Senior Software Engineer (ChatGPT Ads)

We’re looking for a Senior Software Engineer to help build and shape Smartly’s new ChatGPT Ads offering, bringing our advertising technology to an exciting and emerging platform. This is a unique opportunity to join the team at an early stage and play a key role in building a new channel experience from the ground up, enabling some of the world’s largest advertisers to explore new ways of reaching and engaging audiences.

Working closely with ChatGPT Ads and cross-functional teams at Smartly, you’ll help establish the technical foundations, develop new product capabilities, and solve complex engineering challenges as we expand our multi-channel advertising platform into this new space. With the project still in its early stages, you’ll have significant influence over the architecture, technical direction, and product decisions that shape the offering.

This is a backend-heavy role focused on building reliable, high-performance services and APIs, with opportunities to contribute across the full stack and explore how AI and automation can improve our products and engineering practices.

Our tech stack

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

What you’ll do

• Play a key role in building Smartly’s OpenAI offering from the ground up, shaping its technical foundations and evolving it into a scalable product.
• Own significant product capabilities end-to-end, from early concepts and customer-facing experiences to the backend services and APIs that power them.
• Contribute across the full stack, building customer-facing functionality and backend services using Node.js, TypeScript, and React.
• Drive technical and architectural decisions, helping define the right solutions, patterns, and foundations for a new product area.
• Design, develop, and operate reliable, high-performance distributed systems that can scale with growing customer needs.
• Build and evolve integrations between Smartly and OpenAI, navigating evolving APIs, platform capabilities, asynchronous operations, and technical constraints.
• Develop and optimize data-intensive services using PostgreSQL and Redis, running on Kubernetes.
• Work closely with OpenAI and partner teams at Smartly to understand platform capabilities, identify opportunities, and translate them into valuable product experiences.
• Partner with product, design, and other engineering teams to explore ideas, understand customer needs, and turn ambiguous requirements into practical solutions.
• Explore opportunities to leverage AI and automation to improve both our products and engineering workflows.
• Help establish engineering best practices for this new area, while mentoring fellow engineers and sharing knowledge across the organization.

What we’re looking for

• 6+ years of experience developing and operating production applications, ideally using TypeScript, Node.js, and React or similar technologies.
• Experience delivering complex product capabilities end-to-end, from frontend development to backend architecture and API design.
• Experience designing distributed systems and working with asynchronous, event-driven architectures at scale.
• Experience building reliable systems and third-party API integrations that handle complex data flows and high volumes of data.
• Ability to navigate ambiguity and take ownership of complex technical challenges, turning early ideas into well-designed solutions and taking them from concept to production.
• Interest and motivation to build something new, influence technical direction, and establish solid engineering foundations in an evolving product area.
• Strong collaboration skills, with experience working closely with engineering, product, and design teams to shape solutions.
• A pragmatic engineering mindset, making thoughtful trade-offs between product needs, technical quality, scalability, and delivery speed.
• Interest in mentoring other engineers, sharing knowledge, and contributing to strong 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.

Apply Now and Build Your Future with Smartly!

Curious what it’s like to work at Smartly? Visit our Careers page to see how we grow, collaborate, and make impact together.

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