Senior Fullstack Engineer (Creative & Media Library)

About the role

Smartly is looking for a Senior Fullstack Engineer to join the Rocket team that builds the Media Library, a core component of our creative production tooling used by thousands of advertisers.

Key responsibilities

• Own end‑to‑end vertical slices of the platform, from design to deployment.
• Document services and communicate APIs to internal and external stakeholders.
• Define, design and maintain API contracts for both internal and external consumers.
• Collaborate with UX, product, infrastructure and support teams to deliver high‑quality software.

Required profile

• Minimum 7 years of experience building robust, complex, distributed web applications.
• Strong communication skills in English, both spoken and written.
• Ability to work effectively with multiple stakeholders in a hybrid setting (3 days onsite in Helsinki).
• Motivation to solve customer problems quickly and continuously improve.

Required skills

• React, TypeScript, and shared UI libraries for front‑end development.
• Node.js, TypeScript, PostgreSQL, Kafka for back‑end services.
• Kubernetes orchestration, pnpm, webpack, GitHub Actions for CI/CD.
• Experience with BI tools such as Snowflake, Redash, Grafana is a plus.

What we offer

• Inclusive global culture with 900+ employees across 24 locations.
• Equity options, performance‑based rewards and competitive compensation.
• Healthcare, mental‑health services and generous paid holidays.
• Hybrid work model with the possibility to work abroad up to 30 days per year.