Senior Backend 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 builds the AI workspace for some of the world's largest banks and regulated financial institutions. They handle sensitive financial data, where compliance with SOC 2, GDPR, and FCA isn't a checkbox, but a core engineering challenge. Backed by leading investors, they've seen rapid growth, following a record-breaking Series A round. You'll join a lean, senior backend team, reporting directly to the founders. This is a staff-track IC seat with visible influence, not a layer in a larger organisation. You'll architect the core platform, build data pipelines for large-scale financial datasets, and productionise ML models in a highly regulated environment. This role is for an engineer who wants to own critical systems end-to-end, not just contribute to a small component. The work Architect and scale backend services and APIs that power an enterprise AI workspace processing sensitive financial data.Design and build high-performance data pipelines for large-scale financial datasets, ensuring accuracy and low latency.Optimise PostgreSQL schemas and queries for high-throughput operations across distributed systems.Partner with ML engineers to productionise complex models, integrating them seamlessly into backend systems.Lead technical design reviews, mentor junior engineers, and shape the engineering culture as the platform scales. What You Bring 7+ years of backend engineering experience, with a proven track record of building and scaling production systems.Expert-level Python and modern web frameworks (FastAPI preferred), demonstrated by shipping production services, not just contributing.Deep expertise in PostgreSQL, including query optimisation, indexing, and performance tuning under real load.Experience running event-driven architectures with message brokers (e.g., Azure Service Bus, RabbitMQ, Kafka) and task queues (e.g., Celery) at non-trivial throughput.Strong security fundamentals (authn/authz, encryption, data handling) and ideally experience shipping inside regulated environments (SOC 2, GDPR, FCA). Why apply through Dex Senior roles at rapidly growing, well-funded AI companies are rare and highly competitive. Dex helps you cut through the noise: sign up once, get matched to this role and others like it, and skip the cold application process. We'll brief you properly before any interview, giving you an edge in a crowded market. If you're interested, sign up to Dex to apply - https://jobs.meetdex.ai/jobs/b084256b-08f5-401e-b55c-ee6f1bd1ce67 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.