Joakim Repomaa

Senior Software Engineer

Senior Full-Stack Engineer with deep expertise in Ruby on Rails backends, React/TypeScript frontends, and GraphQL/REST API design. Experienced in AI integration, third-party API integrations, and analyzing large-scale data systems. Fluent in German, Finnish, and English. Passionate about system architecture, performance optimization, clean code, and pragmatic technical decision-making in fast-paced product environments.

E [email]

L Espoo - Finnland

G github.com/repomaa W joakim.repomaa.com

Experience

Senior Software Engineer

hundertzehn GmbH • Zürich, Schweiz (remote)

2021 — Present

Full-Stack Engineer for MOCO Cloud-ERP-SaaS serving 7'500+ SMEs. Ruby-on-Rails backend, REST/GraphQL APIs, React/TypeScript frontends. Analysis of large datasets, evaluation of new technologies, integration of external APIs, direct customer communication. Leading AI integration including Support Agent and MCP functionality. Key technical figure in SaaS product context ensuring platform stability at 60'000 daily active users.

Ruby on RailsTypeScriptReactPostgreSQLGraphQLREST APIsGrafana

Software Engineer

MESO Digital Services GmbH • Frankfurt, Germany

2014 — 2021

Software solutions for digital communication, IoT platforms, and cloud services. Key projects: Energybox - high-resolution big data IoT platform processing 1 billion+ data points daily with horizontally scalable sensor cloud backend, API, and frontend. HERE Technologies - CMS for CES experience platform showcasing location intelligence. HfG Offenbach - database-driven university website with custom CMS for content management.

CrystalRuby on RailsJavaScriptMongoDBREST APIsIoTBig Data

Education

Bachelor of Science

Applied Computer Science • Wiesbaden, Germany

2010 — 2016

Bachelor thesis: 'Collaborative Content Creation' - a scalable CMS with real-time collaboration, hierarchical caching, and JSON-API using Crystal and Redux