I take on a small number of projects at a time, so the work gets the same attention as the apps I publish myself. Everything below is something I use in production, not a capability list.
Flutter for both platforms, Kotlin when Android needs to go deeper.
The same stack behind the apps in the catalog on this site. Flutter covers Android and iOS from one codebase; native Kotlin handles the work that touches the platform directly — widgets, live wallpapers, background services.
Fast, accessible front-ends that survive a Lighthouse audit.
Marketing sites, dashboards, and companion web apps. Server-rendered where it helps the load, static where it can be, and responsive down to a 360px phone.
APIs the mobile app can actually depend on.
REST and GraphQL services, auth, payments, push, and the database design underneath. Built so the client stays thin and the business logic sits somewhere you can test it.
AWS or Azure, provisioned so you can hand it to someone else.
Deployment pipelines, container hosting, storage, and monitoring on either platform. Infrastructure written down as configuration rather than assembled by hand in a console.
A paragraph and a rough deadline is enough to start. You will get an honest read on scope and timing, including when the answer is that I am not the right fit.