Flutter

if you are already expert on technologies you mentioned and know exactly how to work with them you might see investition to flutter as burden. Otherwise: Just go on with flutter & flame and see if it fullfills your requirements and could fit to your exact requirements.

Generally, flutter is already solid, and usable in context you mentioned. There's also plenty of resources to test if it would be ok to you before investing a lot. Just pick a demo project, get it running, and see results.

https://flutter.dev/games

If you decide to invest you can take a working seed project generated to you

https://cli.vgv.dev/docs/templates/flame_game

Note: Flutter + Flame expect you to learn dart - it's easy, as the language is close to js / c / .. so: algol style syntax - it also expects you to understand reactive ui's - well: concept is insipired by React, so no suprises here, except that the whole concept needs some discipline.

Still to mention: For 3d games you still should see unity as solid option. And, as also with react native, you would find integration to flutter possible and supported by 3rd parties. Don't expect this to work always out of the box as a dream, but see it as a doable thing if you need to step to this road.

https://pub.dev/packages/flutter_unity_widget

As an inspiration I give you idea what kind of extensions Flutter offers, if you decide to invest on it.. This is more fun thing, but as a junior developer learning stuff and doing things out of interest this might be something to you.

https://www.youtube.com/watch?v=0CCVB31feO0

I think you should stick with the thing you know because flutter is a whole new ecosystem and you could shoot yourself in the foot with it and when you have made the app then you could learn flutter

Considering your expertise in Java and Angular, I recommend a Microservices architecture using Java Spring Boot for the backend. Angular can be utilized for the frontend. AWS is a robust choice for cloud services, and for the database, a combination of SQL (like PostgreSQL) for structured data and NoSQL (like MongoDB) for flexibility in handling unstructured data. For mobile app development, React Native offers a balance of efficiency and cross-platform capability. With a team of 5, this stack ensures scalability, maintainability, and a streamlined development process for your food delivery application.

I think you should use React or svelte and for the backend use Next.js or sveltkit and as for a database I would think you should use mongo DB and if you want to make it cross platform use flutter or React native it would be easy to use both of these if you know React they are very similar to each other and as for Next.js it is a full stack framework which uses React on the front end and nodejs at the back end good luck making the application.

If you like Postgres then Supabase, if MySQL then appwrite. Appwrite has better SDKs for dart/flutter

blazor can be used for small projects but react is in demand and easier to learn

Nowadays, you can do almost everything with every language depending on preference. If you want to start solid, I recommend JavaScript followed by TypeScript. You can make killer web apps, cross platform mobile apps with ReactNative and backend with Node.js. if you already know that you like C# you can also make web apps with it, cross platform apps with Xamarin but also Desktop apps with unity (also a must for anything game or 3d related). Kotlin is next on my list, it's a powerful language compatible with Java and you can make killer Android apps with it, if you can also leverage Swift or objective C, you can use Kotlin Multiplatform to also include iOS apps, web apps with spring and also solid backend code. Python is good if you are keen on machine learning and backend. I am a Flutter Dev myself, if you love Flutter, it can make great mobile apps with flat learning curve (it's easy) with also the ability to make anything cross platform.

In conclusion, I think starting of with JavaScript is a solid choice. If you like C#, it could be your best choice instead, and a must if you want to go into games. Thirdly, Kotlin is pretty popular and capable and loved. And finally, flutter is easy and function.

See, As you mention you know almost all the programming language but do not stick to any programming I suggest you do 9-5 jobs as per your knowledge and do at least 2 years and make it perfect. This helps you make it perfect in specific programming. I hope you got the answer.

You can use any backend you want with Flutter, so PHP is fine. AppWrite might be worth taking a look at as it is written in PHP, seems to be in active development and is geared towards being a backend for mobile apps.

Since your backend will likely expose its functionality over HTTP, you can definitely use PHP in combination with Dart/Flutter. You can use whatever as your backend.

Since Flutter is backed by Google, you get lots of great functionality out-of-the box if you are using Firebase as your backend though. You can even get very far without writing any backend-code. I would recommend having a look at that as well.

Just use the language you're most proficient and can iterate quickly with - of a, perhaps, larger concern - where is your backend?

Sure, you may be leveraging other services but I presume you're still going to log information about transactions and whatnot

I like to use nodejs with prisma ORM, you can also use Typescript, its very easy to learn and Prisma provides a own studio that helps you with the database; another option is PHP with Laravel with the Eloquent ORM, or you can still in your current stack, anyways i recommend you to use Redis from cache database, this will make your app or website very fast

While I personally tend to favor FastAPI for my projects, I think Django is the right choice for many. You'll get more feature out of the box, including an ORM, which should allow you to develop your project faster. FastAPI is indeed fast, but utilizes async Python that may be unfamiliar to some devs. Django also has added some async features recently, and those are optional. Also, while FastAPI is great for APIs because it can auto-generate your API docs for you, it sounds like you are not going to have a public API so this may not be needed in your project. And Django has plugins like Django Rest Framework to help create nice REST API endpoints.

I want to point that, you can still have a fullstack app with next.js with T3 Stack (Next.js + tRPC + TypeScript + Prisma) so your api/server is collocated with your front-end. You can prototype quickly and pivot after to all first if your app grow

I think this is a good choice, so many design elements are considered for you such that even if you're not a great designer, as long as you're focused on layout and functionality it's relatively trival to go in later and apply themes and custom widgets. I'm using flutter for the same reasons as you it sounds like and for what it's worth people have been extremely pleased with the tools I've built for them even though I didn't really consider design. Knowing I don't have to worry about making things pretty for them to be attractive to end users is a huge boon for me and I hope it can be for you as well.

RE Flutter Web, I'm sure it will improve with time, I've only ever really seen it slow when it's first starting up. but once the app is "loaded" into the web server so to speak, it's generally been pretty performant assuming I'm doing things like caching appropriately.

I got a task at my previous company to compare between Flutter and RN and Xamarin. And Flutter was the better choice among the others, that was before version 3, and now after version 3 it becomes better, so I would recommend Flutter for you.