Senior Software Engineer – Feature Flags (Rust) (Lisbon)

Requirements

• Experienced backend engineer who enjoys solving ambiguous problems through iteration and pragmatism
• Motivated by a fast-moving, customer-facing product environment with startup-like energy
• Comfortable working across multiple programming languages, with a strong ability to learn new ones quickly
• Proficient in Rust and eager to expand a shared Rust core that powers SDKs and edge components
• Skilled at cross-team collaboration and identifying solutions that balance impact and effort

What You'll Be Doing

• Develop high-performance SDKs across a wide variety of languages and platforms, many of which share a Rust-based core
• Contribute to the evolution of OpenFeature and its surrounding open-source ecosystem
• Design and implement systems to support advanced experimentation models such as mutual exclusion, holdouts, and contextual multi-armed bandits
• Architect global systems for distributing feature flag configurations and ingesting evaluations reliably and at low latency
• Collaborate with cross-functional teams to integrate feature flagging with Datadog’s observability and AI-assisted development products

Perks and Benefits

• Generous and competitive benefits package
• New hire stock equity (RSUs) and employee stock purchase plan
• Continuous career development and pathing opportunities
• Employee-focused best in class onboarding
• Internal mentor and cross-departmental buddy program
• Friendly and inclusive workplace culture