Senior Backend Architect for Core Platform

United States Digital Space LLC; Greater London; Remote; GBP 110,000 - 150,000; Full time

Job summary

United States Digital Space LLC, headquartered in London, seeks a Senior/Staff Software Engineer for Nova Core backend platforms. You will design, build, and operate core backend services enabling secure C2 operations across Nova Cloud deployments.

The role focuses on service architecture, APIs, data models, authn/authz, observability, and developer experience, supporting multiple Nova modules and product teams. Strong emphasis on reliability and security.

Qualifications

• 5+ years building and operating production backend systems and services.
• Strong experience in API design, backend architecture, and evolving contracts safely over time.
• Solid data modeling and persistence experience (SQL and/or NoSQL), including migrations and schema evolution.
• Demonstrated operational ownership: observability, on-call readiness, incident response, and production debugging.
• Security-first backend engineering experience, including authn/authz patterns and audit/event design.
• Strong testing discipline (unit/integration/contract testing) and ability to build reliable systems under real-world constraints.
• Clear communication and cross-team collaboration skills; comfortable aligning stakeholders on architecture decisions.

Responsibilities

• Own and ship critical Nova Core backend services (e.g., common APIs, configuration service, tenant/environment lifecycle, shared domain libraries).
• Design stable, backward-compatible API contracts (schemas, versioning, deprecation/migration playbooks) to protect dependent services and teams.
• Build and evolve data models and persistence layers, including schema evolution, migrations, correctness guarantees, and safe rollout strategies.
• Establish production-grade operability: structured logging, metrics, tracing, dashboards, and actionable alerts; write and maintain runbooks.
• Improve reliability over time by reducing incident frequency and driving down MTTD/MTTR through instrumentation and post-incident improvements.
• Implement secure-by-default backend patterns (least privilege, secret management, audit events, policy hooks) and make them reusable across teams.
• Contribute to and enforce consistent RBAC/permissions and authorization checks across services and APIs.
• Add security-focused tests and CI/CD gates informed by threat modeling to reduce regressions.
• Build and maintain shared backend libraries/SDKs with strong documentation and examples to accelerate adoption and reduce duplicated work.
• Improve developer experience: faster local workflows, environment parity (e.g., dockerized deps, seeded data), and rapid test feedback.
• Strengthen test harnesses (contract tests, integration tests, performance baselines) to catch cross-service breakages earlier.
• Diagnose and fix high-impact performance bottlenecks (latency hot paths, caching, concurrency, DB query efficiency) and introduce pragmatic performance budgets.
• Refactor brittle areas and pay down targeted technical debt to improve maintainability and reduce operational risk.
• Communicate trade-offs clearly and collaborate effectively with dependent engineering and product teams.

Skills

Backend design

Data modeling

Observability

Security-first

Testing discipline

Cross-team communication

Tools

SQL

NoSQL

Job description

United States Digital Space LLC, headquartered in London, seeks a Senior/Staff Software Engineer for Nova Core backend platforms. You will design, build, and operate core backend services enabling secure C2 operations across Nova Cloud deployments.

The role focuses on service architecture, APIs, data models, authn/authz, observability, and developer experience, supporting multiple Nova modules and product teams. Strong emphasis on reliability and security.