[Hiring] Senior Software Engineer @Firstup

Role Description

We're looking for a Senior Full Stack Engineer who thrives at the intersection of craft and scale. You'll design and deliver large-scale, multi-tenant cloud services — with a relentless focus on availability, fault-tolerance, and elegant architecture. You'll set the bar for engineering quality and help elevate those around you.

Responsibilities

• Core Engineering & Ownership: Build and own scalable SaaS applications end-to-end — frontend, backend, and data layers. Write production-grade code that is reliable, readable, efficient, and testable. Raise the bar through thoughtful code reviews and comprehensive documentation.
• System Architecture: Design future-ready architectures and proactively close gaps before they become problems.
• Performance & Reliability: Drive system availability and performance — investigate, analyze, and resolve reliability issues across the stack. Recognize opportunities and advocate for better performance and efficiency of software, systems, and processes across teams.
• Shift Left Testing & Quality: Champion a rigorous 'shift-left' quality culture, embedding comprehensive testing—unit, integration, and contract—early and continuously in the development lifecycle, not as an afterthought.
• AI Integration: Leverage and advocate for AI-assisted tools (e.g., GitHub Copilot, Claude) to accelerate development while maintaining rigorous engineering judgment and accountability for code correctness.
• Leadership: Drive team-wide best practices, conduct quality code reviews, and mentor engineers to elevate overall engineering quality.
• Collaboration (Product & Design): Partner with Product and Design to translate requirements into intuitive UI, making informed technical trade-offs in the face of ambiguity.
• Collaboration (Engineering Standards): Champion engineering best practices across teams and collaborate on solving complex, high-impact problems.

Qualifications

• Bachelor's degree in Computer Science or related field, or equivalent experience.
• 5+ years building reliable, performant applications and microservices in production environments.
• Proven full stack fluency - comfortable across frontend, backend, and the database layer.
• A polyglot mindset — familiarity with Ruby on Rails, TypeScript, Node.js, or React.js is a strong plus.
• Proven full-stack experience across frontend (React.js), backend, and database layers.
• Technical depth in at least one engineering domain: distributed systems, multi-tenant SaaS, application databases, networking, security, serverless, event streaming, or similar.
• A genuine drive to build beautiful, intuitive products with the customer always in focus.
• Innate curiosity — love learning and have a desire to teach and lift others.
• Strong communication skills and openness to collaborative idea-sharing across teams.

Preferred Qualifications

• Familiarity with Ruby (including Ruby on Rails), TypeScript, Node.js, or React.js is a strong plus.

Salary

• $120,000 - $190,000 a year.
• Firstup expects the base salary for this role to be between $120,000-$190,000. The starting rate of pay may vary based on factors including, but not limited to, position offered, location, education, training, and/or experience.

Benefits

• Excellent PTO program.
• Great health benefits.
• Casual and friendly environment.
• Remote work.
• A leadership team who truly believes in your growth – both personally and professionally.