Archysoft

About Archysoft

Archysoft is a software development company with over 10 years of experience delivering solutions to clients across the United States and Western Europe.

We are looking for a Senior Android Developer to maintain and further develop a mature native Android application for managing Bluetooth-enabled devices. The product also includes encrypted chats, audio and video calls, media integrations, and a Wear OS companion application.

This is a hands-on maintenance and feature-development role within a large production codebase built primarily with Kotlin, Java, RxJava 3, XML, ViewBinding, and a custom BLE stack.

The core requirement for this position is practical commercial experience combining:

• Android BLE;
• RxJava/RxAndroid;
• the classic Android View system: XML, ViewBinding, and custom views.

The main application uses RxJava 3 rather than Coroutines/Flow as its primary reactive stack. Jetpack Compose is currently used only in the Wear OS application. This is an established legacy product, not a greenfield Compose project or a full application rewrite.

In this role, you will

• Maintain and further develop a mature native Android application;
• Investigate crashes and production issues using Firebase Crashlytics;
• Implement new features and support new Android versions and devices;
• Work with a custom BLE protocol stack across several generations of physical devices;
• Work with BLE scanning, GATT services and characteristics, and read/write/notify operations;
• Improve connection management, reconnect logic, connection stability, background operation, and foreground services;
• Support DFU/OTA firmware updates;
• Maintain WebRTC audio and video calls, real-time chats, encrypted data storage, and the Wear OS companion application;
• Support Media3/ExoPlayer and Spotify integrations;
• Manage releases through Google Play, Firebase App Distribution, and alternative distribution channels;
• Support different product flavors, regional builds, and white-label configurations;
• Update dependencies, improve legacy code, reduce technical debt, and introduce unit tests;
• Participate in code reviews and collaborate with development and QA teams.

Required experience and skills

• 5+ years of commercial native Android development experience;
• Strong Senior-level ownership and the ability to work independently with a large production codebase;
• Expert knowledge of Kotlin;
• Ability to read, understand, and modify production Java code;
• Strong hands-on commercial experience with RxJava, preferably RxJava 3, including RxAndroid;
• Strong practical knowledge of the classic Android View system: XML layouts, ViewBinding, and custom views;
• Practical commercial Android BLE experience;
• Experience with GATT services and characteristics, including read/write/notify operations;
• Experience with BLE connection management, reconnect logic, background restrictions, foreground services, and connection stability;
• Experience with Hilt or Dagger 2;
• Experience with Room and Android Navigation Component;
• Experience maintaining large multi-module Gradle projects;
• Understanding of build variants, product flavors, and complex build configurations;
• Experience with the Google Play release lifecycle;
• Experience maintaining and debugging production applications;
• Ability to investigate issues and make technical decisions without constant supervision;
• English level B2 or higher.

As a plus

• RxAndroidBle or similar BLE libraries;
• OTA/DFU experience, including Realtek/RealSil or similar solutions;
• WebRTC, audio/video calls, and audio-routing experience;
• Wear OS and Jetpack Compose experience;
• End-to-end encryption, Olm/Matrix, or SQLCipher;
• Media3, ExoPlayer, or MediaSession;
• GitLab CI and fastlane;
• Firebase App Distribution;
• Experience distributing Android applications outside Google Play;
• Experience supporting applications for the Chinese market.

Technology stack

Kotlin, Java, RxJava 3, RxAndroid, RxKotlin, XML, ViewBinding, custom views, MVVM, LiveData, Hilt/Dagger 2, Retrofit, OkHttp, Room, Navigation Component, SQLCipher, RxAndroidBle, WebRTC, Media3, ExoPlayer, Firebase, Gradle, GitLab CI, fastlane, Wear OS, and Jetpack Compose.

What we offer

• Fully remote, full-time cooperation;
• A long-term product with an established user base;
• Work with technically complex mobile functionality and physical Bluetooth devices;
• A professional development plan and regular feedback;
• Compensation for approved courses and certifications;
• 20 paid working days per year for vacation and sick leave;
• Salary reviews based on performance and professional growth.

Interview process

1. Introductory interview with a recruiter;
2. Technical interview;
3. Final interview with the client or project representative.

About Archysoft

Archysoft is a software development company with over 10 years of experience delivering solutions to clients across the United States and Western Europe.

We are looking for a Senior iOS Developer to maintain and further develop a mature native iOS application for managing Bluetooth-enabled devices. The product also includes encrypted chats, audio and video calls, media functionality, and a companion Apple Watch application.

The project has been actively developed since 2018 and includes a large Swift codebase, multiple application targets, regional builds, and integrations with physical devices.

In this role, you will:

• Maintain and further develop the native iOS application;
• Investigate production issues and crashes;
• Implement new features and support new iOS versions and devices;
• Work with Bluetooth Low Energy, custom device protocols, background connections, and OTA firmware updates;
• Maintain WebRTC calls, CallKit integration, encrypted chats, and secure local storage;
• Support the Apple Watch application and background audio functionality;
• Manage TestFlight and App Store releases;
• Maintain multiple application targets and regional configurations;
• Update dependencies and gradually improve legacy code;

• Participate in code reviews and collaborate with development and QA teams.

   

Required experience and skills

• 5+ years of commercial iOS development experience;
• Expert knowledge of Swift;
• Strong commercial experience with UIKit, Storyboards, XIB, Auto Layout, and custom views;
• Strong experience with RxSwift, RxCocoa, and reactive programming;
• Practical experience with CoreBluetooth and BLE, including GATT, background modes, and connection stability;
• Ability to read and modify Objective-C code;
• Experience with local databases, Keychain, and sensitive or encrypted data;
• Strong knowledge of Swift Package Manager;
• Experience maintaining large multi-target Xcode projects;
• Experience with fastlane, TestFlight, and App Store releases;
• Strong production debugging skills;
• Ability to work independently;

• English level B2 or higher.

   

As a plus

• Experience with RxBluetoothKit and OTA/DFU firmware updates;
• WebRTC and CallKit experience;
• Apple Watch or watchOS development experience;
• Experience with end-to-end encryption technologies such as Olm or Matrix;
• Experience with Realm and encrypted local storage;
• GitLab CI, fastlane Match, and self-hosted macOS runners;

• Experience supporting applications for the Chinese market.

   

Technology stack

Swift, Objective-C, UIKit, MVVM, RxSwift, RxCocoa, Moya, Alamofire, CoreBluetooth, RxBluetoothKit, Realm, WebRTC, CallKit, Firebase, SPM, GitLab CI, fastlane, watchOS.

What we offer

• Fully remote, full-time cooperation;
• A long-term product with an established user base;
• Work with complex native mobile functionality and physical devices;
• Professional development plan and regular feedback;
• Compensation for approved courses and certifications;
• 20 paid working days per year for vacation and sick leave;

• Salary reviews based on performance and professional growth.

   

Interview process

• Introductory interview with a recruiter;
• Technical interview;
• Final interview with the client or project representative.