ppbHello! /bWould you love to improve the way companies take care of their people, their most valuable asset? We are looking for a bStaff Software Engineer /b to join our bDX and Performance team /b at Factorial, with a strong focus on bperformance, reliability, observability, load testing, and AI-assisted engineering workflows /b. /p h3DX and Performance Team /h3 pThe team’s primary goal is to increase Factorial’s quality, performance, and scalability by continuously improving the way we build our product. We focus on strengthening our tools, maintaining foundational elements, and promoting best practices in close collaboration with the rest of the engineering organization. /p pOur mission is to equip product builders with robust, AI-enabled tools and practices to deliver with quality, confidence, and efficiency. We work across teams to improve software patterns, remove obstacles, complete unfinished migrations, reduce tech debt, and raise the overall engineering bar across the company. /p pWithin this context, performance and reliability are an increasingly important area of focus. As Factorial continues to scale, we want to strengthen how we define service health, measure system behavior, standardize observability, validate systems under load, and apply modern AI workflows to help engineers interpret signals and act faster. /p h3The role /h3 pAs a bStaff Engineer /b at Factorial, you’ll be part of a team of b200+ Engineers /b. We look for people who are curious, proactive, technically strong, and effective communicators. People who enjoy solving complex technical problems, raising standards across teams, and building systems that help the whole organization perform at a higher level. /p pIn this role, you will help shape how Factorial defines, measures, and improves bperformance and service health /b across the engineering organization. You will work closely with bproduct teams /b and binfrastructure teams /b to improve observability, load validation, performance visibility, and the engineering practices around these topics. /p pbYou will partner with senior engineering leaders across product, infrastructure, and DX to raise the company-wide standard for performance and reliability. /b This is a cross‑cutting staff role with broad impact. You will contribute through hands‑on technical work, technical leadership, and by helping teams adopt stronger practices around bSLOs, observability, performance optimization, and AI‑assisted analysis workflows /b. /p pFactorial serves b15,000+ active customers /b and b1M+ active users /b across business‑critical workflows. Our current environment includes:



/p ul lia large Ruby on Rails backend with GraphQL APIs /li liTypeScript frontend applications /li licomplex CI/CD workflows /li liMySQL with replicas for OLTP workloads /li liClickHouse for analytical workloads /li liKafka for event‑driven and asynchronous processing /li lia multi‑region cloud architecture /li limeaningful TPS, IOPS, concurrency, and sustained operational load /li /ul pDon’t let unfamiliarity with every part of this stack hold you back. If you have worked in complex systems, know how to reason about performance and reliability at scale, and are excited to help teams build better software with better signals, we want to talk to you. /p h3What You Will Work On /h3 ul liDefining and evolving SLIs and SLOs for critical product journeys /li liImproving and standardizing observability, dashboards, and service health visibility across teams /li liInvestigating bottlenecks and regressions across application, database, asynchronous, and system layers /li liDriving improvements in latency, throughput, scalability, and reliability /li liBuilding more structured load testing workflows for critical paths /li liHelping teams validate system behavior under realistic traffic, concurrency, and tenant‑scale conditions /li liAnalyzing capacity, saturation, and behavior under peak load and growth scenarios /li liDefining practices and tooling to help prevent performance regressions before production /li liWorking closely with product and infrastructure teams to align on performance priorities and system behavior under load /li liDesigning AI‑assisted workflows to support metric and alert interpretation, anomaly analysis, incident investigation, performance insights generation and more. /li /ul h3We are looking for profiles that have /h3 ul liStrong hands‑on experience improving performance, scalability, and reliability in complex software systems /li liExperience defining or operating SLIs, SLOs, and service health frameworks /li liStrong knowledge of observability practices and tools such as Datadog /li liExperience investigating production bottlenecks across application, database, and distributed system layers /li liExperience building or improving load testing, benchmarking, or performance validation workflows /li liExperience diagnosing tail latency, throughput issues, and performance variability in production /li liBroad experience working with cloud‑based production systems /li liStrong communication skills, including technical writing and cross‑team alignment /li liA proactive mindset and strong ownership mentality /li /ul h3Ideally, you also bring /h3 ul liSignificant experience building and operating production systems at scale /li liExperience working in large-scale environments with meaningful traffic and operational complexity /li liExperience with Ruby on Rails, MySQL, Kafka,



GraphQL, ClickHouse, or equivalent technologies /li liPrevious experience in Performance Engineering or Reliability Engineering /li liInterest in modern AI tools and practical use of agentic workflows in engineering /li /ul h3How We Work (Barcelona) /h3 pAt Factorial, we believe the best products are built when people come together, in person, to collaborate, challenge ideas, and move fast. That’s why our Engineering teams follow an office‑first, versátil approach. /p pWe work on‑site several days a week, using that time to connect, align, and innovate as a team. At the same time, we support remote work when it makes sense for focus, flexibility, or personal needs. /p pThis balance helps us stay agile, creative, and closely connected, while giving everyone the space to do their best work. /p h3About Us /h3 pAt Factorial, we’re building the leading business management software for companies of all sizes. Our platform centralizes key workflows across HR, finance, and operations, freeing teams from manual processes so they can focus on what really matters: leading, growing, and taking care of their people. With over 1,200 employees across 7 markets, we serve 700,000+ users and are one of Europe’s fastest‑growing SaaS companies, backed by top‑tier investors and proudly headquartered in Barcelona. We believe in bold goals, radical ownership, and inclusive collaboration. If you're excited to shape the future of business management technology, we’d love to meet you. /p h3Our Values /h3 ul liWe own it: We take responsibility for every project. We make decisions, not excuses. /li liWe learn and teach: We're dedicated to learning something new every day and, above all, share it. /li liWe partner: Every decision is a team decision. We trust each other. /li liWe grow fast: We act fast. We think that the worst mistake is not learning from them. /li liWe believe in diverse talent: We welcome applicants from all backgrounds and strongly encourage people of diverse experiences and identities to apply. /li liWe believe in inclusion: We are committed to equal opportunities and actively promote workplace inclusion of people with disabilities. If you would like to learn more about our inclusive recruitment processes, you are welcome to indicate so optionally and we will share additional information with you. /li /ul pWanna learn more about us? Check our website! /p h3Perks of being part of our team /h3 pWe care about people and we also offer a lot of benefits for employees: /p ul liHigh growth, multicultural and friendly environment /li liAlan as private health insurance /li liHealthy life with Wellhub (Gyms, pools, outdoor classes) /li liSave expenses with Cobee /li liLanguage classes /li liBreakfast in the office and organic fruit /li liNora discounts /li liFree caffeine and theine /li liPet Friendly /li /ul /p #J-18808-Ljbffr

📌 Staff Engineer — Performance, Reliability & AI Automation (Oleiros)
🏢 Factorial
📍 Oleiros