Senior Full-Stack Engineer — Mission-Critical, Client-Facing

NestAI; Helsinki; On-site; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Occupational healthcare

Epassi Flex benefit

Lunch benefit

Regular team lunches

Mac or PC

Holiday allowance

Phone benefit

Job summary

Responsibilities include owning full stack delivery, API integration, and UI development with React/TypeScript, while using AI-assisted workflows to accelerate velocity and maintain security. On-site presence is required in Finland with occasional travel to client sites.

Qualifications

• 5+ years of experience shipping complex web applications and backend services.
• Strong frontend (React/TypeScript) and backend (Node.js, Python, or Go) skills.
• Experience building RESTful APIs, WebSockets, and databases; familiarity with Docker and Kubernetes; deployment pipelines.

Responsibilities

• Own building, customizing, and deploying client web apps, dashboards, and backend services.
• Design and implement robust APIs and backend integrations linking NestOS modules with external systems.
• Create responsive, low-latency decision-support UI with React/TypeScript.
• Leverage AI-assisted tools to accelerate development while maintaining security and reliability.
• Collaborate with customer teams and R&D to translate user needs into scalable features.

Skills

Full Stack

React

TypeScript

Node.js

Python

Go

RESTful APIs

WebSockets

Docker

Kubernetes

CI/CD

Cloud/On-Prem

Security

Tools

Docker

Kubernetes

Job description

Responsibilities include owning full stack delivery, API integration, and UI development with React/TypeScript, while using AI-assisted workflows to accelerate velocity and maintain security. On-site presence is required in Finland with occasional travel to client sites.