Joshua Olúwaṣeun Aminu

Senior Software Engineer | Rust| Distributed Systems | Open Source | GMT +1:00

+234 (0) 813 226 6883

[email protected]

SUMMARY

Senior Software Engineer specialising in Rust, distributed systems, and developer infrastructure. Experienced in building high-performance backend services, open-source tooling, AI-powered applications, and cloud-native platforms used in production.

EXPERIENCE

Estuary Business Solution,  Ikoyi, Lagos — Senior Software Developer

July 2026 - Present

  • Lead the architecture and delivery of platform features supporting production fintech products.
  • Mentor a team of three developers through code reviews and engineering best practices.
  • Maintain production systems powering jollof.com and EBSPay.
  • Conducted thorough system audits, identifying critical bugs. Documented issues on GitHub with detailed explanations and suggested fixes, streamlining the issue-tracking process.
  • Diagnosed and resolved failed deployments caused by migration errors.
  • Authored technical specifications and Software Requirements Documents (SRDs) for new product features.

Oluseun Consulting — Lead

December 2025 - June 2026

  • Built EdVela, a modern school management platform focused on administration, finance, health records, and parent engagement.
  • Delivered Rust training sessions to 50+ students and early-career engineers.
  • Designed, developed, and deployed a health management platform serving students, medical staff, and administrators, streamlining daily healthcare operations across the organisation.

Fermyon Technologies, Remote — Software Developer - OSS

July 2025 - September 2025

  • 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

Unbox, Antwerp (Remote) — Senior Rust Developer

November 2023 - November  2024

- Designed and built modular backend services using Axum, Tokio, and PostgreSQL, supporting high-volume transaction processing and reducing deployment complexity.

- Built verification systems with background workers that automated lifecycle management and reduced manual intervention.

- Integrated OpenTelemetry + SigNoz for tracing (payloads, latency, status codes)

- Improved Postgres transaction performance (reduced latency by ~10s)

- Built backend services for interacting with internal LLM systems

HisFold, Lagos (Remote) — Lead, Rust Developer

December 2022 - January 2024

  • 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
  • Containerised and deployed services using Docker (DigitalOcean)

Supra Oracles, California (Remote) — Rust Developer

May 2021 - August 2022

  • Contributed to Layer 1 blockchain infrastructure (Testnet)
  • Implemented BFT consensus components and data propagation via libp2p
  • Built an Oracle POC extracting ETH price data
  • Integrated RocksDB and Kafka for distributed data handling

Gridlock, Bristol (Remote) — Rust Developer

January 2021 - March 2021

  • Developed multi-threaded Rust systems and cryptographic components
  • Contributed to distributed key generation (DKG)

PROJECTS & OPEN-SOURCE CONTRIBUTIONS

PhisherMan — A Real-time AI Email Phishing Detection — Demo

Phiserman is an AI-powered email phishing detection system that boasts sub-150ms latency. To achieve this performance, I fine-tuned a lightweight model and leveraged Rust and Python for development. Additionally, I designed and built a Local Cloud for AI inference during the testing phase, and the documentation is available here. 

RiiMail — Rust, Tauri, SQLite, IMAP, SMTP – Repo

Cross-platform desktop email client in Rust(Tauri) with support for multiple providers, including Gmail, and custom IMAP servers. It uses PhiserMan for its email classification. Implemented secure credential storage using platform-native keychains and optimised synchronisation for mailboxes containing thousands of emails.

Open-sourced the project to demonstrate modern Rust desktop application development.

Others

RPC Agent | Spin | Clickhouse-rs | WifiScanner | LoadBalancer | URL shortener | Simple Audio Stream via WebSocket in Rust 

AI & ENGINEERING TRAINING

AI Engineering Bootcamp (10-week Intensive) — Andela

  • Hands-on training in production AI systems and enterprise use cases
  • Built real-world LLM applications with a focus on scalability and reliability
  • Weekly live sessions with industry engineers.
  • Completed these courses during the bootcamp
  • LLM Engineering: RAG pipelines, embeddings, vector search [Credentials]
  • Fine-tuning models using QLoRA and evaluation against frontier models
  • Built multi-agent systems using LangChain, AutoGen, CrewAI, and LangGraph
  • Developed autonomous workflows (research agents, CV automation, assistants), [Credentials]
  • Production deployment of LLM systems and agent infrastructure [Credentials]

Embedded Rust Training — Ferrous Systems

  • Explored hands-on implementation of the Real-Time Interrupt-driven Concurrency framework (RTIC)
  •  Introduction and hands-on implementation of Board Support Crates (BSC),  Peripheral Access Crates (PAC) and HAL implementations, including embedded-hal traits.
  • Radio packet transmission while tracking the Link Quality Indicator (LQI) metric.
  • Tools used: Nordic's nRF52840-DK and nRF52840-Dongle semiconductors

EDUCATION

University of Benin, Edo State, Nigeria — BSc. Banking and Finance

March 2011 - December 2014

LINKS

GitHub: https://github.com/seun-ja 

LinkedIn: linkedin.com/in/joshuaaminu

Website: https://oluseun.dev 

SKILLS

Rust, TypeScript, Python, NestJS, C++, Kotlin, QLoRA Fine-Tuning, Retrieval Augmented Generation (RAG), CI/CD, Terraform, AWS, DigitalOcean, GCP, Nix, Linux, REST APIs, Distributed Systems, OAuth2, PostgreSQL, ChromaDB, SQLite, RocksDB, Linux, Docker, WebAssembly, GraphQL, NATs, Apache Kafka, RPC, Bash.

CORE COMPETENCIES

Backend Engineering

Rust Development

Distributed Systems

Microservices

System Design

Cloud Infrastructure

PostgreSQL

Event-Driven Architecture

AI Engineering

Observability

Performance Optimization

LANGUAGES

English, Yoruba

INTERESTS & HOBBIES

Chess, Music, Travelling, Football, Computers