Senior Backend Engineer, AI Security & Observability

Harmonic Security; Greater London; Hybrid; GBP 89,000 - 105,000; Full time

Benefits offered by this job

401K

Pension plan

Generous PTO

Flexible hybrid work

Job summary

Harmonic Security is seeking a Backend Engineer to design, build, and maintain scalable integrations between our core applications, identity providers and data security platforms. You will own backend components end-to-end in a security‑savvy, AI‑driven environment.

You’ll work in a fast‑moving team that values clear communication, reliability, and scalable architectures. Bring 3–5+ years of Java backend experience, RESTful API design, and a passion for secure, observable systems.

Qualifications

• 3–5+ years of professional software engineering in the Java ecosystem.
• Experience with event‑driven architectures and distributed systems.
• Proven experience designing and maintaining RESTful APIs, webhooks, and service‑to‑service integrations.

Responsibilities

• Own deliveries and features from start to finish.
• Design, build, and own backend services in a microservices‑based, event‑driven architecture.
• Implement core domain logic that drives key product workflows and system behavior.
• Ingest and process high‑volume usage and event data from customer‑facing endpoints.
• Build backend services that support operational, analytics, and reporting use cases.
• Model, persist, and manage domain data, enabling querying, filtering, and lifecycle management.
• Expose well‑designed APIs and webhooks consumed by customers, UIs, and external systems.
• Power customer‑facing UI experiences by providing backend APIs for visibility, analytics, and configuration.

Skills

Java backend

Event-driven

REST APIs

Cloud environments

Performance

Collaboration

Tools

Spring Boot

Maven/Gradle

Job description

Harmonic Security is seeking a Backend Engineer to design, build, and maintain scalable integrations between our core applications, identity providers and data security platforms. You will own backend components end-to-end in a security‑savvy, AI‑driven environment.

You’ll work in a fast‑moving team that values clear communication, reliability, and scalable architectures. Bring 3–5+ years of Java backend experience, RESTful API design, and a passion for secure, observable systems.