Results-Driven Senior Backend Engineer

Julien Pons

Results-Driven Senior Backend Engineer

I build scalable, data-driven backend platforms

0+

years of experience

Backend experience in production on demanding environments.

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production deliverables

Features, APIs, and automations deployed with business impact.

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backend services designed/refactored

Design and evolution of reliability-focused critical components.
runtime/python_pipeline.py

Delivery Engineering

GitHub Actions — from code to container build and release

Python backend (FastAPI): quality gates on every PR, Docker image build only after green tests, push to AWS ECR, staging auto-deploy, production release with non-regression functional tests (Railway-like velocity, production-grade safety).

01

Pull Request

FastAPI backend — quality gates on every change

running
02

CI Tests

unit · integration · security scan

pending
03

Docker Build

multi-stage image from repo Dockerfile

pending
04

Push ECR

Image signing

pending
05

Deploy Staging

functional API checks on live pre-prod

pending
06

Release Prod

canary (or blue/green) + non-regression + auto rollback

pending
feature/*PR → CI
  • ruff
  • mypy
  • pytest unit
  • pytest integration
  • docker build dry-run
stagingAuto deploy pre-prod
  • build image
  • push ECR staging tag
  • deploy
  • smoke (basic testing healthcheck, one critical path..) + functional fast
mainControlled release
  • promote validated image
  • canary deploy (if possible via monitored metrics and load balancer)
  • non-regression suite
  • tag semver
.github/workflows/release-pipeline.yml

System Design

Architecture

01PostgreSQL (Partitioning, Indexes, Window Functions, Atomic Transactions)
02Microservices event-driven architecture and queuing (Celery, BullMQ, Redis Pub/Sub, HTTPs API, MQTT, Pg Listen/Notify, SQS, Redis)
03Docker Compose + Swarm + Traefik containerization for service discovery and routing
04Cloud and bare-metal delivery: Vercel, Railway, AWS ECR, AWS SQS, RouteDNS, Scaleway)
05CI/CD (Jenkins, GitHub Actions) and reliability-focused observability
06AI agents and Model Context Protocol implementation (RAG)

Core Skills

Backend, data and cloud execution layer

PostgreSQL

advanced

Comfortable with PostgreSQL and able to design and tune for performance.

  • Indexes
  • Aggregations
  • explain analyze
  • pg_stat_statements
  • CTE
  • Window Functions
  • Partitioning
  • UUIDv7
  • JSONB

MongoDB

medium

A short experience with MongDB, but understand core concepts (aggegations pipelines, indexing both normal and TTL indexing)

  • Collections
  • Indexes
  • Aggregations
  • TTL Indexes

Python Backend

advanced

4 years of experience with Python and able to design and implement scalable backend services.

  • FastAPI
  • Pydantic
  • PyTest
  • Pip / uv
  • Django
  • Pandas
  • Celery
  • Asyncio
  • Rate Limiting
  • Data caching

TypeScript Full-stack

advanced

Designed and bootstrapped either backend through NestJS and frontend through Next.js.

  • NestJS
  • React / Next.js
  • Caching
  • Authentication
  • BullMQ
  • Providers
  • Controllers
  • Middleware
  • Guards
  • Interceptors

Linux

advanced

Comfortable with command-line tools for scripting and daily operations

  • man 2
  • tail
  • cat
  • awk
  • grep
  • sed
  • pipes
  • std 0,1,2
  • nohup
  • <<EOF
  • ssh
  • Reverse search

Container & Swarm

advanced

Comfortable with Docker Compose and Swarm to set up environments ready to ship to production

  • Docker
  • Docker Compose
  • Swarm
  • Traefik
  • LetsEncrypt
  • Multi-stage Image build
  • Container Registry

Cloud Delivery

advanced

Deployment of multi-environment and robust workflows oriented production.

  • Railway
  • Vercel
  • AWS ECR
  • AWS SQS
  • RouteDNS

CI/CD

advanced

Pipelines GitHub Actions, checks automated and continuous quality.

  • GitHub Actions
  • Git
  • CI/CD

AI Agent

medium

Design and implementation of backend agents and MCP tools to integrate AI in production.

  • FastMCP
  • Mastra
  • Langfuse

Companies I've helped scale

Digital Virgo
PrismaMedia
The Brand Collector
IItengo
Mob Partner (Cheetah Mobile)
Key Consulting
Digital Virgo
PrismaMedia
The Brand Collector
IItengo
Mob Partner (Cheetah Mobile)
Key Consulting