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Serge OnanaSO

Serge Onana

Supermalter

Senior Lead in Monitoring & Observability

€850/day
3 projects
Paris, FR
8-15 years
Monitoring Governance and Strategy
Monitoring and Observability
Leadership and Management
Budget Management
Opentext

Average response time: 1 hour

Freelancer profile translated to English.
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About Serge

For 12 years, I have been supporting the transformation of production platforms towards "monitoring by design" to enhance operational resilience, compliance (DORA, NIS2, SWIFT CSCF), and business performance. After an initial 3 years focused 100% on technical aspects (network/system supervision, Scripting, APM), I progressively took on roles as a functional referent, manager, and governance lead. Today, I engage at the IT Steering Committee level to establish the rules: "No Monitoring / No Go Live", structure project GATE processes (Gate 0 to Run) and RACI matrices, arbitrate catch-up priorities, and manage MTTD / MTTR / monitoring coverage KPIs and continuous improvement plans.

  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • Société Générale - CIB
    Monitoring and Production Tooling Referent – Digital Banking and Financial Markets
    BANKING AND INSURANCE
    December 2021 - November 2025 (3 years and 11 months)
    France
    • Design and deploy the monitoring architecture for front-to-back processing chains (digital channels, APIs, middle and back office).
    • Gather and challenge monitoring requirements from project managers and business stakeholders (SLA, SLO, performance & risk indicators).
    • Lead the integration of APM / log management solutions into DevOps pipelines (Dynatrace, AppDynamics, Splunk, Elastic, Grafana, Prometheus).
    • Build real-time dashboards for service centers and management (MTTD, MTTR, availability, error transaction rates, customer journey performance).
    • Coordinate major incident management with N2 / N3 teams and the crisis unit, lead post-mortems and action plans.
    • Ensure regular reporting to the production Steering Committee: service levels, major incidents, trends, risks, improvement plans.
    • Supervise a team of 4 monitoring engineers, distribute workload, prioritize tasks (projects vs. RUN), and track skill development.
    Project Management Cybersecurity Monitoring Observability Supervision
  • Crédit Agricole CIB
    GIT Monitoring and Observability Lead
    November 2017 - October 2021 (3 years and 11 months)
    France Code, Montrouge, France
    • Contribute to defining the Monitoring & Observability target state and translate it into concrete rules within the project lifecycle (Gate 0 to Gate 5 – Run): control checklists, typical deliverables, operational GO/NO GO criteria, RACI updates.
    • Apply and enforce the "No Monitoring / No Go Live" principle: gap analysis, development of catch-up plans (standard / fast track), tracking actions until compliance is achieved.
    • Configure and evolve monitoring tools: creation of probes, indicators, and supervision views, service quality control, KPIs (MTTD, MTTR, coverage rate, alert noise, platform stability).
    • Work daily with project teams to formalize monitoring needs and implement them: data to collect, thresholds, logs to retain, business and technical dashboards.
    • Perform and supervise technical implementation within group solutions: Open Text Operations Bridge, NNM, Optic Datalake, HSO, AWS / GCP integrations, activation of observability via OpenTelemetry (traces, metrics, logs).
    • Lead Monitoring follow-up committees with technical teams, production, security, and business units: content preparation, metrics analysis, request prioritization, catch-up backlog updates.
    • Prepare materials for operational resilience reviews and audits (internal, regulatory): log extraction, surveillance evidence, business continuity plan documentation.
    • Act as a technical referent within a team of 8 Monitoring & Observability engineers / product owners: level 3 support, best practice sharing, daily mentoring and skill development (without direct HR management).
  • RATP
    Systems/Networks Supervision & Monitoring Engineer
    January 2013 - January 2017 (4 years)
    Paris, France
    • Administer and evolve supervision tools (Centreon / Nagios, Cacti, HP OpenView) for network and server equipment.
    • Model supervision for the MPLS backbone and inter-site links (loss of flow detection, latency, bandwidth saturation).
    • Develop supervision scripts (Bash, Python) for specific metric collection, event correlation, and some auto-remediation actions.
    • Define thresholds, alert rules, and escalation procedures in conjunction with systems, network, and application teams.
    • Provide N2/N3 support for production incidents related to supervision, participate in on-call rotations.
    • Document monitoring architectures, contribute to operational documentation and change reviews.

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Education

  • Computer Science & Networks Engineering Degree
    Télécom Sud Paris - Institut Mines Telecom
    2013
    Diplôme d'Ingénieur Informatique & Réseaux
  • ITIL v3 foundation
    2016
    ITIL v3 foundation
Check out Serge's education

Skill set

Project Management
Corporate Finance
Corporate Restructuring
Internal Audits
System Integration
Process Management

Categories