Software Engineer - Privacy-First Communications Infrastructure

We're looking for a Senior Software Engineer to join a small, high-calibre team with strong open-source backgrounds and a culture of real technical ownership. The stack is centred around Rust, with PostgreSQL, Redis, and NATS across the data layer. The product sits at the intersection of backend infrastructure and cryptographic systems, meaning the challenges go well beyond standard application development. You'll work on secure data flow, performance at scale, and designing systems that remain reliable under strict privacy constraints.

• Demonstrated excellence outside of work
• Open-source contributions, side projects, or other evidence of self-directed engineering ambition
• 3+ years building and operating high-throughput backend systems at scale, with ownership of technical directionHands-on production experience with PostgreSQL, Redis, and NATS - schema design, query tuning, and failure recovery
• Strong systems programming fundamentals: concurrency, memory management, networking, and performance profiling (Rust, Go, C++, or equivalent)
• Experience designing client-facing SDKs or APIs with stable contracts, versioning, and cross-platform consistency

This company is building a next-generation, privacy-first communication platform designed for high-stakes environments where security isn't optional. Their core product is a messenger application with true end-to-end encryption at the protocol level - not bolted on, but foundational to everything they ship. They operate on a simple principle: everything not end-to-end encrypted or self-hosted ultimately surrenders data to third-party providers. They're not building another messaging tool. They're creating secure infrastructure that institutions can actually rely on - across finance, government, and enterprise use cases where data integrity and privacy are critical.