Senior Full-Stack Engineer: Microservices & Cyclone Platform

K-ryhmä; Helsinki; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Culture & sport benefit

Employee benefits (shopping, stores)

Occupational health care

Leisure time accident insurance

Office in Kalasatama, Helsinki

Job summary

K Group’s BHI eCom team seeks an experienced senior full-stack developer to help build the Cyclone platform powering eCom in Finland, Sweden and Norway. You will contribute to the backlog, review peers, and help define the architectural direction while coordinating with stakeholders and supporting the product owner.

The role emphasizes strong frontend (TypeScript/React) and backend (Node.js) skills, secure coding, testing, and opportunities to mentor teammates.

Qualifications

• 5+ years of hands-on software product development experience.
• Strong fundamentals in programming and computer science.
• Solid knowledge of microservices architectures.
• Frontend expertise with TypeScript and React, plus HTML/CSS.
• Experience in designing secure, scalable services and APIs with Node.js.
• Strong SQL skills and ability to optimize queries.
• Experience with unit, integration, and end-to-end testing.
• Hands-on experience integrating generative AI into products or workflows.
• Knowledge of secure coding practices (OWASP Top 10).
• Ability to lead, collaborate and mentor within a team.

Responsibilities

• Contribute to the team backlog and deliver features in a multi-deployment environment.
• Review others' code, lead by example, and improve engineering practices.
• Architecturally steer and align technical direction with stakeholders.
• Balance collaboration with independent work to deliver value.

Skills

5+ years exp

OO fundamentals

Microservices

TypeScript/React

Node.js

SQL

Testing (Mocha/Jest)

AI integration

OWASP Top 10

Team leadership

Education

Engineering degree or equivalent experience

Tools

Docker

GitHub Actions

Kafka

PostgreSQL

Mocha

Jest

Webpack

Job description

K Group’s BHI eCom team seeks an experienced senior full-stack developer to help build the Cyclone platform powering eCom in Finland, Sweden and Norway. You will contribute to the backlog, review peers, and help define the architectural direction while coordinating with stakeholders and supporting the product owner.

The role emphasizes strong frontend (TypeScript/React) and backend (Node.js) skills, secure coding, testing, and opportunities to mentor teammates.