Senior Software Engineer, Platform & Infrastructure - Spellbook

Spellbook is the most comprehensive AI copilot for transactional lawyers. It works directly inside Microsoft Word to help legal teams draft, review, and negotiate contracts up to 10x faster and with greater precision. Today, more than 4,000 law firms, in-house teams, and solo practitioners rely on Spellbook to simplify their workflows and eliminate everyday contract drudgery.

We are backed by leading investors including Khosla Ventures, Thomson Reuters Ventures, Inovia Capital, The LegalTech Fund, Bling Capital, and Moxxie Ventures. The company recently raised $50 million in Series B funding led by Keith Rabois at Khosla Ventures, bringing total funding to over $80 million.

About the Role

Spellbook is seeking a generalist Platform and Infrastructure Engineer to join our team. In this role, you'll work across our entire technical stack—from infrastructure (AWS, MongoDB, Infrastructure as Code, Datadog, CI/CD) to platform capabilities that enable product development and system reliability. You'll be instrumental in building the technical foundations that enable Spellbook to scale and deliver magical experiences to our customers.

As a Platform and Infrastructure Engineer, you'll be a critical member of our growing engineering team of 20 developers. You'll focus on three key areas:

• Building technology foundations: Own and evolve foundational platform systems (e.g., identity and access, core data models, and internal platform capabilities).
• Maintaining world-class quality: Drive toward 99.5% service levels through improved monitoring, observability, and reliability practices. Establish QA foundations and development best practices.
• Enabling development velocity: Reduce friction in our dev environment and CI/CD pipeline. Introduce productivity metrics and tooling improvements that help our team move with high speed.

Responsibilities

• Infrastructure management and optimization (AWS, MongoDB, Infrastructure as Code)
• Platform capabilities including authentication, authorization, entitlement, and AI inference
• CI/CD pipeline improvements and build tooling
• Worker queue management (BullMQ) and API development (tRPC)
• Developer experience improvements and tooling
• Monitoring and observability setup (Datadog)
• Service reliability and performance optimization

Qualifications

• Exceptional communication skills: Ability to explain and advocate ideas to a diverse audience, from product managers to executive leadership.
• Self-starter and problem-solver: Motivated by curiosity, continuous improvement, and helping others succeed.
• Team player: Eager and able to help fix issues when things break and implement ways to improve team workflows.
• Strong engineering fundamentals: Firm grasp of software development, computer engineering, and distributed systems.
• Comfortable with generalism and ambiguity: Ready to work across the stack and pick up whatever is needed to unblock the team.
• Urgency and prioritization: Ability to embrace fast-paced environments and ruthlessly prioritize for impact.

Required Experience

• Strong experience with cloud infrastructure (AWS preferred)
• Experience with Infrastructure as Code and CI/CD systems
• Proficiency with databases, particularly MongoDB or similar NoSQL databases
• Experience with monitoring and observability tools
• Solid understanding of authentication, authorization, and security best practices
• Experience with Node.js/TypeScript backend systems
• Track record of improving developer productivity and experience

Nice to Haves

• Experience with TypeScript and modern JavaScript build tooling (Vite, esbuild, swc)
• Experience with BullMQ or similar job queue systems
• Experience with tRPC or similar type-safe API frameworks
• Experience working in fast-growing startups or scale-ups

Why Join Spellbook?

• Autonomy & Flexibility: Outcome-focused environment empowering you to determine how to get the job done.
• Comprehensive Health Benefits: Company-paid group benefits for you and your family, plus $1,000 towards mental health support.
• Generous Time Off: Holiday closure and generous leave policies throughout the year.
• Perks & Support: Monthly paid meals, an annual wellness allowance, and parental leave top-ups.
• Equity Ownership: Competitive stock option grants as an early employee.