Python engineers who can take the analyst's notebook, the founder's script or the data scientist's proof of concept and return a service with owners, alerts and a rollback. Full-time in your team, on the Virtus payroll.
This cell is real, give or take the variable names. It is correct. It is also three weeks away from being something you can put on a rota — and the gap on the right is exactly what you are hiring for.
done 12480
Nothing here is wrong. That is what makes it dangerous — it will run correctly every day until the morning it does not.
A path on someone's laptop becomes an object store key, a signed URL and a retry when the upload is still in flight.
Pandera or Pydantic at the boundary, so a renamed column fails loudly on row zero instead of silently producing nulls.
A timeout, a bounded retry with jitter, a cached last-known-good rate, and an alert when the cache is what got used.
A pickle with no version is an outage waiting to happen. Model artefacts get a registry, a hash and a rollback path.
Idempotency. Re-running must not double-count, and a partial failure must be safe to replay.
Structured logs with a correlation id, a metric on rows processed, and an alert that names the owner.
Chunking, vectorisation, or a move to Polars or DuckDB — decided by measurement, not by preference.
The rest of the job
FastAPI or Django REST, typed with Pydantic, documented by OpenAPI, and deployed as a container rather than a cron job.
Celery, RQ or Arq with visibility timeouts, dead-letter queues and tasks that are safe to retry.
pandas, Polars and DuckDB, plus the SQL underneath — and knowing when the answer is a warehouse query rather than Python at all.
Long-running scrapers, ERP connectors and file feeds, built to survive the source changing without telling you.
uv or Poetry, pinned and locked, one Dockerfile, and an environment that reproduces on someone else's machine.
pytest with fixtures that are not a fixture soup, factory data, and coverage on the branches that matter rather than a headline number.
If you are hiring to harden something that already exists, hire senior. If you are hiring to add endpoints to a service someone else designed, mid-level is the better value.
If it is really a pipeline, hire a data engineer
Builds endpoints and jobs in an existing service. Comfortable with the framework; still learning production hardening.
5–8 yrs $34–44/hr
Turns a proof of concept into a service with owners, alerts and a rollback. Reads a profiler.
8+ yrs $44–58/hr
Sets the architecture and the packaging standards across teams, and picks the fights worth having about typing.
#J-18808-LjbffrHire Python Developer • Calgary, AB, Canada
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