Mariana Costa
Senior Software Engineer · Backend and data platforms
Rua Augusta 112, 1100-053 Lisboa, Portugal · +351 912 345 678 · mariana.costa@example.com · linkedin.com/in/mariana-costa-dev

PROFILE
Backend engineer with eight years of Python experience building ingestion and orchestration services for analytics products. Technical owner of a platform moving 4 TB a day with a 15-minute freshness SLA. Comfortable owning a service from design review to on-call, and known for clear runbooks and patient mentoring.

EXPERIENCE
Senior Software Engineer, Northwind Analytics · Lisbon (Mar 2022 – present)
  - Technical lead for the ingestion platform: 14 FastAPI services, Kafka consumers and PostgreSQL, serving 60 enterprise customers.
  - Led the migration from a nightly batch to streaming ingestion, cutting end-to-end latency from 6 hours to under 10 minutes while volume grew threefold.
  - Introduced a schema registry and contract tests between producers and consumers, reducing ingestion incidents by 70% year over year.
  - Run the team's weekly design review rotation; mentor two junior engineers and one intern.
  - On-call one week in four for the ingestion tier; wrote the runbooks the whole team uses.

Software Engineer, Contoso Logistics · Lisbon (Sep 2018 – Feb 2022)
  - Built order tracking and shipment APIs in Django and Celery used by 300 warehouse operators.
  - Moved 20 services from VMs to Kubernetes with Helm charts and GitHub Actions pipelines; deployment lead time fell from days to under an hour.
  - Owned the on-call rotation for two years and halved the page volume by fixing the top alerts.

Junior Developer, Fabrikam Digital · Porto (Jul 2017 – Aug 2018)
  - Developed internal reporting tools in Python and Flask; automated monthly finance exports.

TECHNICAL SKILLS
Languages: Python (asyncio, FastAPI, Django, pytest, mypy), SQL, Bash, some Go
Data and messaging: PostgreSQL, Kafka, RabbitMQ, Redis, Avro and a schema registry
Platform: Kubernetes, Helm, Docker, GitHub Actions, Terraform (basics), Grafana, OpenTelemetry
Practices: design reviews, incident management, runbooks, mentoring

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EDUCATION
BSc Computer Science, Universidade do Porto, 2017

CERTIFICATIONS
Certified Kubernetes Application Developer (CKAD), 2023

LANGUAGES
Portuguese (native), English (fluent, C1), Spanish (B1)
