Senior Software Engineer – Annotation

Senior Software Engineer – Annotation & Evaluation (AI Platform)Paris, France; Sophia Antipolis, FranceAt Datadog, we are building an internal AI platform that empowers our teams to train, evaluate, and deploy models at scale. The Annotation & Evaluation team plays a foundational role in ensuring our models are reliable, safe, and production-ready. We design the infrastructure and tooling for dataset labeling, model benchmarking, trust & safety evaluation, and performance diagnostics across a range of ML and LLM applications.From interactive labeling pipelines to automated evaluation environments, our systems provide the core feedback loop that allows engineers and scientists to measure, compare, and continuously improve AI models. We work at the intersection of applied ML, data engineering, and platform infrastructure.We’re looking for a Senior Software Engineer to help us scale our evaluation systems, develop benchmarking tools, and drive trust & safety observability across Datadog's AI product offerings.At Datadog, we place value in our office culture - the relationships that it builds, the creativity it brings to the table, and the collaboration of being together. We operate as a hybrid workplace to ensure our employees can create a work-life harmony that best fits them.What You’ll Do:Design and build systems that support automated evaluation of AI models, including LLMs and agents, using production-like telemetry and scenarios.Lead efforts to develop benchmark suites, evaluation pipelines, and model comparison tooling with built-in trust & safety metrics.Build and maintain integrations with labeling systems (e.g., Label Studio) and coordinate with external/internal annotation workflows.Collaborate closely with Applied AI and Bits AI teams to enable fast iteration, reproducible experimentation, and interpretable evaluations.Develop data pipelines that feed metrics, results, and alerts into our observability stack to track model behavior at scale.Drive best practices around safe model deployment by building systems for bias checks, hallucination detection, and human-in-the-loop review.Who You Are:You have 6+ years of software engineering experience, including 2+ years working with ML/AI products or platforms.You have experience building backend or data infrastructure systems, especially for model evaluation, benchmarking, or labeling workflows.You’re comfortable working across the stack: from orchestrating large-scale data processing pipelines to building UI integrations for labeling or eval dashboards.You have a solid understanding of ML concepts, including model performance metrics, prompt evaluation, and trust & safety concerns.You’re fluent in Python or Go and familiar with cloud-native development patterns.Bonus points: experience with open-source evaluation frameworks (e.g., lm-eval-harness), vector DBs, or human feedback loops.Datadog values people from all walks of life. We understand not everyone will meet all the above qualifications on day one. That's okay. If you’re passionate about technology and want to grow your skills, we encourage you to apply.Benefits and Growth:New hire stock equity (RSUs) and employee stock purchase plan (ESPP)Continuous professional development, product training, and career pathingIntradepartmental mentor and buddy program for in-house networkingAn inclusive company culture, ability to join our Community Guilds (Datadog employee resource groups)Access to Inclusion Talks, our internal panel discussionsFree, global mental health benefits for employees and dependents age 6+Benefits and Growth listed above may vary based on the country of your employment and the nature of your employment with Datadog.Datadog (NASDAQ: DDOG) is a global SaaS business, delivering a rare combination of growth and profitability. We are on a mission to break down silos and solve complexity in the cloud age by enabling digital transformation, cloud migration, and infrastructure monitoring of our customers’ entire technology stacks. Built by engineers, for engineers, Datadog is used by organizations of all sizes across a wide range of industries. Together, we champion professional development, diversity of thought, innovation, and work excellence to empower continuous growth. Join the pack and become part of a collaborative, pragmatic, and thoughtful people-first community where we solve tough problems, take smart risks, and celebrate one another. Learn more about #DatadogLife on Instagram , LinkedIn, and Datadog Learning Center.Equal Opportunity at Datadog:Datadog is anAffirmative Action andEqual Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more. We also consider qualified applicants regardless of criminal histories, consistent with legal requirements. Here are our Candidate Legal Notices for your reference. #J-18808-Ljbffr