Location: Remote
Your expertise:
Senior-level iOS engineering experience with a strong command of Swift and SwiftUI
Solid understanding of modern app architecture, including MVVM
Experience with Swift Concurrency, including async / await, and Combine
Proven ability to own features end-to-end and successfully ship applications to the App Store
High level of autonomy and sound technical decision-making without close supervision
Upper-Intermediate English level or higher, with confident written and spoken communication for a fully distributed, English-only team
Will definitely be a plus:
Experience with real-time communication: WebRTC, VoIP, voice / video, CallKit / PushKit
Experience with secure / encrypted messaging
Experience with WebSockets or push notifications
Familiarity with multi-device sync
Contributions to performance, testing, or CI / CD
Startup or early-stage product experience
What’s in it for you?
Opportunity to deal with top-notch technologies and approaches in a world-leader product company with millions of customers
Opportunity to make a difference for online privacy, freedom of speech, and net neutrality
Decent market rate compensation depending on experience and skills
Developed corporate culture: no micromanagement, culture based on principles of truth, trust, and transparency
“You build it, you own it” mentality in most contexts
Support of personal and professional development
coverage of costs of external trainings, conferences, professional literature
support of experienced colleagues
in-house events and trainings
regular knowledge sharing in teams
English classes and speaking clubs
Life-balance support
truly flexible schedule, no time-tracking at all
25 working days of vacation
5 days of paid sick leave per month (if necessary) without providing a medical certificate
generous maternity / paternity leave program
Professionally strong environment, friendly and open atmosphere, ability to influence the product development and recognition for it
You will be involved into:
Building and owning features of the Thunderbolt iOS app end-to-end — from design and implementation to release and maintenance
Taking responsibility for code quality, architecture, and the overall health of the iOS 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 (https://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 a Software Engineer (iOS) 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 Software Engineer (iOS),
