Senior ML Engineer, Doc Fraud

Senior ML Engineer - Document Extraction Entrust (Identity Verification) Locations: - London (Hybrid, 3 days onsite) - Portugal (Hybrid or Remote) Department: Engineering Reports To: Engineering Manager Job Type: Full-Time The role We're looking for a Senior Software Engineer to join our Document Fraud team, where you'll build products that delight customers across all our product offerings including: financial services, driving verification, proof of address, and much more. Our team builds the fraud detection capabilities that power identity, processing government identity documents to enable secure document verification, fraud prevention, and seamless customer onboarding experiences. As a Senior Software Engineer on the Document Extraction team, you'll focus on delivering high-accuracy extraction with global document coverage. You'll contribute to our Document Verification offering, helping customers create smooth and secure onboarding experiences. To achieve this, you'll leverage cutting-edge technology including VLM/LLMs and traditional ML approaches in production systems at scale, tackling challenges from designing training and evaluation pipelines, optimising inference for real-time extraction, and integrating as part of our product offering. The job is done when we have happy customers reaping the benefits of what modern technology allows us to do. What You'll Do * Work closely with Applied Science, Product, Design, Data Science, and Operations to deliver highly accurate and performant document classification and extraction solutions across thousands of documents globally. * Lead the technical design of complex features and systems, taking ownership from RFC through implementation to production deployment. You'll produce clean, well-reasoned designs that leverage your experience to avoid pitfalls and age well over time. * Build and optimize production ML systems that matter: develop repeatable pipelines for training, evaluating, and deploying LLM models; implement GPU optimizations for inference; design advanced labeling workflows to improve model accuracy; and engineer robust solutions that deliver measurable customer value through faster processing and more accurate extraction. * Champion performance, scalability, and reliability by deeply understanding how our systems operate in production. You'll identify and tackle technical debt proactively, scope and stage releases effectively to ensure smooth deployments, and build metrics into features to measure success empirically. * Drive technical excellence across the team by leading RFCs, reviewing critical code, holding peers accountable for quality (code review, testing, documentation), and making well-reasoned tradeoffs between competing priorities. You'll work with Product to prioritize features and ensure the team delivers on its commitments. * Mentor and enable other engineers through pair programming, technical guidance, and collaborative problem-solving. You'll help team members deliver quality code, navigate complex challenges, and grow their skills. * Coordinate solutions to cross-cutting technical problems, working seamlessly across team and organizational boundaries. You'll overcome roadblocks respectfully and constructively, ensuring dependencies are tracked and issues have clear owners. * Contribute to a culture of continuous improvement, psychological safety, and collaboration through active participation in our squad-based organization, retrospectives, written documentation (RFCs, DACIs), and cross-functional partnerships. What We're Looking For * Strong production engineering experience: You've built, deployed, and operated complex systems in production. You understand observability, reliability, performance optimization, and the operational realities of running services at scale. * Hands-on LLM/ML systems experience: You've worked with LLMs in production—whether fine-tuning models, building inference pipelines, optimizing for latency/cost, or evaluating model performance. You're comfortable with frameworks like TensorFlow, PyTorch, or Triton, and you understand the engineering challenges of productionizing ML. * Technical depth and breadth: You're T-shaped—deep expertise in at least one area (e.g., ML infrastructure, backend systems, performance optimization) with broad understanding across software engineering. You're the go-to expert in your domain and can quickly come up with effective solutions. * End-to-end ownership: You take complex projects from idea through design, implementation, and production with minimal oversight. You launch features smoothly, anticipate risks, and feel responsible for outcomes beyond your immediate scope. * Tech stack: Our services are primarily Python-based, as well as Ruby and Typescript, everything running on AWS with Kubernetes. You're comfortable building production services in Python and understand cloud infrastructure. * Strong judgment and initiative: You make sound technical decisions in ambiguous situations, knowing when to be creative vs. pragmatic. You have a track record of taking initiative across multiple areas and coordinating solutions that cut across teams. * Mentorship and collaboration: You enable others to do their best work. You're comfortable guiding junior engineers, providing constructive code reviews, and adapting your communication style to your audience. You build productive relationships and promote team spirit. * Pragmatic problem-solving: You identify technical debt and tackle it strategically. You seek empirical evidence to validate ideas. You balance short-term needs with long-term architecture. You know when to make tradeoffs and can clearly articulate scalability and reliability constraints.