Senior Fullstack Engineer Hybrid Ad Tech Platform

Canaan Partners; Helsinki; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Hybrid work model

Work abroad up to 30 days annually

Job summary

Smartly is seeking a Senior Fullstack Engineer to join our team and shape the future of our multi-channel advertising platform. You’ll work on expanding Smartly into new and existing channels, with opportunities for greenfield integrations or evolving established ones like Pinterest, in a role that combines ownership and impact.

You’ll design systems powering automation for large advertisers, collaborate with partners like Google, Reddit and Spotify, and explore how AI and automation will drive

Qualifications

• Experience building and operating production-grade systems with Node.js and TypeScript.
• Strong frontend experience with React and modern web development.
• Experience designing distributed, event-driven architectures.
• Proven ability to scale data-heavy systems and own projects end-to-end.
• Willingness to work in a hybrid setup from our Helsinki office (3 days/week).

Responsibilities

• Own the design and implementation of platform integrations end-to-end.
• Design and operate distributed, data-intensive systems and microservices at scale.
• Build automation systems that process large volumes of campaign and performance data.
• Develop and evolve client-facing APIs and backend services.
• Drive architectural decisions and contribute to long-term technical direction.
• Work across teams to align on shared patterns and unify channel behavior within the platform.
• Partner closely with product and design to shape solutions, not just implement them.
• Mentor other engineers and raise the bar for engineering quality and practices.

Skills

Production-grade systems

Distributed architectures

System design

Mentoring engineers

Cross-team collaboration

Tools

Node.js

TypeScript

React

PostgreSQL

RabbitMQ

Redis

Kubernetes

Job description

Smartly is seeking a Senior Fullstack Engineer to join our team and shape the future of our multi-channel advertising platform. You’ll work on expanding Smartly into new and existing channels, with opportunities for greenfield integrations or evolving established ones like Pinterest, in a role that combines ownership and impact.

You’ll design systems powering automation for large advertisers, collaborate with partners like Google, Reddit and Spotify, and explore how AI and automation will drive