Staff Backend Engineer

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. What you’ll do Architect and Own: Design 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 Technical Strategy: Lead complex cross‑functional technical projects from conception to completion ensuring alignment with product strategy and client needs. Shape the Future: Partner with Product and Engineering leadership to build and refine the technical roadmap, identifying key technical challenges and proposing innovative solutions that drive our business forward. Drive Innovation: Champion a culture of innovation and continuous improvement. Transform the Trustpair engine by exploring and implementing new technologies with a strong focus on applying LLM‑based solutions to solve complex business problems. Mentor and Elevate: 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. Ensure Operational Excellence: Promote and implement best practices for observability, scalability and performance, ensuring our core systems are reliable and efficient. Whats in it for you High‑Impact in a High‑Growth Environment: Join a company with 50% business growth where tech is one of the core accelerators. You’ll be building solutions for a platform with rapidly increasing usage directly influencing our success. Shape Our Future (Scaleup Phase): We want your voice in making the critical architectural product and organizational decisions that will define our future. Modern Stack & AI‑Powered Engineering: Work with a clean Ruby on Rails stack state‑of‑the‑art DevOps and managed tech debt. We are aggressively adopting AI both in our product (LLMs) and to boost your own efficiency with tools like Cursor. Culture of Full‑Fledged Engineering Ownership: You are an engineer with a strong voice and full accountability. We empower you to drive initiatives from technical design to final impact. Accelerated Career Growth: Our rapid expansion creates constant and significant opportunities for career advancement, skill development and taking on new leadership responsibilities. Collaborative & International Team: Thrive in a diverse cross‑functional and international environment. Must Haves Mission‑Driven & Customer‑Focused: You are passionate about solving real‑world problems and are driven to connect technical solutions with customer value and business impact. Deep Technical Expertise: You have at least 8 years of experience with technologies in high‑throughput environments and at least 2‑3 years in Ruby on Rails. Proven Architect: Experience architecting, building and operating complex large‑scale systems, particularly those with asynchronous workflows and demanding workloads. Observability Expert: Hands‑on experience implementing and leveraging observability tools (e.g. Datadog, Prometheus, Grafana) to ensure system health and performance. DevOps & Infrastructure Acumen: Strong DevOps mindset and practical experience in scaling and tuning applications on container orchestration platforms like Kubernetes. Performance Master: Deep expertise in performance analysis and optimization, capable of debugging bottlenecks in application code, databases (e.g. PostgreSQL) and infrastructure. Collaborative Leader: 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. Continuous Learner: Maintain a strong technical watch on the evolving ecosystem and apply best practices from diverse communities to solve problems creatively. Bonus Points Direct experience 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. Recruitment Process First call with Aicha Talent Acquisition Manager (30 mins) Experience interview with Benoit CTO (1 h) Case study on site with our Engineering team Coffee fit with two members of our Engineering & Product teams (30 mins) Cofounders interview with Alex Cofounder & MD (45 mins) Equal Opportunity Statement Trustpair’s policy is to provide equal employment opportunity in all of our employment practices without regard to race, color, religion, sex, national origin, ancestry, marital status, protected veteran status, age, individuals with disabilities, sexual orientation or gender identity or expression or any other legally protected category. Applicants for all positions in Trustpair must be legally authorized to work in the country which they are applying for or be a citizen from Schengen / EU zone. Verification of employment eligibility will be required as a condition of hire. Required Experience Staff IC Key Skills Computer Science, Docker, Kubernetes, Python, VMware, C / C++, Go, System Architecture, gRPC, OS Kernels, Perl, Distributed Systems Employment Type Full‑Time Experience years Vacancy 1 #J-18808-Ljbffr