Senior Software Engineer (Backend) Behavioral Security Products

London - UK

Monthly Salary: Not Disclosed

Posted on: 20 hours ago

Vacancies: 1 Vacancy

Job Summary

At Abnormal AI we protect our customers against nefarious adversaries who are constantly evolving their techniques and tactics to outwit and undermine the traditional approaches to Security.

Abnormal is recognized as a top cybersecurity startup (Leader in the 2025 Gartner Magic Quadrant for Email Security Platforms) securing a Series D funding of $250 million at a $5.1 billion valuation in August 2024.

About The Team

The team is responsible for the ownership development and operation of the infrastructure and ML models customer facing APIs and internal tools that drive Abnormals Account Takeover (ATO) protection product. This product is crucial for detecting malicious activity and safeguarding customers from account theft.

About The Role

We are looking for a Senior Software Engineer to take ownership of complex feature delivery and technical design for our ATO platform. This pivotal role involves evolving the platform to scale with expanding product requirements. The position requires a blend of hands-on backend systems development production ownership stakeholder management and team mentorship. The core goal is to enhance system reliability reduce latency and significantly accelerate feature release cycles.

What Youll Do

Technical Delivery & Excellence

Design build and iterate on scalable backend and ML systems APIs frameworks and internal tools
Own end-to-end delivery of complex features that directly impact customer experience.
Ensure stability reliability and operational excellence of critical systems.
Write clean testable and resilient code with attention to edge cases and performance.
Write and review technical design documents and influence adoption across the team.
Participate in code and design reviews and contribute to on-call rotations.

Leadership & Collaboration

Collaborate with product managers designers and engineers to align on specifications and priorities.
Break down complex projects into clear executable steps and drive them to completion.
Actively contribute to roadmap discussions and propose long-term technical plans.
Communicate effectively in an async-first environment providing clarity on updates challenges and solutions.
Mentor peers share knowledge and influence engineering practices across the team.

What Were Looking For

Ownership & Growth: A senior engineer mindsetable to independently lead complex projects and grow into a technical leader within the team.
Attention to Detail: Deep focus on code quality reliability monitoring and performance.
System Thinker: Ability to anticipate long-term scaling needs and design resilient architectures.
Strong Collaborator: Comfortable influencing cross-team goals mentoring peers and working in a distributed environment.
GenAI Affinity: Proactive in leveraging modern developer productivity tools including GenAI assistants to accelerate delivery.

Must-Have Skills

7 years of industry experience with proven expertise as a Senior Software Engineer.
Strong backend proficiency in Python with experience designing and scaling production systems.
Proven experience with large scale system design building resilient scalable and fault-tolerant applications.
Strong knowledge of relational databases and modern data storage technologies .
Familiarity with service-to-service communication (gRPC Kafka) and caching (Redis).
Experience with AWS cloud services (S3 RDS) and deployment practices.
Familiarity with containerization and orchestration (Docker Kubernetes Helm).
Strong understanding of service health monitoring and incident response practices.
Experience writing technical design documents and influencing adoption across teams.

#LI-RT1

Required Experience:

Senior IC

At Abnormal AI we protect our customers against nefarious adversaries who are constantly evolving their techniques and tactics to outwit and undermine the traditional approaches to Security.Abnormal is recognized as a top cybersecurity startup (Leader in the 2025 Gartner Magic Quadrant for Email Sec...