Senior Backend Engineer API Job at 0x

Senior Backend Engineer API

0x

Location:
United States

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

95000.00 - 230000.00 USD / Year

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Job Description:

At 0x, our mission is to 'Create a Tokenized World Where All Forms of Value Can Flow Freely'. We deliver this to web3 builders with a delightfully simple suite of developer APIs that provide faster trading, better prices, and superior user experience. Matcha is a DEX aggregator, built by 0x. With over 5 million tokens indexed across 9 blockchains, the decentralized exchange provides aggregated liquidity from +100 sources and the most efficient trade execution through smart routing. Matcha offers swaps, limit orders and cross chain trades, having enabled over $62B volume and 3.5M+ trades as the first consumer-facing product by the 0x team. 0x platform is developers' one-stop shop to build financial products on crypto rails. 0x empowers hundreds of teams and developers with essential web3 tools to enable faster trading, better prices and superior UX.

Job Responsibility:

Be an individual contributor on projects as well as lead technical projects of moderate to high complexity
Offer valuable insights as a peer when reviewing designs and performing code reviews
Create high quality, secure, clean code
Improve the way we build and deliver software
Consistently ship
Coach and mentor other engineers and generally up-level the team
Empathize with our customers and users

Requirements:

7+ years of experience solving complex distributed computing problems
Fluent in TypeScript/JavaScript - you can confidently write and debug APIs in Node/Express without relying on type-casting hacks or constant lookup
Experienced with designing and building systems that include: Relational or Key-Value datastores
Distributed, event-driven architectures (Kafka, queues, streams)
Cloud-based deployment (preferably AWS)
External-facing REST/HTTP APIs
Monitoring dashboards (preferably Grafana)
Strong problem-solving and debugging skills - you can isolate issues, reason through errors, and explain your approach clearly
Up to date on emerging trends in modern backend technology solutions (databases, queues, caching, etc.)
Passionate about DeFi and how it can improve people’s lives. You’ve used DeFi apps yourself and care about building better ones

Nice to have:

Experience working with search engines (ElasticSearch, OpenSearch)
Solid understanding of blockchains (especially EVM chains). You know fundamentals like chain IDs (e.g., Ethereum mainnet = 1, Polygon = 137) and how replay protection works
Experience working with JSON-RPC APIs to interact with blockchain nodes for tasks like querying data, sending transactions, or monitoring events
Experience with Web3 libraries (e.g., ethers.js, viem, Web3.js) to build/test blockchain integrations

What we offer:

Comprehensive insurance (medical/dental/vision/life/disability) for U.S.-based employees — 100% of base plan covered for you and dependents
401k and FSA for U.S.-based employees
Monthly mobile phone bill, wellness, and pre-tax transportation expense
Covered mental health benefits (included professional therapy sessions)
A supportive remote environment
Lunch reimbursement for all employees across the globe!
Stipend for your ideal remote / WFH set-up: headphones, and any other work gear you may need
12-week paid parental leave
Great office conveniently located in the SF Financial District for those in the region!
Flexible vacation: Take time when you need it (and we really mean it!)

Additional Information:

Job Posted:
January 05, 2026

Employment Type:

Fulltime

Work Type:

Remote work

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