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    Allerin

    p95 latency ↓46% in 6 weeks

    Enterprise SaaS — Platform Modernization

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    Context

    A high-growth SaaS platform was missing p95 targets during peak hours. Feature work couldn't stop, and security debt was accumulating.

    Approach

    • Modular-monolith plan; dual-run/blue-green cutovers
    • Distributed tracing on hot endpoints; DB index & cache tuning
    • Error budgets + observability with SLOs
    • No feature freeze; release guardrails
    p95 latency
    840 ms → 450 ms
    -46%
    Critical CVEs
    7 → 0
    pre-go-live
    Infra spend/month
    $42k → $33k
    -21%
    Error rate
    0.68% → 0.39%
    -43%

    Stack & Integrations

    Rails
    Postgres
    Redis
    Grafana/Prometheus
    Nginx

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