Senior / Principal Software Engineer (Cybersecurity) Castelo Branco

About us

Slash
ID is building a generation identity platform that helps organizations secure all identities—human and
- human—across complex cloud environments. Our Identity Protection product detects and prevents advanced threats by continuously monitoring credentials, privileges, and activity across cloud and Saa
S systems.

Security, scalability, and reliability are core to everything we build. Our customers rely on our systems for critical infrastructure protection, and we aim to deliver high availability and latency service levels that meet grade expectations.

We’re a startup operating with lean processes, fast decision‑making, and a collaborative mindset. You’ll join a small, highly skilled team solving complex technical challenges with world‑level impact.

About the role

We’re looking for a Senior or Principal Software Engineer with experience building backend systems for security or infrastructure products. This is a full-time, hands-on engineering role focused on designing and developing Slash
ID’s Identity Protection platform.

As an engineer at Slash
ID, you will:

• Design, build, and maintain high‑performance backend services for identity threat detection and response pipelines
• Develop and scale infrastructure that processes identity data and security events from multiple cloud environments
• Implement systems to track, correlate, and analyze activity across credentials, tokens, permissions, and roles
• Define detection logic, enforce policy controls, and prevent misconfigurations
• Create monitoring, logging, and alerting systems that provide deep visibility into service health and user activity
• Contribute to technical architecture decisions and write clear design documentation
• Take part in code reviews and
  - call rotations
• Partner with frontend engineers to expose backend capabilities in the Slash
  ID Console
• Write API-facing and internal documentation as needed

You will use

• Go (Golang)
• Neo4j
• Big
  Query
• Postgre
  SQL and My
  SQL
• Redis
• Docker
• Terraform

You are a good fit if you:

• Want to build great products, and not just backend features
• Have experience building scalable, secure backend systems in production environments
• Have a strong understanding of native architecture and distributed systems
• Have worked on focused products, such as identity, access control, threat detection, or SIEMs
• Have experience with Neo4j or other graph databases
• Have a deep understanding of application security, including authentication, authorization, and secrets management
• Are comfortable building data pipelines and services that process large volumes of events in real time
• Care about engineering best practices, test coverage, observability, and performance optimization
• Work well in
  - paced environments with a high degree of autonomy
• Are thoughtful in code and communication, with attention to user and developer experience
• Are confident writing high‑quality Go code (or are comfortable picking it up quickly)

Please note

• The role level (Senior or Principal) will depend on your experience and interview performance
• The team is based in Europe and we’re looking for candidates in compatible time zones
• Unfortunately, we cannot sponsor VISAs at this time
• Slash
  ID is a first company with flexible working arrangements
• For candidates outside the US, employment is via B2B contract or employer of record