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Site Reliability Engineer - SRE PPaaS F/M

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Publish Date: Jun 11, 2021

Location: Paris - 75, Ile-De-France, FR

Company: worldline

About Worldline
Worldline [Euronext: WLN] is the European leader in the payment and transactional services industry. With innovation at the core of its DNA, Worldline’s core offerings include pan-European and domestic Commercial Acquiring for physical or online businesses, secured payment transaction processing for banks and financial institutions, as well as transactional services in e-Ticketing and for local and central public agencies. Thanks to a presence in 30+ countries, Worldline is the payment partner of choice for merchants, banks, public transport operators, government agencies and industrial companies, delivering cutting-edge digital services. Worldline’s activities are organized around three axes: Merchant Services, Financial Services including equensWorldline and Mobility & e-Transactional Services. Worldline employs circa 12,000 people worldwide, with 2019 revenue of circa 5.3 billion euros. worldline.com

Worldline fournit à ses clients un large spectre de solutions de paiement sures, fiables et pérennes. L’offre de service s’étend des terminaux pour les marchands (POS) aux services de paiement en ligne en passant par des solutions d’acquisition et de banque en ligne. Un million de marchands et 1200 banques et institutions financières bénéficient déjà des solutions de paiement Worldline. Avec 20000 employées à travers le monde, disposant de nombreux talents parmi les plus brillants de l’industrie du paiement, Worldline invente les nouvelles façons de payer, les futures façons de rendre possible le commerce physique ou en ligne. 

Worldline est organisé en 4 Business Lines : Merchant Services (MS), Terminal Solutions & Services (TSS), Financial Services (FS), and Mobility & E-transactional Services (MTS).


L’une des briques essentielles de la stratégie de la Business Line TSS est la création et la mise à disposition d’une offre cloud, Payment Platform as a Services (PPaaS), dont l’ambition est de permettre à tous les clients et partenaires d’offrir une large et innovante offre de service aux marchands, disponible en tout temps et en tout lieu.




SRE is responsible for ensuring that the cloud infrastructure used to host Worldline solutions delivered « as a Service » is available, reliable, efficient and resilient. Working closely with DevOPS and OPS, SRE provides guidance and expertise to ensure a smooth bridge between Build phase and Run phase.




Develop systems that increase Reliability & Performance:

  • Identify all actions that should be done on the platform
    • To prevent technical debt, weakness such like single point of failures, complex solutions when simpler ones exist,
    • To ensure an easy and early detection of problems,
    • To ensure performance (capacity, response time, overload management, etc…),
    • To ensure the adequation of the databases, their content, their interfaces,
    • To ensure traceability of events, availability of data required for investigations,
    • To ensure monitorability,
    • To prevent shortage of resources,
    • To prevent over-consumption of resources,
    • To help in standardizing the stack, and hence increase efficiency and interoperability
  • Share the rational of these actions with stakeholders (dev, devops, ops, support team, management, marketing),
  • Take them in charge: plan them, implement them, make them happening
  • Communicate to what has been improved, on how to get benefits. Train colleagues when required.
  • Document and share platform knowledge in an appropriate format.


Contribute to Operations:

  • Contribute to support activities and incident management – need based.
  • Contribute to the definition of process and tool selection, providing feedbacks based on field/production experience.
  • Establish a strong link with OPS engineers, Problem and Incident Managers to make sure that engaged actions are aligned with the needs identified from field events.


Handle projects:

  • Take in charge business projects (deployment of systems, migrations, major upgrades, major installations, etc…),
  • Take in charge technical/technological projects (evaluation of stack, deployment of new tools, etc…)




  • At least 15 years of experience in service delivery and operations
  • Experience of solutions exposed to external customers, delivered as a Service with 24x7 constraints, and uptime SLA of at least 99.9%.


Technical skills:

  • Mastering Google Cloud Platform technology and tools, proven experience in building or upgrading complex customer-facing production systems on this platform.
  • Expertise with Linux systems configuration and administration,
  • Mastering virtualization techniques, containerization, dockerization,
  • Mastering networking technologies and components (VPN, IP routing, NAT, load balancing, proxy and reverse proxy, etc…)
  • Mastering security components (SIEM, multi-factor authentication technologies, security monitoring solutions including Wazuh and WAF like Cloudflare or equivalent),
  • Mastering both SQL databases and No-SQL database technologies, as well as search engines including Couchbase & Elastic Search,
  • Comfortable with deployment automation tools and technologies (Terraform, Ansible, Puppet, etc…),
  • Comfortable with monitoring technologies (grafana, prometeus, stackdriver, etc…),
  • Mastering scripting (Python or equivalent).


Other skills:

  • Comfortable both in French and in English,
  • Ability to work in a Safe/Agile team,



Keen to occasionally travel in France (on other WL sites, on data centers).

The 20 000 employees of Worldline are all different but share the same values. You can see it in the way we behave. We are curious and humble – we are learning every day, we keep things simple and everyone engaged. In our fast-moving industry, we are adaptable and life-long learners. Everyone demonstrates the same dedication to quality and efficiency. We have an entrepreneurial spirit and sense of service. Above all, we never turn our back on a challenge. These values nurture a dynamic and innovative team where everyone can develop and grow.

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