Senior Software Engineer

📋 Description

• • As a Senior Software Engineer on the Firefox Monitor team at Mozilla Corporation, you will be a core contributor to a modern, cloud-native Node.js/TypeScript full-stack application that helps people understand and respond to data breaches by notifying users when their credentials appear in exposed datasets and empowering them to take back control of their online privacy.
• • Day to day, you will lead backend development in Node.js and TypeScript, design and maintain integrations with external data sources like Have I Been Pwned (HIBP), build and maintain event-driven systems using Google Cloud Pub/Sub, own cloud infrastructure on GCP (GKE) and AWS (S3, SES), evolve the data layer including PostgreSQL schema design and query optimization using Knex and Redis caching, work with SRE teams on monitoring and alerting with OpenTelemetry, Sentry, Prometheus, and Grafana, triage and resolve production issues, rotate into a Base Load Engineer (BLE) role for releases and dependency updates, partner with frontend teams on React, TypeScript, Next.js, and SCSS, participate in code reviews and security/privacy reviews, and collaborate across engineering, product, and operations teams to deliver reliable, privacy-first features.
• • You will join the Firefox Monitor Engineering Team, which operates at scale serving millions of users and sits at the intersection of security, data privacy, and product engineering. Mozilla Corporation is a non-profit-backed technology company wholly owned by the Mozilla Foundation, dedicated to making the internet better for people through open-source software like Firefox, with over 225 million monthly users worldwide, and a mission-driven culture free from shareholder pressure.
• • In this role, you will deepen your expertise in cloud-native backend systems, data privacy engineering, and full-stack collaboration while mentoring junior engineers, driving technical excellence, and contributing to impactful privacy-focused products used by millions. You’ll gain hands-on experience with modern observability, infrastructure as code, and secure data integrations in a mission-aligned, inclusive environment that values diversity, equity, and belonging.