Senior Backend Engineer
First seen by Alion on Aug 26, 2026.
Job Description :
Were looking for a Senior Backend Engineer to join our team. Youll design and build the microservices, APIs, and integrations that sit at the heart of our security platform working closely with security analysts, product managers, and fellow engineers to ship reliable, observable, high-quality software. Youll also help shape how our team uses AI coding tools to ship faster without compromising on quality, security, or maintainability.
Responsibilities :
- Design, build, and operate production-grade Python microservices using FastAPI (and Django where appropriate), applying clean architecture, domain-driven design, and async patterns to deliver resilient APIs.
- Build event-driven workflows , designing for idempotency, retries, dead-letter handling, and back-pressure across services.
- Own services end-toend on AWS (EKS, RDS/PostgreSQL, messaging, IAM, S3 for example), provisioned with Terraform and deployed via GitHub Actions and FluxCD (GitOps).
- Collaborate with frontend engineers working in an Angular microfrontends architecture - designing API contracts that are clean, versioned, and a pleasure to consume.
- Write and maintain test suites - unit, integration, contract, and endtoend with Playwright - and treat tests, observability, and CI signal as firstclass deliverables, not afterthoughts.
- Instrument services for observability (structured logs, metrics, traces) so we can detect, diagnose, and resolve issues quickly in production.
- Participate in architecture discussions, code reviews, threat modelling - raising the bar for the whole team.
- Work within an Agile delivery model - contributing to refinement, estimation, retrospectives, and pragmatic technical decisions.
Essential Skills :
- 5+ years of backend engineering experience with Python as a primary language, shipping and operating services in production.
- Strong production experience with FastAPI (or Django) - async patterns, dependency injection, Pydantic, API design, versioning, and authn/authz.
- Solid background in distributed / microservice architectures - service boundaries, idempotency, retries, eventual consistency, and messagedriven patterns.
- Strong PostgreSQL / RDS skills: schema design, indexing, query optimisation, and safe migrations under load.
- Handson experience with AWS and containerised workloads on EKS / Kubernetes.
- Experience with GitHub Actions and a GitOps deployment model (we use FluxCD).
- Strong fundamentals across testing, observability, application security, and documentation.
- Excellent written communication - design docs, RFCs, PR descriptions, and incident writeups.
Optional Skills :
- Background in cybersecurity, MSSP, SOC tooling, or SaaS security products.
- Familiarity with Angular and microfrontends enough to collaborate effectively on contracts and integration with frontend engineers.
- Experience designing agentic workflows for triage, enrichment, or analyst decision support in a security context.
- Have authored AGENTS.md / CLAUDE.md, custom agent skills, or MCP servers to make AI tooling reliable across a team.
- Daytoday use of AI coding assistants (Claude Code, Copilot, Cursor, or equivalent) on production code with a clear point of view on how to use them well and where to draw the line.
- Familiarity with securitydomain integrations SIEM, SOAR, EDR, or ServiceNow SIR.
- General understanding of data warehousing, ETL pipelines, automation workflows (Apache Airflow, n8n, etc.)
- Comfortable writing Terraform for real infrastructure (modules, state, drift, code review of IaC).
- AWS certifications (Solutions Architect Associate or Professional).
Education Requirements & Experience :
- Education: MS or bachelor's degree in engineering, computer science, or a related
- Candidates should have at least 5+ years of experience
Skills
Python, FastAPI, API, Azure, PostgreSQL, Django, Microservices Architecture, AWS, Cloud, Backend Architecture