Daniel Osei
Senior Software Engineer
- [email protected]
- +1 206 555 0124
- Seattle, Washington
- danielosei.example.com
Summary
Software engineer with seven years of experience building backend services in Go and Python. Owns the payments service at a logistics company, which handles 40 million requests a day at 99.98% availability. Likes small pull requests, clear runbooks and teaching on-call to new engineers.
Experience
Senior Software Engineer, Pierline Logistics
Mar 2022 – Present · Seattle, Washington
- Own the payments service (Go, PostgreSQL, Kafka), which handles 40 million requests a day at 99.98% availability.
- Cut p95 latency of the checkout API from 480 ms to 190 ms by removing N+1 queries and adding a read-through cache.
- Led the move from a shared monolith database to per-service schemas with no downtime, across 14 services.
- Mentor three engineers and run the team's on-call training.
Software Engineer, Tallgrass Health
Jun 2019 – Feb 2022 · Portland, Oregon
- Built the appointment scheduling API in Python and FastAPI, used by 220 clinics.
- Raised test coverage of the billing module from 41% to 86% and cut production defects by half within two quarters.
- Wrote the deployment pipeline in GitHub Actions that took releases from weekly to several times a day.
Education
BS Computer Science, Oregon State University
2015 – 2019 · Corvallis, Oregon
Skills
Go, Python, PostgreSQL, Kafka, AWS, Docker and Kubernetes, REST and gRPC APIs, System design, Observability
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