Senior Backend JavaScript Developer - SF

We’re looking for exceptional and experienced Senior Backend JavaScript Developers to join our Unblocker team, with deep expertise in Node.js and building production-grade backend services.

In this role, you will take end-to-end ownership of product and feature development, building SaaS applications and services in a microservices architecture, using modern technologies in a fast-paced and professional environment.

Tech Stack:

Node.js, JavaScript, MongoDB, Kubernetes, Redis (including Redis Streams)

*Hybrid position based in San Francisco*

Responsibilities

• End-to-end feature development, from design and implementation to production rollout and ongoing improvements.
• Build and operate backend services with a strong focus on scalability, reliability, and performance in a microservices environment.
• Participate in system design and architecture planning, and contribute to technical decisions across the team.
• Work with asynchronous, message-driven components using Redis Streams, including debugging, tuning, and ensuring resilient processing.
• Write high-quality, maintainable code with appropriate test coverage; participate actively in code reviews.
• Collaborate effectively with teammates and cross-functional stakeholders to deliver high-impact outcomes.
• Continuously learn, adapt, and stay up-to-date with best practices and evolving technologies.

Requirements

• 5+ years of hands-on software engineering experience, including 3+ years focused on backend JavaScript / Node.js development.
• Proven experience building and maintaining SaaS applications and/or production backend services.
• Experience working in a microservices architecture (service boundaries, APIs, reliability patterns).
• Hands-on experience with MongoDB and Redis (including practical experience with Redis Streams or similar pub/sub/stream processing).
• Familiarity with Kubernetes and containerized deployments.
• Good understanding of system design fundamentals: APIs, data modeling, performance, scalability, and reliability.
• Fast learner, able to work both independently and as a team player.
• Strong written and verbal communication skills.

Nice to Have:

• Experience with AWS and cloud-based production environments.
• Experience with observability tooling (logging/metrics/tracing) and incident response.
• Experience with scraping, browser automation, Playwright, Puppeteer, or Selenium.