Senior Software Engineer, Meta

Meta Workspaces is a core product area at Smartly, helping advertisers manage, automate, and scale campaigns on Meta through Smartly. The team builds customer-facing experiences, automation capabilities, and integrations with the Meta Marketing API, enabling customers to access platform capabilities efficiently and operate at scale. As a Senior Software Engineer, you will help design and evolve systems that power high-volume advertising workflows used by customers around the world. You will work across the full stack, own significant technical initiatives, and help shape the architecture of reliable, high-performance systems. You will collaborate closely with product managers, designers, and engineers to deliver features that directly impact how customers manage and automate their advertising operations. What You Will Do • Design, build, and maintain backend services and full-stack product capabilities at the core of Smartly’s Meta Workspaces. • Build and maintain integrations with the Meta Marketing API, enabling customers to access new platform capabilities and manage advertising workflows through Smartly. • Develop and operate systems that process high volumes of advertising operations and data while maintaining strong reliability, performance, and scalability characteristics. • Own high-impact features from product discovery and API design through implementation, testing, rollout, and iteration. • Collaborate with product, design, infrastructure, data, and engineering teams to turn business needs into reliable technical solutions. • Improve the scalability, reliability, performance, and observability of services operating under real production load. • Design robust APIs, service boundaries, and integrations that support complex automation and workflow-driven products. • Explore practical ways to use AI-enabled tools to improve engineering workflows, developer productivity, and the quality of team delivery. • Mentor other engineers and help raise the bar for testing, monitoring, code quality, and operational excellence. What We Are Looking For • Strong experience building and shipping production software as a backend or full-stack engineer. • Professional experience with TypeScript and Node.js. • Practical experience with relational databases, APIs, cloud infrastructure, and distributed systems. • Experience designing, operating, and scaling production services with demanding reliability, performance, and availability requirements. • Ability to make thoughtful technical decisions in ambiguous situations and balance quality, speed, and long-term maintainability. • Experience collaborating across functions and contributing to technical discussions that shape product and engineering outcomes. • Strong written and verbal communication skills in English. • Curiosity about emerging AI capabilities and willingness to explore opportunities to improve products, workflows, and developer productivity through AI. • Ability to work effectively in a hybrid setup, including three days per week in our Helsinki office. Relevant technologies for this team include TypeScript, Node.js, PostgreSQL, React, Playwright, Jotai, Kafka, BullMQ, Kubernetes, distributed tracing and observability tooling, and modern testing frameworks. We don’t expect experience with every technology listed, but we value engineers who enjoy learning new technologies and working across different parts of the stack. 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