Joshua Oluwaseun Aminu

Lead Backend Engineer at OluSeun Consulting

Led hands-on backend work and architectural decisions for a cross-platform desk-top email client built in Rust (Tauri) with multi-provider Gmail/IMAP support. Implemented secure credential storage using platform-native keychains and optimized mailbox synchronization for thousands of messages. Delivered Rust training to 50+ students and early-career engineers. Designed and deployed a health-management platform serving students, medical staff, and admins to streamline daily health operations across the organization.

Software Developer - OSS at Fermyon Technologies, Remote

Contributed to Spin (v3.4.0, v3.5.0), improving runtime and developer tooling. Built OpenAI SDK integration supporting multiple LLM providers (including OllaMa). Implemented HTTP/2 streaming support and resolved a recursion bug with potential infinite loops. Enhanced CLI UX and developer experience for OSS tooling.

Lead Rust Developer at His Fold, Lagos (Remote)

Led backend development and architectural decisions using Actix, Redis, and PostgreSQL while mentoring engineers and collaborating with stakeholders. Built real-time audio streaming services (WebSocket → AWS Kinesis), developed Android client with Java and NATS for event-driven notifications, and containerized/deployed services with Docker on DigitalOcean.

Senior Rust Developer at Unibox, Antwerp (Remote)

Implemented multi-threaded Rust systems and cryptographic components for high-volume transaction processing. Integrated RocksDB and Kafka for distributed data handling and contributed to a high-throughput, low-latency backend.

Software Developer at Fermyon Technologies

Contributed to Spin (v3.4.0, v3.5.0), improving runtime and developer tooling. Built OpenAI SDK integration supporting multiple LLM providers (including Ollama). Implemented HTTP/2 streaming support. Resolved recursion bug with potential infinite loop. Improved CLI exit handling and developer experience.

Senior Rust Developer at Unnox

Designed and built modular backend services using Axum, Redis, and PostgreSQL, supporting high-volume transaction processing and reducing deployment complexity. Built real-time audio streaming services (WebSocket → AWS Kinesis). Built the Android client with Java, introducing NATS messaging for event-driven notifications, sync with the back-end. Containerized and deployed services using Docker (DigitalOcean).

Lead, Rust Developer at His Fold

Led backend development and technical architecture decisions using Actix, Redis and PostgreSQL while mentoring engineers and collaborating with stakeholders. Built real-time audio streaming services (WebSocket → AWS Kinesis). Built the Android client with Java, introducing NATS messaging for event-driven notifications, sync with the back-end. Containerized and deployed services using Docker (DigitalOcean).