Senior Fullstack Engineer (ARG based only)
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Job Description & Responsibilities
About Double
Bookkeepers today are stuck working in excel spreadsheets and homegrown project management solutions to support their clients. Double is on a mission to change that.
With our all-in-one tool, bookkeepers can manage their work, communicate with clients, catch hard-to-find errors, and deliver reports to help their small business customers make smarter strategic decisions.
Founded in 2021, Double has raised $12M in funding, backed by leading tech investors like Y Combinator and founders at top startups like Lattice, Front, Superhuman, Plaid, and more. Double currently helps thousands of bookkeepers and accountants manage the books for startups and small businesses across the US.
We're growing fast, and we're looking for a Senior Full Stack Engineer to accelerate our product and help our customers better serve their small business clients.
Our team
https://getjensen.notion.site/About-our-team-4bbfdf46f6834d42879a96495ccf7242
What You'll Do
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Ship software to prod on a daily basis with coding agents
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Influence UX through product engineering
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Collaborate with a high performing EPD team
Who You Are
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Have a track record of shipping systems that solved a hard problem, not just shipped on time — e.g. you built the thing that made your team 5x faster, or the internal tool nobody thought was possible
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Operate with high agency: you identify what needs to be done and drive it forward without waiting to be told to
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Have found yourself wondering "why isn't this moving faster?" in previous roles — and then have done something about it
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4+ years of demonstrable experience architecting and developing applications with Node
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Demonstrable experience writing type-safe code with TypeScript
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Strong ES6 Experience
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Experience using agents to ship to production
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Experience building applications with React and Node
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Experience with TypeORM is a plus
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Experience with TanStack Query is a plus
Stack
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Front-end: React + Redux Toolkit/React Query (Typescript)
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Back-end: Node.js + Express (Typescript), TypeORM, Postgres
Benefits
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Competitive pay and equity
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Unlimited PTO
Double provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability, genetics, sexual orientation, gender identity, or gender expression. We are committed to a diverse and inclusive workforce and welcome people from all backgrounds, experiences, perspectives, and abilities.
Ready to make an impact?
Applications are reviewed directly by Double.
Crack the Technical Interview for Senior Fullstack Engineer (ARG based only)
Core Engineering Concepts Interviewers Will Test:
- Database Indexing & Query Plans: Explain B-Tree indexes, composite index ordering, and how unindexed foreign keys lead to full table scans.
- Cache Invalidation & Redis Patterns: Differentiate between Cache-Aside, Write-Through, and handle Cache Stampedes with distributed locks (Redlock).
- API Idempotency & Concurrency: How to implement idempotency keys for payment/checkout endpoints using unique database constraints and Redis TTL tokens.
- Rate Limiting Algorithms: Token Bucket vs Leaky Bucket vs Sliding Window Log implementation trade-offs at scale.