Manuel Rui Fernandes

S

Senior Backend Engineer at Everline Health · API platforms

Everline Health
Lisbon, Portugal · WET (UTC+0)
3+ years experience
École Polytechnique
English, Portuguese
Messaging unavailable

Overview

Based in Lisbon. I work on API platforms at Everline Health. Cut p99 latency on the public API services from 723ms to 165ms. Mentored 15 engineers through their first promotion. Most at home with Python and AppSec.

Good reasons to reach out
  • Questions about API platforms
  • Thoughtful intros to people in my field
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  • Crypto token projects
  • Requests to fix your code for free
  • SEO and link-building offers

Replies on weekday evenings

Skills
rate limitingAppSecDjangoPostgreSQLRESTPython

Experience

  1. Senior Backend Engineer
    Dec 2025 - Present
    Everline Health · 10 mo · Full-time · Lisbon, Portugal
    • Led the migration of 76 services to rate limiting.
    • Brought on-call pages for public API down from 17 a week to 4.
    • Built the experimentation framework 6 product teams use to ship changes safely.
  2. Backend Engineer
    Oct 2023 - Dec 2025
    H&M Group · 2 yr 2 mo · Full-time · Lisbon, Portugal
    • Moved 61% of public API traffic off a legacy monolith without a customer-facing incident.

Projects

API platforms benchmark
2022

Reproducible benchmarks comparing REST and Python on real workloads.

References

No references yet.

Education

  1. École Polytechnique
    Ingénieur, Information Technology
    2019 - 2023

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