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 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.
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, you’ll 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
.
You’ll 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
15,000+ 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
Don’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.
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. That’s 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, 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.
Our Values 🫀
We own it
: We take responsibility for every project. We make decisions, not excuses.
We learn and teach
: We're 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) 🧘🏽♀️
Save expenses with
Cobee
💰
Language classes 👩🏽🏫
Breakfast in the office and organic fruit 🍏
Nora
discounts 🍱
Free caffeine and theine ☕
Pet Friendly 🐕