David Joshua
David Joshua

Backend & Blockchain Developer

Open to offers · Member since 19 Oct 2026
Location
Lagos, Nigeria
Desired salary
Confidential
Work preference
Remote Only / Full Time, Part Time, Contract
Experience level
Mid

About

Professional summary

I am a Backend & Blockchain Developer with over two years of experience building backend systems, AI-driven applications, smart contracts, and full-stack web products.

I work primarily with JavaScript, Python, TypeScript, Solidity, Rust, and Move. My work spans backend development, Web3 engineering, smart contract auditing, data analysis, and local LLM development.

I have built project-specific dashboards, a Python-based smart contract arbitrage bot, and an end-to-end smart contract auditing pipeline that automates contract acquisition, vulnerability analysis, and audit reporting.

I also develop full-stack applications, including e-commerce platforms with order management, payment processing, customer dashboards, responsive interfaces, and backend integrations.

I am experienced in analyzing Polymarket data with Dune Analytics and Python libraries, web scraping, CI/CD practices, and machine learning-related systems.

I am currently working as a freelance Backend and AI Developer while continuing to build solutions involving local LLMs, blockchain automation, and modern web technologies.

Notice period: 2 weeks

Skills

18 capabilities

Tech stack & tools

Working toolkit

Development

Languages & Frameworks

Experience

Career history

Backend & AI Developer Freelance

Built multiple dashboards based on project-specific requirements using JavaScript and Python. Developed a Python-based smart contract arbitrage bot to identify potential arbitrage opportunities.

Built a lightweight vectorizer and tokenizer for a local LLM using TypeScript. Conducted Polymarket data analysis with Dune Analytics and Python libraries, and is developing a one-click wrapper for installing local LLMs based on user PC specifications.

Full-Stack Developer Velora by Beauty

Designed and developed a full-stack e-commerce platform for a beauty brand using modern web development technologies. Implemented order management, payment processing, and a customer dashboard to support the end-to-end shopping experience.

Built responsive user interfaces and integrated backend services to provide a seamless user experience.

Smart Contract Developer & Auditor XEVM Audit

Developed an end-to-end smart contract auditing pipeline using Python and JavaScript, automating workflows from contract acquisition through audit reporting.

Built scripts to analyze smart contract logic, identify potential vulnerabilities, and streamline the audit process. Improved audit efficiency by reducing manual review through automation and structured reporting.

Softwar Eng Tutor tech4Rural

Education

Learning history

University of Medical Sciences

B.Sc, Biochemistry

Bachelor of Science in Biochemistry. Studied at the University of Medical Sciences in Ondo State, Nigeria.

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