Senior AdTech Engineer (Remote, Full-Time) [TH038]

Job description

**About Smart Working** At Smart Working, we believe your job should not only look right on paper but also feel right every day. This isn’t just another remote opportunity — it’s about finding where you truly belong, no matter where you are. From day one, you’re welcomed into a genuine community that values your growth and well-being. Our mission is simple: to break down geographic barriers and connect skilled professionals with outstanding global teams and products for full-time, long-term roles. We help you discover meaningful work with teams that invest in your success, where you’re empowered to grow personally and professionally. Join one of the highest-rated workplaces on Glassdoor and experience what it means to thrive in a truly remote-first world. **About the Role** As a Senior AdTech Engineer, you will take a senior, guiding role in the continued evolution of a proprietary programmatic advertising platform, now on version 3 and live in production. The platform is continuously evolving, with a focus on performance, reliability and proprietary agentic processes for media buying. This is a back-end-heavy software engineering role, estimated at an 80/20 back-end/front-end split. You will own a critical area independently while collaborating day to day with a data scientist and guiding the engineering team. You will work alongside the CTO, combining hands-on engineering with architectural judgement and technical leadership. ### Responsibilities - Build and scale the back-end components and infrastructure behind a programmatic advertising platform, developing low-latency, high-throughput services that process ad requests in milliseconds. - Build proprietary AI agents for buying and distributing media, working closely with the team’s data scientist on content tagging and enrichment of ad requests. - Integrate with third-party AdTech platforms and APIs, including OpenRTB, DSPs and SSPs. - Act as a senior engineer within the team, overseeing work, running code and peer reviews, and guiding other engineers. - Own a critical area independently while collaborating closely with the data scientist and guiding the wider engineering team. - Apply architectural judgement and attention to detail in a real-time bidding environment where milliseconds and correctness matter. - Help shape how agentic processes fit into the platform. - Work flexibly within solid engineering disciplines, including GitOps deployments and a code-review culture. - Take a problem-solving approach to building proprietary technology rather than simply following a specification. - Prioritise careful improvement of a live, performance-critical platform without breaking existing functionality. - Own the design and delivery of services or components end to end. - Guide engineers through code reviews, mentoring and setting technical standards; line management is not required. ## ### Requirements - 5+ years of advanced Node.js back-end engineering experience. - 3+ years of advanced experience building low-latency, high-throughput systems requiring millisecond response times and handling high request volumes. Relevant experience may include fintech, trading, payments, banking platforms, or real-time gaming or betting back-ends. - 1+ year of proficient, hands-on experience building agentic AI for production, including LLM agents and working with a data scientist on models. You must have **built AI agents**, rather than simply used AI tools. - 5+ years of advanced experience building APIs and third-party integrations. - 2+ years of experience conducting code reviews and peer reviews and guiding engineers, or equivalent experience as a senior individual contributor who formally mentors engineers and owns review standards. - 3+ years of advanced TypeScript experience. Strong modern JavaScript experience can be considered as a substitute. - 2+ years of working experience with React. - 2+ years of working experience with Google Cloud Platform (GCP). AWS or Azure experience can be considered as a substitute. - 2+ years of working experience with Kubernetes and Argo CD for GitOps deployments. Kubernetes with Flux or Helm can be considered as a substitute. - Senior Engineer/Architect-level capability with technical leadership experience and the ability to work alongside the CTO. ### Nice to Have - 2+ years of programmatic advertising experience, including OpenRTB, real-time bidding, DSPs and/or SSPs. Strong senior engineers with relevant low-latency systems experience may still be considered, as the domain terminology can be learned. - Experience leading a project and owning the design and delivery of a service or component end to end. - Basic Golang experience. Rust, Java, C++ or another performance-focused language can be considered as an alternative. - 1+ year of working experience with Jenkins for CI/CD. GitHub Actions, GitLab CI or CircleCI can be considered as alternatives. - 1+ year of working experience with Grafana for monitoring. Prometheus, Datadog or New Relic can be considered as alternatives.