Rust Engineer

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Location: London (Onsite – Strong onsite presence required in the initial months)

Contract: 3-Month B2B – High Extension Potential

Start Date: Flexible April/May

An exciting opportunity for a Senior Rust Engineer to join a high-impact project focused on developing a Payment SDK in Rust . This role is 90% Rust-focused , working closely with mobile engineers (iOS/Android) and a third-party agency specializing in the Crux framework .

You\’ll be part of a collaborative, onsite-first environment, building foundational SDKs that will streamline payments across the business. The initial contract is 3 months , but strong potential exists for extensions or a permanent conversion.

Key Responsibilities:

• Develop a Payment SDK in Rust , forming the foundation for future SDKs (Accounts, Calendar, etc.).
• Ensure clean, maintainable, and scalable SDKs for mobile integration.
• Work closely with Crux framework specialists and mobile engineers.
• Maintain pure business logic , avoiding unnecessary dependencies.
• Participate in a high-paced, problem-solving environment , iterating on architecture and design.

Requirements:

• Senior-level Rust experience (SDK/library development).
• Familiarity with iOS or Android development (doesn\’t need to be extensive).
• Open to working with Crux framework despite its mixed reception.
• Strong problem-solving skills, collaborative mindset, and curiosity .
• Able to work onsite in London (4 days per week initially).

Preferred Experience:

• Prior experience building payments SDKs or working on payment systems.
• Experience in unifying disparate systems into a single SDK or library.

Ideal profile

• 90% Rust role with some mobile experience or an understanding of Android and iOS ecosystems.

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