Senior Site Reliability Engineer (Contractor)
Introducing Masabi
// At Masabi, we’re driving the fare payment revolution, powering the journeys of millions all over the world. We build fare collection platforms that allow riders to seamlessly buy and present tickets for public transport either on their mobile phones, from a ticket machine, or even by tapping their bank card to travel.
Our Justride platform is used in over 250 locations globally, including some of the largest cities in the world. With our industry-first mobile ticketing SDK, we’ve partnered with large players in the transport space, including Uber, Moovit and Transit.
Your own journey is important to us too. Choosing a role here means joining a network of innovators from all walks of life; a group of passionate individuals who consistently deliver. Here, you’ll find the tools you need to build the career you want. Whether you’re taking the direct route or trying a new path, we’ll support you no matter what.
Role Description_
// We're looking for a Senior Site Reliability Engineer to join Masabi and be at the forefront of ensuring our platform's reliability, performance, and security. In this role, you'll be pivotal to scaling and modernising our platform while ensuring uptime, performance, and security. You'll work across legacy and modern infrastructure, drive key improvements, and collaborate closely with architecture and product teams to enable reliable delivery across the business.
Location_
// This role is available in a fully remote model for contractors based in Argentina.
Responsibilities_
Automation and Scalability: Drive automation to reduce operational overhead and human error. Build CI/CD pipelines, develop Infrastructure as Code (IaC) using tools like Terraform and CloudFormation, and design scalable systems to handle high traffic while optimising resource utilisation. Drive the effort to scale up new environments as we expand globally.
Continuous Improvement: Refine processes, tools, and workflows to enhance system reliability, scalability, and efficiency. Plan capacity to anticipate future needs and support high-performance systems.
Security and Compliance: Ensure infrastructure meets organisational security standards and supports compliance frameworks like SOC 2 and PCI.
Monitoring and Reliability: Maintain real-time monitoring systems aligned with SLIs and SLOs, ensuring uptime and performance meet or exceed SLAs. Set up proactive alerting mechanisms to address issues before they escalate.
Cost Optimisation: Monitor and optimise cloud infrastructure costs through autoscaling, rightsizing, and architectural reviews to balance cost-effectiveness with reliability.
Disaster Recovery and Redundancy: Implement failover strategies, disaster recovery plans, and redundancy to ensure system resilience under all conditions.
Incident Management: Respond to production incidents, minimise downtime, and restore availability. Perform root cause analysis, implement preventive measures, and contribute to post-incident reviews to share lessons learned.
Collaboration and Mentorship: Partner with developers to design reliable, maintainable systems. Coach teams on best practices for reliability, scalability, and observability, fostering a culture of ownership.
Documentation and Knowledge Sharing: Maintain detailed documentation for infrastructure, incident response, and workflows. Develop playbooks and runbooks to ensure seamless knowledge transfer.
// Our platform is JVM-based and cloud-native, hosted on AWS. We utilise standard tooling, including Gitlab, Terraform, CloudFormation, Puppet, Kibana, Grafana and Confluent Cloud.
Key Tools and Technologies SREs Work With_
Monitoring: Grafana, Prometheus, CloudWatch, Pingdom, Kibana
CI/CD: GitLab CI, Rundeck
IaC: Terraform, CloudFormation
Cloud Platforms: AWS
About You_
Significant experience in SRE or related roles, with a proven track record in building and maintaining reliable systems
Expertise in AWS Cloud technologies
Hands-on experience with Terraform and Grafana, along with strong knowledge of security principles and networking components
Experience in building pipelines and robust CI/CD infrastructure
A collaborative team player who approaches projects with an open mind and prioritises security
Passionate about leveraging technology to drive advancements while ensuring reliability and security
Excellent communication skills, a collaborative mindset, and a willingness to learn and contribute to team success
Self-sufficient and capable of working independently, while also knowing when to seek support or input
Desirable_
Familiarity with PCI DSS v4 Compliance requirements is a plus
AWS Cloud certification
Experience with orchestrating containers
Careers at Masabi are for people going places - driven by a mission to make transit fair and accessible for all.
We are a network of innovators from all walks of life, passionate about making a difference. At Masabi, we operate with openness and trust, creating an environment where everyone feels empowered to bring their whole, authentic selves to work.
Whoever you are, just be yourself. We welcome applications from underrepresented backgrounds and encourage you to share your pronouns at any stage. Together, we simplify journeys, remove barriers, and improve daily life for millions.
Why Join Masabi?
Driven by Purpose – We believe in journeys made simple. The work isn’t always easy, but the best things never are.
Encouraged to Accelerate – Masabi is going places and our people are in the driving seat. Whether you’re taking the direct route or exploring new paths, we support your journey.
Advancing with Empathy – We put people first and foster a culture of learning, not blame. No matter your cargo, we share the load.