Senior Full-Stack Architect: React/Node Microservices

Kesko Oyj; Helsinki; On-site; EUR 70,000 - 100,000; Full time

Benefits offered by this job

Culture & sport benefit (ePassi)

Store shopping benefits and staff shop

Occupational health care services

Leisure time accident insurance

Partner benefits: optical stores,住宿/tr

Sports & wellbeing services

Job summary

Kesko Oyj’s BHI eCom team seeks a senior full-stack developer to evolve the Cyclone platform powering K-Rauta, Byggmakker and K-Bygg in Finland. You’ll drive architecture, review code, and mentor peers while shaping engineering practices.

You’ll collaborate in a multinational, agile team, designing scalable services with Node.js and React, ensuring secure, testable code. On-site presence in Kalasatama, Helsinki required weekly; English fluent.

Qualifications

• 5+ years of hands-on software product development experience.
• Strong understanding of core programming concepts and computer science fundamentals.
• Solid knowledge of microservices architectures.
• Proficiency in TypeScript, React and modern frontend technologies (HTML, CSS, browser APIs).
• Experience in designing and building secure and scalable services and APIs with Node.js.
• Solid SQL fundamentals; you are able to design schemas and write efficient queries.
• Knowledge of unit, integration and end-to-end testing and building validation strategies.
• Hands-on experience of integrating generative AI into products or development workflows.
• Secure coding practices and mitigating common risks (e.g. OWASP Top 10).
• Fluent communication in English and cross-functional collaboration.

Responsibilities

• Lead architectural planning and set technical direction for the team.
• Review code, mentor developers, and help strengthen engineering practices.
• Coordinate with stakeholders and support backlog refinement with product owner.

Skills

Full-stack development

TypeScript

React

Node.js

Microservices

SQL

Testing

AI integration

English

Collaboration

Education

Bachelor's degree in IT or related field

Tools

Docker

GitHub Actions

Kafka

PostgreSQL

Mocha

Jest

Webpack

Job description

Kesko Oyj’s BHI eCom team seeks a senior full-stack developer to evolve the Cyclone platform powering K-Rauta, Byggmakker and K-Bygg in Finland. You’ll drive architecture, review code, and mentor peers while shaping engineering practices.

You’ll collaborate in a multinational, agile team, designing scalable services with Node.js and React, ensuring secure, testable code. On-site presence in Kalasatama, Helsinki required weekly; English fluent.