed to 50,000 gallons of fuel saved, 25,000 driving hours eliminated, and adoption by 12 collection companies across 5 cities. Read the complete breakdown in our BinSensors case study.
Key Outcomes
- 50K gallons of fuel saved in one year
- 25K driving hours eliminated annually
- 12 companies across 5 cities using the platform
- Full delivery by a 3-person squad
About Siblings Software
We're a U.S.-based software outsourcing company with offices in Miami, Buenos Aires, and Cordoba. We've been delivering mobile and web applications since 2014, across healthcare, logistics, fintech, and field operations. Our Xamarin practice started during the Mono era and evolved through every major Xamarin release.
Beyond Xamarin, we help companies scale through staff augmentation, dedicated teams, and full project delivery. Our published case studies document results across industries.
Frequently Asked Questions
Xamarin works, but Microsoft ended official support in May 2024. No security patches, no new platform SDK support, no bug fixes. Apps on controlled internal devices may have more runway. Consumer-facing apps that need App Store updates face tighter deadlines — Apple now requires SDK versions that Xamarin's tooling cannot target. Most companies are evaluating a transition to .NET MAUI, Microsoft's direct successor.
Depends on your app. A straightforward data-entry app with standard UI and few custom renderers: 10 to 14 weeks. An enterprise app with offline sync, 30+ custom renderers, and third-party SDK integrations: 5 to 8 months. We give you a detailed estimate after auditing your codebase — not before.
Yes. We provide ongoing maintenance — bug fixes, minor features, monitoring, and incident response. But we'll be direct: maintenance buys you time, it doesn't solve the underlying end-of-life problem. We typically help clients maintain production while building a migration roadmap in parallel so neither workstream blocks the other.
Project-based engagements typically range from $40,000 to $180,000. Dedicated engineers cost $12,000 to $35,000 per month depending on seniority. Individual staff augmentation placements run $8,000 to $16,000 per month. Exact pricing depends on scope, team size, and duration — we give you a real number after the scoping call, not a generic range on a landing page.
Nothing. We run the migration in parallel branches. Your existing Xamarin app continues to work normally while the .NET MAUI version is built alongside it. We don't touch production until the new version has been tested, validated against your acceptance criteria, and explicitly approved by your team.
Absolutely. If you're starting from scratch in 2026, .NET MAUI is the right choice for teams that want shared C# code across iOS, Android, Windows, and macOS. We build new .NET MAUI apps using the same sprint-based, device-tested delivery process. For alternative cross-platform frameworks, see our Flutter and app development pages.