Staff/Principal Software Engineer - Backend

Dex; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Dex is recruiting for a backend architecture lead to set technical direction across inaccessible and constrained networks, with a Rust/Python stack. You will own core backend systems used by other engineers and drive solutions for intermittent connectivity and trusted boundaries in real-time environments.

This role requires cross-team collaboration and a strong taste for reliable, scalable systems. You will mentor peers, author RFCs, and push for architectural improvements that impact fleets in

Qualifications

• Own architecture and technical direction for backend systems used by other engineers.
• Deep authority in edge computing, latency, distributed systems, or platform engineering.
• Experience building backends in Rust, Java, Go, or C++, with real reliability trade-offs.
• Mentor, review RFCs, and prioritise unblocking others over shipping one more thing.
• Comfortable with ethical considerations as an ongoing domain debate.

Responsibilities

• Own architecture and technical direction for backend systems that other engineers depend on.
• Define and implement solutions for intermittent connectivity and resource-constrained embedded compute.
• Drive technical decisions and RFCs for fleet coherence and trust boundaries in unsecured environments.
• Ensure graceful degradation and reliability in high-stress, real-time settings.
• Identify and address cross-team technical opportunities and challenges.

Skills

Architecture ownership

Edge computing

Distributed systems

Platform engineering

RFCs

Mentoring

Tools

Rust

Python

Job description

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process.

The role

This company builds AI software that transforms unstructured sensor data into real-time operational intelligence, powering semi-autonomous platforms that localise, navigate, and perceive the world in real time. Backed by leading investors, they've secured significant funding to tackle some of the most challenging real-world problems, with senior leadership bringing deep experience from top-tier AI and platform companies.

This is not a typical backend role. The constraints are genuinely unusual: intermittent connectivity, resource-constrained embedded compute, air-gapped fleets, low-trust networks where TLS is not an option. You won't just execute inside an existing design. You'll set the technical direction across these challenges. There's no playbook for these problems. How do you keep a fleet coherent when parts are unreachable for hours? Version and ship software over low-bandwidth radios? Define trust boundaries on an unsecured network? Ensure graceful degradation when lives depend on it? You'll make those calls, argue them through RFCs, and live with the consequences on platforms in active service. This means a licence to look beyond your own team, acting when you spot a missed opportunity. The stack is Rust and Python, but hiring is language-agnostic.

The work

• Own architecture and technical direction for backend systems that other engineers depend on.
• Define and implement solutions for intermittent connectivity, resource-constrained embedded compute, air-gapped fleets, and low-trust networks.
• Drive technical decisions and RFCs for fleet coherence, software versioning over low-bandwidth radios, and trust boundaries in unsecured environments.
• Ensure graceful degradation and reliability in high-stress, real-time operational settings.
• Actively identify and address cross-team technical opportunities and challenges.

What You Bring

• You operate across teams and business lines, having owned architecture and technical direction for critical systems.
• You bring deep authority in edge computing, latency, distributed systems at scale, or serious platform engineering, with proven systems to show for it.
• You've built backend systems in Rust, Java, Go, or C++, making hard reliability trade-offs in production, not just in design docs.
• You raise the engineering bar: you mentor, review, write RFCs that change minds, and prioritise unblocking others over shipping one more thing yourself.
• You are comfortable working in a domain where ethical considerations are an active, ongoing debate, not a settled question.