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Johnson Nifemi

@johnsonnifemi1

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I build agentic financial products and market-data systems with Rust, TypeScript, Python, and Go.

Nigeria

Message

What I'm looking for

I'm looking to build agentic systems and data-intensive financial products, with ownership across full-stack product engineering, market-data infrastructure, and AI automation.

I'm building Tradstry, an AI-powered trading journal with broker imports, performance and risk analytics, market data, rich journaling, and an assistant for trade review.

I architected Tradstry across a Rust Actix Web GraphQL/REST backend, Next.js and TypeScript clients, and a Go brokerage service, integrating PostgreSQL, Turso, Qdrant, Docker, CI/CD, and Vercel.

At DeepVue, I built MCP-enabled workflows that turn natural-language screening and market-monitoring requests into scheduled research automations. I also developed watchlist intelligence for market news, material-development summaries, and timed research digests.

As a finance-query contributor, I've landed eight upstream PRs spanning 250+ typed endpoints, provider tests, HTTP and caching improvements, and backtesting optimizations. I'm also building Simmly, a prepaid food-drop marketplace with checkout, ledger, fulfillment, and operational workflows across an Expo app and Rust API/worker.

Experience

Work history, roles, and key accomplishments

Current

Full-Stack Product Engineer

Current

Simmly

Jul 2026 - Present (2 months)

Building a mobile marketplace for prepaid food drops, including platform checkout, ledger, fulfillment, and operational workflows across an Expo app and Rust API/worker.

Rust Expo React Native APIs Worker Check Out Ledgers Fulfillment

Current

Open-Source Contributor

Current

finance-query

Sep 2025 - Present (1 year)

Landed eight upstream PRs including 250+ typed endpoints across Alpha Vantage, Polygon.io, and FMP with 90+ provider tests. Optimized shared HTTP sessions, caching, parsing, and backtesting hot paths.

Rust HTTP Caching Parsing Backtesting Alpha Vantage API Polygon API Financial Modeling Prep Testing

Current

Founder & Full-Stack Engineer

Current

Tradstry

May 2025 - Present (1 year 4 months)

Building an AI-powered trading journal with broker imports, performance analytics, and trade review assistant. Architected the product across Rust Actix Web backend, Next.js/TypeScript clients, and Go brokerage service.

Rust Actix Web GraphQL REST Next.js TypeScript Go PostgreSQL Turso Qdrant Docker CI CD Vercel

Full-Stack Engineer, AI Team

DeepVue

Mar 2026 - Aug 2026 (5 months)

Built MCP-enabled AI workflows for natural language screening and market monitoring. Developed watchlist intelligence and connected agent tools to screening, watchlist, market-data, and notification flows.

MCP AI Workflows Natural Language Processing Market Data Automation TypeScript Python Rust