Senior Software Engineer - Behavioral Security Products

Overview

Senior Software Engineer to take ownership of complex feature delivery and technical design for Abnormal's Account Takeover (ATO) protection platform, covering backend systems, ML infrastructure, customer-facing APIs and internal tools.

What you'll do

• 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.
• 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 you'll need

• 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.

Nice to have

• GenAI affinity: proactive in leveraging modern developer productivity tools, including GenAI assistants, to accelerate delivery.

Details

• Location: Remote - UK.
• Async-first, distributed working environment.
• Participation in on-call rotations.
• Pre-employment checks must be successfully completed before a final offer.