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Senior Python Backend Engineer (Part-time, 2 days/week) Code Review & Platform Stability
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Offer summary

(Summary generated by AI based on the full job description)

The project focuses on maintaining and hardening a product platform. The role is to review shipped code and architecture and catch and fix critical issues early. Required technologies include Python, FastAPI and/or Django, strong PostgreSQL skills and experience with third-party API integrations (OAuth, webhooks, rate limits, retries). Responsibilities cover code reviews, identifying bugs, security and performance issues, keeping integrations with Meta/Amazon/Stripe reliable, improving observability (logging, monitoring, alerts), defining backend standards and mentoring developers. Work is part-time 2 days/week, fully remote with flexible days.

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Senior Python Backend Engineer (Part-time, 2 days/week) Code Review & Platform Stability

Company: DEEPLYTREES Maksymilian Królik

from: 1 October 2026
to: 31 October 2026
130 - 145 złnet (+ VAT)/ hr.B2B contract (part time)
Salary details

Part-time: 2 days per week, fully remote, flexible days

Offer parameters
level:senior
working mode:remote
Warszawa, Pustelnik
Warszawa, PustelnikDuża 5AView on map

Requirements

Expected technologies

Python
FastAPI
Django
Docker
Git
REST API
PostgreSQL
CI/CD
CI

Optional technologies

Stripe
Meta API
Amazon Ads API
Redis
Celery
GDPR
AWS

Our requirements

  • 5+ years of commercial backend development in Python
  • Strong hands-on experience with FastAPI and/or Django
  • Proven track record of building and maintaining third-party API integrations: OAuth flows, webhooks, rate limits, retries, async/background jobs
  • Solid PostgreSQL skills: data modeling, migrations, query performance
  • Experience running production systems: CI/CD, monitoring, logging, incident handling
  • Security mindset: authentication, secrets management, handling personal data under GDPR
  • Experience doing thorough code reviews, and the ability to critically review AI-generated code
  • Clear written communication: you can explain what's wrong, why it matters, and how to fix it

Your responsibilities

  • Review backend code and architecture decisions written by our team and AI coding agents, and give clear, prioritized feedback
  • Identify bugs, security vulnerabilities, performance bottlenecks and technical debt, and fix critical issues yourself when needed
  • Keep our many third-party API integrations reliable (Meta, Amazon, Stripe and others): error handling, retries, rate limits, token refresh, webhooks
  • Improve observability: logging, monitoring and alerting, so we catch problems before our users do
  • Define and enforce backend standards for testing, code structure, migrations and deployments
  • Advise on hardening the platform for production as we scale: payments, user data, growing traffic
  • Mentor our fullstack developers through reviews and short technical discussions

About the project

We're looking for a senior backend engineer to be the technical safety net of our platform, 2 days per week. You won't be building most features. Your job is to review what we ship, catch problems early and keep the application stable as we grow.

What we offer

  • Part-time: 2 days per week, fully remote, flexible days
  • B2B contract
  • Real ownership over the technical quality of a growing product
  • A small team where your feedback directly shapes how we build
  • Direct work with the founder, with no corporate layers

About Us

Deeplytrees is building Lens, a creator-marketing platform that helps brands run influencer campaigns end to end. It covers creator discovery, content compliance checks, sales attribution, ad campaigns and creator payouts. The platform relies on many API integrations (Meta, Amazon, Stripe and more), and much of our code is written with AI coding agents while our team owns the architecture and testing.
Senior Python Backend Engineer (Part-time, 2 days/week) Code Review & Platform Stability
130–145 zł / hr. (B2B)
I apply to:
DEEPLYTREES Maksymilian Królik
Warszawa, Pustelnik

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