Hire mobile app developers who own your app from platform choice to crash report

For most apps, yes. When the app is mostly screens, data and API calls, one developer builds and releases both, either as two native apps or from one shared codebase. A platform specialist joins when one side carries deep native work, such as a watch app, CarPlay or Android Auto, or heavy camera processing. We say which applies before the profiles go out.

A few, matching the phones most of your users hold. The rest come from a cloud device lab. The developer builds the device list from your analytics: the oldest OS versions still in real use, the most common screen sizes and the Android manufacturers your users favour. A bug reported on a phone outside the list is reproduced on that model before it is fixed.

It depends on your users, not on a rule of thumb. The developer reads your analytics for the share of active users on each iOS and Android version, and Apple's and Google's SDKs raise their own minimums over time. Dropping a version leaves those phones on the last build that supported them, so the decision is yours, made on numbers.

You agree the rule; the developer applies it. A usual rule widens the rollout only while crash-free users hold against the previous version, and stops it at the first new crash group in a paying flow. On Google Play the developer sets each percentage and can halt it. Apple's phased release widens by itself over seven days, can be paused for up to 30 days in total, and covers automatic updates only.

On a fixed schedule, with the release branch cut on a set day each cycle. A feature that misses the cut waits for the next release instead of holding up the others, and store review time is planned in. The pace is usually set by how quickly a build can be tested, not by the stores. Hotfixes go out between releases, through the same pipeline.

Access, mostly: the repository, a role in App Store Connect and Google Play Console, the crash and analytics tools, and wherever the signing keys live. Before changing anything, the developer builds both apps from a clean machine. If that fails, fixing it comes first, because a release only one laptop can produce is the largest risk an app carries.

Usually, though we will not promise a figure before anyone has read your crash data. Crashes tend to cluster in a few groups, often one SDK version, one old OS or one screen, and ranking them by users affected shows where to start. At Piiics, our engineers reached 99% crash-free users on both platforms. The developer then tracks the rate per version, so it does not slide back.

Ask for a release they ran themselves: open a crash report from their last app and explain the fix, or walk through a store rejection and what they changed. Then ask what they would check before widening a rollout. People who have owned releases answer from memory; people who have only built features tend to guess.

Yes. Many clients start with one senior engineer to cover a specific capability or capacity gap, then add specialists only when the roadmap requires them.

Yes. Adding an engineer follows the same route as the first, and you interview them. Reducing the team follows the notice period agreed in the contract, and the work is handed over in your repository before anyone leaves.

Yes. You manage priorities and day-to-day work directly, in your own channels and delivery process.

Yes. You interview every candidate using your own process and make the final decision about who joins the team.

Our engineers are ImproveIT employees and long-term contractors working through our teams in Poland and Ukraine. We are not a freelance marketplace and do not resell developers from other vendors.

Replacement terms are defined in the contract upfront, so it does not become a negotiation.

You do. IP assignment is included in the contract, and we can sign an NDA before discussing the project.

We sign an NDA before discussing the project, and confidentiality and IP assignment are part of the contract. Engineers work in your repositories, cloud accounts and tools with the access your team grants, so you can narrow or revoke it at any time.

Yes. Our engineers work with teams across Europe and the US. We agree the required working-hour overlap before matching candidates.

Our developers work in English with international product and engineering teams every day. English level is included in the candidate information you receive before the interview.

Rates depend on the role, seniority, experience, and engagement model. You receive the rate, availability, and candidate profile in writing before making any commitment.

Both are agreed before the engagement starts and included in the proposal and contract. We are flexible in that and usually agree on the terms suitable for a client.