Senior DevOps Engineer (AWS & Data Infrastructure)

paytech is a fintech company developing a B2B SaaS platform for payment processing and orchestration. We are looking for an experienced Senior DevOps Engineer to help us scale, automate, and continuously improve our cloud infrastructure.

What you'll do :

• ✔️ Own and improve AWS production infrastructure: availability, security, scalability, and performance;
• ✔️ Automate infrastructure with Terraform and Ansible;
• ✔️ Build and improve CI/CD pipelines and deployment processes;
• ✔️ Manage Linux systems, networking, and load balancers/reverse proxies (nginx, HAProxy);
• ✔️ Improve monitoring, logging, and alerting;
• ✔️ Handle production incidents, perform root cause analysis, and prevent recurrence;
• ✔️ Help design and operate our new DWH on ClickHouse and Amazon Kinesis;
• ✔️ Strengthen disaster recovery, backups, and capacity planning;
• ✔️ Optimize AWS costs without compromising reliability;
• Work closely with development and security teams on architecture.

Job Requirements:

Must Have

• ✔️ 5+ years in DevOps, SRE, or infrastructure roles managing production environments;
• ✔️ Strong Linux administration, including troubleshooting and performance tuning;
• ✔️ Hands-on AWS experience (EC2, VPC, IAM, RDS); Experience with Terraform and/or Ansible;
• ✔️ Solid networking knowledge: TCP/IP, DNS, routing, VPN, TLS;
• ✔️ Strong knowledge of nginx, reverse proxies, and load balancing;
• ✔️ Experience building CI/CD pipelines;
• ✔️ Experience with Prometheus, Grafana, or similar tools;
• ✔️ Scripting in Bash and/or Python;
• ✔️ Understanding of infrastructure security, high availability, and disaster recovery;
• ✔️ Proven ability to troubleshoot complex production issues;
• ✔️ Ownership mindset and ability to design and deliver solutions independently.

Nice to Have

• ✔️ Experience deploying, operating, or optimizing ClickHouse;
• ✔️ Familiarity with Amazon Kinesis, Apache Kafka, or other streaming technologies;
• ✔️ Experience supporting data warehouses, ETL/ELT pipelines, or real-time data platforms;
• ✔️ Experience with Oracle Database, PostgreSQL, or Redis;
• ✔️ Familiarity with SRE practices, including SLI/SLO definitions, incident management, and capacity planning;
• ✔️ Knowledge of security and compliance requirements in fintech, particularly PCI DSS;
• ✔️ Experience designing highly available, fault-tolerant, or multi-region AWS architectures.

What we offer:

• ✔️ Meaningful challenges: Work on production payment infrastructure where reliability, security, and performance truly matter;