Daniel Osei
Senior software engineer
Toronto, ON, Canada · daniel.osei@example.com · (416) 555-0142 · linkedin.com/in/daniel-osei
Summary
Backend and platform engineer with seven years building Go and Python services on AWS. Focused on latency, reliability and cost, and on helping newer engineers ship safely.
Experience
Senior software engineer
2021 – nowCorvane Logistics, Toronto
- Cut p95 latency on the shipment-tracking API from 420 ms to 140 ms with Redis caching and three rewritten PostgreSQL queries.
- Led the move of the billing module from a monolith to three Go services on Kubernetes, with no downtime at cutover.
- Cut incidents from 9 to 3 per quarter with alerting, runbooks and staged rollouts across a Kafka-based pipeline.
- Lowered monthly AWS cost by about 18% by right-sizing instances in Terraform and retiring unused queues.
- Mentored three engineers and ran weekly design reviews for a team of eight.
Software engineer
2018 – 2021Mintleaf Software, Toronto
- Built Django REST APIs for a scheduling product serving 1.2 million requests a day.
- Raised test coverage on the core API from 45% to 82% and removed 30 flaky tests.
- Cut CI build time from 22 to 9 minutes by running jobs in parallel and caching dependencies.
- Shipped a notification service that sent 300,000 messages a day through Kafka.
Software developer co-op
2017Northfield Systems, Kitchener
- Wrote integration tests for an inventory service and caught 14 defects before release.
- Fixed 20 reported bugs, each with a regression test and a reviewed pull request.
Education
BASc Computer Engineering
2018University of Waterloo
Skills
Go, Python, SQL, PostgreSQL, Redis, Kafka, AWS, Docker, Kubernetes, Terraform, REST APIs, CI/CD, System design, Code review