Senior Python Back-End Engineer - FastAPI & PostgreSQL

Tech Aalto; New South Wales; On-site; AUD 140,000 - 180,000; Full time

Job summary

Tech Aalto is seeking a Senior Full Stack Developer with a strong backend focus to design, build, and operate production-grade Python services. You will own API design, PostgreSQL performance, and collaborate with frontend teams to integrate React/Next.js UIs with Python backends.

We value deep Python expertise, hands-on FastAPI work, testing discipline, and experience running live systems in the Banking domain. Onsite collaboration is expected in NSW, Australia.

Qualifications

• 5+ years professional software development experience, with at least 3 years onsite in development projects.
• 4+ years of core Python development experience (not just scripting).
• 2+ years hands-on experience building services with FastAPI (or equivalent modern ASGI frameworks).
• 3+ years of production PostgreSQL experience, including schema design, indexing, migrations, and query tuning.
• Strong familiarity with asyncio and concurrent patterns in Python; practical understanding of the GIL.
• Experienced with pytest for unit/integration testing and CI pipelines.
• Experience with Poetry and pip-tools for dependency management and reproducible environments.
• Experience running ASGI servers (uvicorn) in production.
• Frontend experience: 2+ years with React.js or Next.js and integrating JS frontends with Python backends.
• Ability to describe at least one production incident you helped resolve and one performance optimization implemented.

Responsibilities

• Design, build, and maintain backend services using Python and FastAPI for high-availability production systems.
• Own API design and implementation, including OpenAPI specs, versioning, and backward compatibility.
• Implement and maintain data models, migrations, indexing, and query tuning in PostgreSQL.
• Write comprehensive automated tests (unit, integration) with pytest and maintain CI/CD test pipelines.
• Manage dependencies with Poetry and pip-tools for reproducible builds.
• Implement async patterns and concurrency considerations; understand GIL implications.
• Instrument, monitor, and troubleshoot production incidents; lead post-incident reviews and remediation.
• Collaborate with frontend engineers to integrate React/Next.js UIs with Python backends; define contracts.
• Perform performance tuning, caching, and optimization of services and DB queries.
• Participate in architecture design, code reviews, and mentoring junior engineers.

Skills

Core Python

FastAPI

PostgreSQL

pytest

Asyncio

OpenAPI

React/Next.js integration

Code review & mentoring

OpenAPI specs

Tools

Poetry

pip-tools

uvicorn

Docker

Kubernetes

GitHub Actions

GitLab CI

Job description

Tech Aalto is seeking a Senior Full Stack Developer with a strong backend focus to design, build, and operate production-grade Python services. You will own API design, PostgreSQL performance, and collaborate with frontend teams to integrate React/Next.js UIs with Python backends.

We value deep Python expertise, hands-on FastAPI work, testing discipline, and experience running live systems in the Banking domain. Onsite collaboration is expected in NSW, Australia.