Application Support Engineer-L3
Posted Updated
Summary
L3 application support engineer for a card-payments platform: owns P1–P3 incident resolution, RCA and problem management, does deep database diagnostics (MySQL, PostgreSQL, SQL Server), writes PowerShell/SQL scripts and investigates .NET logs, on a day shift with 24/7 on-call rotation across AWS-based infrastructure.
Role & responsibilities
- Own P1P3 incident resolution, RCA, and problem management
- Advanced diagnostics across MySQL, PostgreSQL, SQL Server, app logs, queues and integration interfaces
- Author new SQL and PowerShell scripts; mid-level .NET log and code investigation
- Patching, backup, and DR operations execution and validation
- Coach L2 engineers; maintain runbooks, KEDB and knowledge articles
- Hold SME ownership in one domain: Reporting / Clearing / Chargeback / Patching / Host interface / Message processing
- Represent support in change reviews and post-incident reviews; drive preventative actions to closure
- Day shift with on-call rota supporting 247 cover
Preferred candidate profile
- MySQL, PostgreSQL deep hands-on; SQL Server mid-level
- PowerShell and SQL — authoring new scripts independently
- .NET — mid-level (code and log-level diagnostics)
- AWS (ECS, EKS, RDS, CloudWatch); Coralogix, PagerDuty, Jira SM
- Payments domain — card issuing and processing, plus one of ISO 8583 / ISO 20022, clearing and settlement, or chargebacks and disputes
- PCI DSS and FCA operational resilience — working knowledge
- ITIL-aligned incident, problem, and change management
- SRE practice — SLI/SLO definition, error budget tracking, toil reduction, blameless postmortems
- Infrastructure-as-code (Terraform / CloudFormation) and CI/CD pipelines for automated, auditable remediation
Good to Have: Kubernetes operations at scale • Distributed tracing (OpenTelemetry) • Chaos engineering • AI-assisted troubleshooting tooling in a controlled environment • Confluence • Payments/fintech background