Senior Backend Engineer, Authentication and Authorization Lisboa

Overview

At Pleo, we’re on a mission to revolutionise the way businesses manage company spending. No more outdated processes, clunky spreadsheets, or frustrating delays - we believe spend management should be seamless, empowering, and surprisingly effective for finance teams and employees alike. We’re creating tools that promote autonomy, foster trust, and let businesses focus on what truly matters.

We’re looking for a Senior Software Engineer to join our Authentication & Authorization team at Pleo. In this role,
- u2019ll help build and evolve secure, scalable systems that handle authentication and authorization across our platform. You-u2019ll be part of a
- new team responsible for renewing our approach to identity, access, and trust as we scale our product. If
- u2019re excited about tackling complex technical challenges, collaborating across teams, and making authentication surprisingly easy for developers, this is the opportunity for you!

What You’ll Be Doing

• Design and develop robust, scalable components of our authentication and authorization systems
• Collaborate with product, platform, and security teams to align solutions with business and infrastructure needs
• Drive quality through best practices in testing, observability, and operational excellence
• Mentor and guide junior engineers, fostering a culture of learning and curiosity
• Influence technical direction, contributing to design decisions that balance security, performance, and developer experience

What You Bring

• Deep technical expertise in building scalable systems and APIs
• Strong collaboration and communication skills, especially when working
  - functionally
• A passion for
  - solving, particularly in identity and access domains
• A proactive mindset, with the ability to navigate ambiguity and drive clarity
• Experience with cloud infrastructure (AWS or GCP), Kubernetes, and distributed systems
• Experience working with authentication and authorization standards (OAuth, OIDC, SAML etc. )
• A background in Kotlin, Java or similar backend languages
• Bonus: Experience with
  - party authentication providers like Auth0 or AWS Cognito

Who You’ll Be Working With And Reporting To

You-u2019ll work closely with teams in Product Engineering, Backend Core, and Security. Our team of authentication-focused engineers is highly collaborative and dedicated to building foundational systems that keep Pleo secure and flexible. You’ll also partner with teams across Infrastructure and Developer Experience to drive adoption and impact.

How You’ll Develop In This Role

• Lead the delivery of key authentication components that enable secure and seamless user and service interactions
• Collaborate with platform teams and product teams to improve authentication security
• Grow your skills in platform architecture, security engineering, and
  - team influence

Salary Range

The annual salary for this position varies based on your location:

• United Kingdom: £80, 400 - £85, 500
• Spain/Portugal: 87, 100€ - 92, 500€

We’re happy to share more about our approach to pay and this range during your first call with us!

Benefits

• Your own Pleo card (no more
  -
  - pocket spending!)
• Lunch is on us for your work days - catered meals or a lunch allowance based on your local office
• Comprehensive private healthcare - coverage options include Vitality, Alan or Médis
• 25 days of holiday + public holidays
• Hybrid and fully remote working options
• Option to purchase 5 additional days of holiday through a salary sacrifice
• Free mental health and
  - being support through Mynd
  Up
• Paid parental leave

Why join us?

Working at Pleo means
- u2019re working on something very exciting: the future of work. Our mission is to help every company go beyond the books. Pleo means ‘more than you’d expect’, and
- u2019s been the secret to our success over the last 8 years. We believe company spending should be delegated to all employees and teams, automated, and drive a culture of responsible spending.

About Your Application

• Please submit your application in English
• We treat all candidates equally: apply through our application system
• We value diversity and encourage applicants from all backgrounds
• When you submit an application we process your personal data as a data processor

Seniority level

Mid-Senior level

Employment type

Full-time

Job function

Engineering and Information Technology