Staff Engineer — Performance, Reliability & AI Automation

Hello!

Would you love to improve the way companies take care of their people their most valuable asset

We are looking for a Staff Software Engineer to join our DX and Performance team at Factorial with a strong focus on performance reliability observability load testing and AI-assisted engineering workflows.

DX and Performance Team

The teams primary goal is to increase Factorials 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.

Our 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.

Within 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.

The role

As a Staff Engineer at Factorial youll be part of a team of 200 Engineers. 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.

In this role you will help shape how Factorial defines measures and improves performance and service health across the engineering organization. You will work closely with product teams and infrastructure teams to improve observability load validation performance visibility and the engineering practices around these topics.

You will partner with senior engineering leaders across product infrastructure and DX to raise the company-wide standard for performance and reliability.

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 SLOs observability performance optimization and AI-assisted analysis workflows.

Youll work in a multicultural English-speaking environment where your technical depth systems thinking and problem-solving skills will directly contribute to our mission of improving business management processes for companies worldwide.

Factorial serves 15000 active customers and 1M active users across business-critical workflows. Our current environment includes:

• a large Ruby on Rails backend with GraphQL APIs
• TypeScript frontend applications
• complex CI/CD workflows
• MySQL with replicas for OLTP workloads
• ClickHouse for analytical workloads
• Kafka for event-driven and asynchronous processing
• a multi-region cloud architecture
• meaningful TPS IOPS concurrency and sustained operational load

Dont 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.

What you will work on

• Defining and evolving SLIs and SLOs for critical product journeys
• Improving and standardizing observability dashboards and service health visibility across teams
• Investigating bottlenecks and regressions across application database asynchronous and system layers
• Driving improvements in latency throughput scalability and reliability
• Building more structured load testing workflows for critical paths
• Helping teams validate system behavior under realistic traffic concurrency and tenant-scale conditions
• Analyzing capacity saturation and behavior under peak load and growth scenarios
• Defining practices and tooling to help prevent performance regressions before production
• Working closely with product and infrastructure teams to align on performance priorities and system behavior under load
• Designing AI-assisted workflows to support metric and alert interpretation anomaly analysis incident investigation performance insights generation and more.

We are looking for profiles that have

• Strong hands-on experience improving performance scalability and reliability in complex software systems
• Experience defining or operating SLIs SLOs and service health frameworks
• Strong knowledge of observability practices and tools such as Datadog
• Experience investigating production bottlenecks across application database and distributed system layers
• Experience building or improving load testing benchmarking or performance validation workflows
• Experience diagnosing tail latency throughput issues and performance variability in production
• Broad experience working with cloud-based production systems
• Strong communication skills including technical writing and cross-team alignment
• A proactive mindset and strong ownership mentality

Ideally you also bring

• Significant experience building and operating production systems at scale
• Experience working in large-scale environments with meaningful traffic and operational complexity
• Experience with Ruby on Rails MySQL Kafka GraphQL ClickHouse or equivalent technologies
• Previous experience in Performance Engineering or Reliability Engineering
• Interest in modern AI tools and practical use of agentic workflows in engineering

How We Work (Barcelona)

At Factorial we believe the best products are built when people come together in person to collaborate challenge ideas and move fast. Thats why our Engineering teams follow an office-first flexible approach.

We 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.

This balance helps us stay agile creative and closely connected while giving everyone the space to do their best work.

About us

At Factorial were 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 over 1200 employees across 7 markets we serve 700000 users and are one of Europes fastest-growing SaaS companies backed by top-tier investors and proudly headquartered in believe in bold goals radical ownership and inclusive collaboration. If youre excited to shape the future of business management technology wed love to meet you.

Our Values

• We own it: We take responsibility for every project. We make decisions not excuses.
• We learn and teach: Were dedicated to learning something new every day and above all share it.
• We partner: Every decision is a team decision. We trust each other.
• We grow fast: We act fast. We think that the worst mistake is not learning from them.
• We believe in diverse talent: We welcome applicants from all backgrounds and strongly encourage people of diverse experiences and identities to apply.
• We 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.

Wanna learn more about us Check our website!

Perks of being part of our team

We care about people and we also offer a lot of benefits for employees:

• High growth multicultural and friendly environment
• Alan as private health insurance
• Healthy life with Wellhub (Gyms pools outdoor classes) <...