Early Interest - Senior Fullstack Engineer

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

Get a head start on an upcoming Smartly opportunity

We’re building our talent pipeline for this role ahead of its official opening. This is a prospect posting for an upcoming opportunity that we expect to begin actively recruiting for within the next 45 days.

By sharing your profile now, you’ll be among the first candidates considered when the role officially opens. Our recruiting team will prioritize these early profiles for review before moving to the wider applicant pool.

Because the active recruitment process has not started yet, you may not hear from us immediately. Once the role moves into active hiring, we’ll review the prospect pool and contact candidates whose experience aligns with the opportunity.

If this sounds like something you’d be interested in exploring, we’d love to hear from you early.

(See below)

We’re looking for a Senior Fullstack Engineer to join Smartly and help shape the future of our multi-channel advertising platform.

You’ll be working on expanding Smartly into both new and existing advertising channels. Depending on the team, this can mean greenfield development of new integrations or evolving and scaling established ones like Pinterest.

While we can’t share all the details yet, this is a highly strategic area for the company with strong leadership visibility and direct revenue impact. Whether you’re building something new or improving existing integrations, the work goes beyond incremental changes. You’ll be building new capabilities, improving existing ones, and helping shape how different channels are integrated into our platform at scale.

In this role, you’ll design systems that power automation for some of the world’s largest advertisers. You’ll work closely with partners like Google, Reddit and Spotify, building deeply integrated solutions that enable customers to launch, optimize, and iterate campaigns efficiently.

You’ll also have the opportunity to explore how AI and automation shape the future of ad tech, and turn those ideas into production-grade systems.

This role is about ownership and technical influence. You’ll contribute to architectural direction, make trade-offs that balance scalability and product needs, and collaborate across teams to create a unified platform experience across channels. We’re hiring for multiple positions across a range of seniority levels, and we’ll align the role scope and level based on each candidate’s experience during the hiring process.

Our tech stack

• Backend: Node.js, TypeScript
• Frontend: React, TypeScript
• Infrastructure: PostgreSQL, RabbitMQ, Redis, Kubernetes
• Architecture: Distributed systems, event-driven services, large-scale data processing

What you’ll do

• Own the design and implementation of new 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

What we’re looking for

• Strong experience building and operating production-grade systems with Node.js and TypeScript
• Solid frontend experience with React and modern web development practices
• Experience designing distributed systems and working with asynchronous, event-driven architectures
• Proven ability to build scalable systems that handle high data volumes
• Ability to take ownership of complex problems and drive them from concept to production
• Strong collaboration skills and experience working across teams and disciplines
• Interest in mentoring and contributing to team-level engineering practices
• Ability and willingness to work in a hybrid setup from our Helsinki office (3 days per week)

What We Offer You

At Smartly, we offer a place where you can advance your career. Here, you'll find:

An Inclusive Global Culture: Join a team of over 750 Smartlies, representing more than 60 nationalities across 24 locations in 13 countries. We cultivate a culture built on trust, transparency, and open feedback, where diverse perspectives are valued and encouraged.

Global Impact: Contribute to a company making a global impact, directly influencing our customers' success and business growth.

Focus on Wellbeing: We prioritize your health with healthcare packages, mental health services, and a commitment to work-life balance through paid holidays and family leave.

Comprehensive Rewards: Benefit from equity options, performance-based rewards, competitive compensation, and career development opportunities.

Flexible Hybrid Workplace: Experience a hybrid work model, balancing office collaboration with remote work, and the option to work abroad for up to 30 days annually.

About Smartly

Smartly is the AI-powered advertising technology company transforming ad experiences for brands and their consumers. Our comprehensive advertising platform seamlessly integrates the capabilities of media, creative, and intelligence to power more than 800 billion impressions and generate more than 300 billion creatives annually, delivering tangible business outcomes for brands and advertisers.

Smartly is the only company in the industry recognized as a Leader in The Forrester Wave: Creative Advertising Technologies with PwC validating the results it delivers for brands. We manage creative and media for 700+ brands worldwide and $6B in ad spend across the largest media platforms, including Facebook, Google, Instagram, Pinterest, Snap, and TikTok. Our end-to-end technology, unmatched access to media platforms and exceptional customer service help Fortune 500 brands to reach and engage consumers and learn what performs best.Smartly is a multinational and diverse team of 750+ Smartlies from 60+ nationalities, working in 13 countries. Together, we want to create and maintain an inclusive environment where everyone feels respected and heard. Our Diversity, Equity & Inclusion approach is at the heart of it.

Visit Smartly to learn more.

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