Location: Remote
Your expertise:
Senior-level Android engineering experience with a strong command of Kotlin and Jetpack Compose
Solid understanding of modern app architecture, including MVVM / MVI
Experience with dependency injection using Hilt
Strong knowledge of Coroutines and Flow
Proven ability to own features end-to-end and successfully ship products to production
High level of autonomy and sound technical decision-making without close supervision
Will definitely be a plus:
Experience with real-time communication technologies: WebRTC, VoIP, voice / video
Experience with secure / encrypted messaging
Experience with WebSockets or push notifications
Familiarity with multi-device sync
Contributions to performance optimization, testing, or CI / CD processes
Startup or early-stage product experience
What’s in it for you?
Vacation / sick leave policy: 30 days of paid time off and 5 sick days per year; no separate public holidays
Equipment policy: Equipment is provided by the company
Compensation review policy: On demand
Performance review / salary review: Performance review every quarter
Stock options — equity ownership of a percentage of the company
You will be involved into:
Building and owning features of the Thunderbolt Android app end-to-end — from design and implementation to release and maintenance
Taking responsibility for code quality, architecture, and the overall health of the Android codebase
Proactively proposing and driving improvements instead of waiting for direction
Collaborating closely with Backend, Web, and UX teams to ship a cohesive product
About the company and project:
ZONE3000 is a 2400+ people family that forms a new cultural code in the software development business. For 25 years we have been focusing on the highest quality of projects and empowering people to think big and make a difference. We are looking for talents who want to create and improve technological solutions for tomorrow and make things as best possible.
On behalf of our client Thunderbolt LLC (thunderbolt.com) — a next-generation business communication platform that combines secure, domain-based messaging with AI-powered automation to help businesses communicate with their clients smarter and safer, ZONE3000 is looking for Software Engineer (Android) to join as a contractor and contribute to the development of the mobile product.
Thunderbolt LLC is a US-headquartered startup built around Thunderbolt — a secure business communication platform. The product enables voice and video calls and chat messaging using a company’s domain name instead of a phone number or email, with end-to-end encryption, domain-ownership verification, and DNSSEC protection.
Thunderbolt combines secure, domain-based communication with AI-powered automation, giving businesses a unified platform to manage client conversations across their website and beyond.
The team is organized across four core functions — Mobile, Web, Backend, and UX — and collaborates closely to evolve the product from a domain-based communication tool into a full AI-powered business communication platform.
As a Senior Software Engineer (Android) at Thunderbolt, you will take full ownership of the Android application end-to-end — from design and implementation through release and maintenance — while collaborating closely with Backend, Web, and UX teams to deliver a secure, scalable, and high-quality real-time communication product.
