Software Engineer

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process. If you're interested sign up to Dex to apply. Dex is an AI recruiter agent that helps you run your job search. Tell Dex your stack, seniority, and what you want to build. We will manage your applications and surface other opportunities that are a fit. The role This company is building the intelligence layer for payment fraud, a real-time investigation engine that gathers evidence across multiple sources, risk-scores it, and surfaces the right intervention before money moves. The core technical challenge is orchestrating multi-source evidence, synthesising unstructured data with AI agents, and returning confident verdicts fast enough that legitimate payments aren't delayed. They are backed by leading investors, working with major UK banks in production, and aiming to overlay this protocol across billions of transactions globally. This role sits at the heart of that system. You will own the APIs and UIs banks use to integrate the investigation engine, the orchestration layer coordinating evidence across heterogeneous data sources, and the AI agents driving live investigation flows. This is not a feature factory; you will own systems end-to-end, from design to shipping and iteration, in a small, high-calibre team. The work Design and build the external APIs and UIs that integrate a real-time investigation engine into major bank payment flows.Develop and scale the core orchestration layer, coordinating evidence gathering from heterogeneous, often unstructured, data sources.Engineer AI agents to synthesise complex data, generate confident risk verdicts, and trigger interventions at sub-second speeds.Build and maintain fault-tolerant distributed systems, ensuring 24/7/365 uptime for critical financial infrastructure.Make consequential architectural decisions, balancing performance, reliability, and data privacy in a high-stakes production environment. What You Bring 5+ years of software engineering experience, with a track record of owning outcomes in an early-stage environment.Proven experience building and operating fault-tolerant distributed systems with stringent uptime requirements.Strong product ownership instinct: you identify the smallest useful thing to ship and drive solutions without perfect specs.Proficiency in Python and TypeScript/React. Experience with GCP, Terraform, or SQL is a plus.Comfortable making significant architectural decisions in a fast-moving team, clearly articulating trade-offs. Why apply through Dex This is a rare, high-impact role at a company solving a critical problem in financial infrastructure. Dex helps you cut through the noise: get a direct introduction, skip the cold application, and receive a full brief before you interview. We match you to this role and others like it, ensuring you only consider opportunities that genuinely move your career forward. If you're interested, sign up to Dex to apply - https://jobs.meetdex.ai/jobs/0faee444-1400-471d-a9f9-f78ca7ea090d As part of the recruitment process at Dex, we process your personal data in accordance with our Privacy Notice for Job Applicants. This notice explains how and why your data is collected and used, and how you can contact us if you have any concerns.