Open to opportunities

Ruyonga Dan

@ruyongadan

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Senior full-stack engineer driving scalable systems, team leadership, and digital transformation.

Japan

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What I'm looking for

I seek roles where I can lead engineering teams to build scalable, secure systems, drive digital transformation, mentor engineers, and apply AI/ML to product problems in a collaborative, growth‑oriented culture.

I am a Senior Full Stack Software Engineer with 7+ years building scalable solutions across healthcare, fintech, and logistics, with proven experience in system architecture, API development, and engineering leadership. I have led teams of 8+ engineers, managed transaction processing exceeding $230M, and delivered platforms serving over 1M users.

I drive digital transformation through pragmatic technical design and collaborative leadership, having built startups and enterprise systems using Elixir/Phoenix, Node.js, Python/Django, and Vue.js. My work includes secure REST APIs, cross‑platform integrations, cloud deployments, and AI/ML experiments, and I focus on mentoring teams, improving delivery processes, and aligning engineering outcomes with business goals.

Experience

Work history, roles, and key accomplishments

Co-Founder & Tech Lead

Teheca Limited

Jan 2016 - Jan 2024 (8 years)

Built a healthcare technology startup serving 2,000+ clients via 300+ nurses; led a 5-person engineering team, secured $100,000 in seed funding, and ran a $50,000 research project on smart community malaria interventions.

Vue.Js Elixir Product Development Fundraising Research Management Mobile Apps Stakeholder Engagement

Engineering Manager

Bamboo Technologies

Sep 2020 - Oct 2023 (3 years 1 month)

Led engineering transformation of a fintech platform processing $230M+ in transactions; managed an 8-engineer Elixir team, onboarded 4 enterprise clients and 3,000+ users, and delivered integrations that improved productivity by 30%.

Elixir Phoenix REST APIs Team Leadership AWS CI CD

Senior Full Stack Developer

Guinness Transporters

Oct 2018 - Aug 2020 (1 year 10 months)

Developed platform infrastructure supporting 20,000 drivers and 1M users, built Elixir/Phoenix APIs handling 100,000+ daily transactions, and led a legacy migration that improved efficiency by 40%.

Elixir Phoenix Vue.Js PostgreSQL AWS API Design Performance Optimization Swagger

Education

Degrees, certifications, and relevant coursework

Tokyo International University

Master of Science, Digital Business & Innovation

2023 - 2025

Activities and societies: JICA African Business Education Initiative scholarship (full funding); thesis research and projects in AI-driven information access.

Master of Science in Digital Business & Innovation with coursework in AI & Intelligent Product Development, Digital Business Strategy, and Innovation Management; thesis on Context-Sensitive Search Using RAG for Maternal Health Information Access.