Staff Backend Engineer (Ruby) M/F/Mx

Trustpair

18h•Hybrid

About The Position

Trustpair stops vendor fraud before it happens. We're the automated vendor validation platform protecting 400+ enterprise companies worldwide. Since 2017, finance and procurement teams have used Trustpair to eliminate vendor fraud while reclaiming 90% of the time they once spent on manual checks. As vendor fraud grows more sophisticated, we stay ahead by combining deep expertise in financial crime with cutting-edge technology. Our core product focuses on secure, reliable vendor account validation to wipe out fraud and boost efficiency. Internally, teams across Trustpair use AI tools in their day-to-day work to automate repetitive tasks and unlock strategic insights that help us build and operate better. From day one, you’ll be encouraged and trained to integrate these tools into your workflow in a practical, hands-on way. With offices in New York, Paris, London, and Milan, we're a diverse team united by a bias for action. We ship fast, learn from experiments, and tackle problems that matter: protecting billions in payments for companies worldwide. If you want to see your work make an immediate impact in financial security, Trustpair is built for you. Learn more about how we use AI in our everyday work. About the role As a Staff Software Engineer on our Core Evaluation team, you will be a technical authority driving the evolution of our most critical asset: the fraud detection engine. This is a pivotal role where you'll not only architect for scale and resilience, but also spearhead the integration of LLM-based insights to rethink our evaluation process. You will be entrusted with our most complex and ambitious projects, shaping advanced solutions from ambiguous requirements. Working within a dedicated squad, you will collaborate closely with your Engineering Manager, Product Manager, and fellow engineers to turn a strategic vision into a technical reality that further strengthens Trustpair's position as a market leader.

Requirements

You are passionate about solving real-world problems and are driven to connect technical solutions with customer value and business impact.
You have 8 years experience with technologies in high-throughput environments, with at least 2-3 years in Ruby on Rails.
You have a proven track record of architecting, building, and operating complex, large-scale systems, particularly those with asynchronous workflows and demanding workloads.
You have hands-on experience implementing and leveraging observability tools (e.g., Datadog, Prometheus, Grafana) to ensure system health and performance.
You possess a strong DevOps mindset and practical experience in scaling and tuning applications on container orchestration platforms like Kubernetes.
You have deep expertise in performance analysis and optimization, capable of debugging bottlenecks in application code, databases (e.g., PostgreSQL), and infrastructure.
You have excellent communication and collaboration skills, with a history of working effectively in agile teams, partnering with product management, and influencing technical direction without direct authority.
You maintain a strong technical watch on the evolving ecosystem, knowing how to identify and apply best practices from different communities to solve problems creatively.

Nice To Haves

Direct experience in designing, building, and deploying applications powered by Large Language Models (LLMs).
Experience working in a high-growth B2B SaaS environment.
A data-driven approach to decision-making, from product analytics to application monitoring.

Responsibilities

Design, architect, and own the technical vision for large-scale, distributed systems at the heart of our platform, with a focus on our complex evaluation workflows.
Lead complex, cross-functional technical projects from conception to completion, ensuring alignment with product strategy and client needs.
Partner with Product and Engineering leadership to build and refine the technical roadmap. You will identify key technical challenges and propose innovative solutions that drive our business forward.
Champion a culture of innovation and continuous improvement. You will be directly involved in transforming the Trustpair engine by exploring and implementing new technologies, with a strong focus on applying LLM-based solutions to solve complex business problems.
Act as a technical mentor and force multiplier for engineers within your squad and across the organization, promoting best practices in software architecture, design, and strategic thinking. Help the engineering manager drive the cultural shift to strengthen the customer focus.
Promote and implement best practices for observability, scalability, and performance, ensuring our core systems are reliable and efficient.