Site Reliability Engineer - Mobile Focus

Site Reliability Engineer (SRE) - Mobile Focus

CONTEXT

Our client is a significant e-commerce company operating high-traffic mobile (iOS and Android) and web applications. To meet increasing demands for service quality and scale, they are expanding their SRE team to ensure end-to-end reliability of their mobile and backend ecosystems.

MISSION OF THE PROVIDER

**Reliability, Availability & Performance**

• Define and monitor Service Level Indicators (SLI) and Service Level Objectives (SLO) for critical mobile user journeys (login, data loading, payment, push notifications).
• Ensure high availability of backend APIs consumed by the mobile application, collaborating with backend teams.
• Contribute to reducing API response times (target < 100 ms at the BFF level, down from ~3 seconds).
• Implement edge caching and optimize mobile network performance.

**Observability Focused on User Experience**

• Deploy full-stack observability (backend + mobile) using Splunk, Grafana/Prometheus, CloudWatch (AWS), and APIGEE.
• Correlate technical data with user sentiment (App Store/Google Play reviews).
• Verify production monitoring coverage and identify blind spots.

**Incident Management & On-Call**

• Participate in on-call rotations.
• Detect, qualify, and dispatch incidents to the appropriate teams.
• Coordinate remediation actions and write blameless post-mortems.
• Monitor production status and response times.

**Safe Deployments & Automation**

• Implement progressive deployment strategies (canary, blue/green) and automated rollbacks.
• Utilize feature flags to manage risks on the mobile side.
• Synchronize backend deployments with mobile releases.

**Scalability & Peak Load Management**

• Anticipate and handle traffic peaks (marketing campaigns, mass push notifications, business events).
• Implement dynamic autoscaling for APIs and optimize cloud costs.

**Security & Compliance**

• Secure mobile/backend communication (JWT token rotation, rate limiting, secret and API key management).
• Protect APIs against abuse and abnormal traffic.

**Collaboration & Reliability Culture**

• Work closely with iOS/Android developers, backend teams (BFF, API), product teams, and customer support.
• Contribute to architectural decisions and integrate reliability from the design phase (reliability by design).
• Produce and facilitate SLO/SLI/SLA dashboards, post-mortem analyses, and a reliability roadmap.
• Participate in product rituals and weekly analysis of user feedback.

REQUIRED PROFILE

**Technical Skills Required**

• Solid experience in SRE or MCO for mobile (real iOS/Android) and web application environments.
• Proficiency with observability tools: Splunk, Grafana/Prometheus, CloudWatch (AWS).
• Good knowledge of BFF/REST API architectures, particularly in NodeJS/GraphQL environments.
• Understanding of frontend web (VueJS, NestJS) and mobile (Android/Kotlin, Swift) stacks.
• Experience with JS web servers (e.g., Nginx).
• Knowledge of SLI/SLO/SLA concepts and ability to build and analyze reliability KPIs.

Key skills/competency

• Site Reliability Engineering (SRE)
• Mobile Observability
• API Performance
• Incident Management
• On-Call Rotation
• Automated Deployments
• Scalability
• Cloud Optimization
• Security
• Reliability Engineering