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Callixte Nahimana
Senior Software Engineer specializing in document workflows and API platforms
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About
Backend engineer with experience building queue-driven Python/Flask systems using Celery, Redis/RabbitMQ, and SQLAlchemy/Postgres, including async/non-blocking architectures for concurrency. Also built a patient-facing full-stack app integrating LLMs (OpenAI/Claude) with streaming responses for real-time UX, and previously delivered high-throughput, reliability-critical background workflows at Dropbox (document expiration with batching, retries, and cache/side-effect handling).
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Key Strengths
- Designing pull-based task queues with Celery and broker-backed routing (Redis/RabbitMQ/Kombu)
- Database-level prioritization and query optimization for queue workloads (SQLAlchemy/PostgreSQL)
- Building non-blocking/async backends with connection pooling for concurrency
- Integrating LLMs into production apps via OpenAI/Claude APIs
- Improving UX with streaming LLM responses and multithreaded/asynchronous delivery
- High-throughput background processing with batching, retries/backoff, and integrity guarantees
- Experience shipping reliability-sensitive features at Dropbox (document expiration workflows, side effects like emails/reports/cache invalidation)
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