Cloud DevOps Engineer – Terminal API Product

About Worldline

At Worldline, we are pioneers in payments technology, committed to creating innovative solutions that make financial transactions secure, accessible, and seamless worldwide. Our diverse team of professionals collaborates across cultures and disciplines, driving progress that benefits society and businesses of all sizes.

We believe that diverse perspectives fuel innovation. We are dedicated to fostering an inclusive environment where all individuals, regardless of background, identity, or experience, can thrive and contribute meaningfully to our shared vision.

The Opportunity

We are scaling our payment terminal platform to support Cloud connected terminals with persistent WebSocket sessions, event-driven transaction processing, and high-availability infrastructure. As we transition from a medium scale architecture to a platform capable of supporting Cloud payment terminals, we need a DevOps Engineer who can bridge the gap between application development and cloud operations. You will own the CI/CD pipelines, deployment automation, container orchestration, and operational health of services including the WS CM ECS cluster, CloudAPI (TAPI Cloud ECS), Lambda-based TransactionManager, and the supporting queue and datastore infrastructure on AWS. This role demands strong technical expertise in cloud architecture, infrastructure-as-code, containerisation, and CI/CD pipelines, combined with excellent problem-solving and communication skills. We welcome applicants from all backgrounds and experiences, believing that our strength lies in our diversity. Your unique perspectives will help us ensure secure, scalable, and efficient cloud operations that power the future of payment technology.

Location: Chennai

Experience: 6 to 10 Years

Key Responsibilities

• Build and maintain CI/CD pipelines for ECS services (WS CM, Cloud API) and Lambda functions (TransactionManager) using GitHub Actions, AWS CodePipeline, or equivalent.

• Manage container build, tagging, and deployment workflows for ECS Fargate services from ECR. • Implement and maintain blue/green and rolling deployment strategies to support zero-downtime releases of WS CM and Cloud API.

• Configure environment-specific infrastructure (dev, staging, prod) using Terraform or AWS CDK, ensuring parity between environments.

• Operate and monitor ECS autoscaling, ALB health checks, and target group configurations for persistent WebSocket workloads.

• Manage secrets and configuration (AWS Secrets Manager, SSM Parameter Store) across all services.

• Build and maintain operational dashboards (CloudWatch, Grafana) covering active WS connections, reconnect rates, queue depths, Lambda errors, and transaction latency.

• Set up alerting and on-call runbooks for critical scenarios: connection state staleness, DLQ backlog, FAILED_TO_SEND_TO_TERMINAL spikes, and Lambda throttling.

• Support load testing infrastructure to validate 10,000+ concurrent WebSocket connections. • Implement log aggregation and structured log pipelines (CloudWatch Logs Insights, OpenSearch, or equivalent).

Technical Skills

✔ CI/CD pipelines (GitHub Actions / CodePipeline)

✔ Docker & container build pipelines

✔ AWS ECS Fargate deployment & management

✔ Terraform or AWS CDK (IaC)

✔ AWS ALB, Target Groups, Health Checks

✔ AWS CloudWatch – dashboards, alarms, logs

✔ AWS Secrets Manager & SSM Parameter Store

✔ SQS monitoring & DLQ alerting

✔ AWS Lambda deployment & versioning

✔ Amazon ECR – image lifecycle policies

✔ Git & branch-based release workflows

✔ Linux / Bash scripting

Required Skills:

• Strong scripting ability in Python or Bash for automation, deployment scripts, and operational tooling.

• Familiarity with application code in at least one language (Node.js, Python, Go, or Java) to diagnose deployment and runtime issues.

• Experience managing infrastructure as code in collaborative Git workflows: PR reviews, code ownership, and change management.

• Understanding of 12-factor app principles, environment-based configuration, and stateless service deployment.

• Comfort reading application logs, interpreting stack traces, and correlating distributed traces to diagnose issues.

• Experience with semantic versioning, release tagging, and artifact management.

• Solid understanding of networking fundamentals: VPCs, subnets, security groups, DNS, and load balancer routing.

• Ability to write clear runbooks, incident post-mortems, and operational documentation.

• Experience with WebSocket-heavy workloads and understanding of connection lifecycle (connect, heartbeat, reconnect, disconnect).

• Familiarity with Redis cluster operations and DynamoDB capacity planning.

• AWS certifications: DevOps Engineer – Professional or SysOps Administrator.

• Experience in fintech, payments, or PCI-DSS regulated environments.

• Exposure to load testing tools: k6, Locust, or Artillery for simulating thousands of concurrent connections. Personal Attributes:

• Strong problem-solving and analytical skills.

• Ability to work independently and as part of a cross-functional team.

• Excellent communication and documentation skills.

• Commitment to continuous learning and staying current with cloud technologies.

Why Join Us

At Worldline, we believe that embracing diversity and promoting inclusion drive innovation and success. We foster a workplace where everyone feels valued and empowered to bring their authentic selves. Through extensive training, mentorship, and development programs, we support your growth and help you make a meaningful impact. Join a global team of passionate professionals shaping the future of payments technology—where your ideas, experiences, and perspectives are appreciated and celebrated.

Equal Opportunity

We are an Equal Opportunity Employer. We do not discriminate based on race, ethnicity, religion, colour, national origin, sex (including pregnancy and childbirth), sexual orientation, gender identity or expression, age, disability, or any other legally protected characteristics. We are committed to creating a diverse and inclusive environment for all employees.