Senior Software Engineer, Backend & Automation (TypeScript)

Smartly.io; Helsinki; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Hybrid workplace

Healthcare & mental health services

Equity options

Career development opportunities

Job summary

Smartly is seeking a Senior Software Engineer to join Team Autopsy in Helsinki. You will design, build, and maintain backend services and frontend applications powering campaign automation and optimization across media platforms.

You’ll drive architectural decisions, mentor peers, and collaborate with product, design, and other engineering teams to deliver scalable solutions. The role emphasizes strong typing, modern React with TypeScript, cloud-native approaches, and robust testing.

Qualifications

• Strong experience building backend services with TypeScript and Node.js.
• Experience developing modern React applications using TypeScript.
• Solid understanding of distributed systems, APIs, microservice architectures, and cloud-native development practices.
• Experience writing and maintaining automated tests at unit, integration and end-to-end levels.

Responsibilities

• Design, build, and maintain backend services and frontend applications that power campaign automation and optimization features.
• Contribute to technical and architectural decisions that improve scalability, reliability, and developer experience.
• Develop and evolve services such as Triggers, Ad Rotation, Smartly Actions, and Action Router.
• Collaborate with product managers, designers, and engineers across teams to deliver solutions that address customer needs.
• Own projects from planning through implementation, balancing short-term requirements with long-term maintainability.
• Improve system quality through automated testing, monitoring, and continuous improvement of engineering practices.
• Mentor engineers through code reviews, knowledge sharing, and technical collaboration.
• Help shape Smartly’s target architecture by contributing to cross-team initiatives and platform improvements.

Skills

TypeScript

Node.js

React

Python

Tools

Kubernetes

PostgreSQL

Redis

NestJS

Job description

Smartly is seeking a Senior Software Engineer to join Team Autopsy in Helsinki. You will design, build, and maintain backend services and frontend applications powering campaign automation and optimization across media platforms.

You’ll drive architectural decisions, mentor peers, and collaborate with product, design, and other engineering teams to deliver scalable solutions. The role emphasizes strong typing, modern React with TypeScript, cloud-native approaches, and robust testing.