Blockchain Support Engineer

COMPANY

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.

Founded in 2017, we’ve processed over 78M+ transactions and $140B+ in trading volume from users trading on Matcha, Coinbase Wallet, Robinhood Wallet, Phantom, Rainbow, DefiLlama, MetaMask, Zerion, Zapper, and many more. Our investors include Greylock Partners, Pantera Capital, and Jump Crypto.

When you join 0x, you’ll become part of a veteran team of crypto builders who know the importance of code quality, team cohesion, and a culture of learning.

About this role

Join our Support & Success Engineering team, working at the intersection of customer-facing support and deep technical investigation. You'll partner closely with API customers, product stakeholders, and core engineering teams to solve complex issues related to pricing, transaction flows, and expected behavior on-chain. Your main goal: help clients and internal users get the most out of our DeFi infrastructure, ensuring performance, accuracy, and reliability.

This role is ideal for someone who enjoys bridging customer needs and technical investigation—someone curious, technically strong, AI-savvy, leans into automation, and passionate about DeFi. You’ll bring clarity to complex issues, build tools to scale support, and play a key role in shaping a more reliable, transparent, and inclusive financial ecosystem.

Responsibilities (What you’ll do)

• Act as a technical liaison for API integrators and internal stakeholders—diagnosing user-reported issues like pricing anomalies, swap error messages, and unexpected API behavior
• Investigate EVM and SVM blockchain transactions using tools like Tenderly and tracing tools—replaying flows and identifying root causes
• Develop scripts, tools, or small utilities (in Python or another language) to reproduce issues, automate diagnostics, integrate solutions into our support process, and speed up troubleshooting
• Leverage AI tools (e.g. ChatGPT, Claude, Cursor, various LLMs) to analyze failing transactions, interpret revert messages, generate explanations or remediation steps, and build tools
• Track, prioritize, and follow-up in Pylon (or other customer support tools), Slack and Telegram, with a customer-first approach—ensuring timely updates and resolution alignment
• Collaborate with engineering teams, reviewing code and logs to limit the scope of investigation currently required of product engineers.
• Work with Grafana (LGMT)—build dashboards, query logs, and use tracing toolsto help diagnose issues
• Perform data analysis using SQL, Dune, and Metabase

Requirements (Who you are)

• Deep technical knowledge of Automated Market Makers (AMMs), decentralized exchanges (DEXes), and operating mechanics of Ethereum Virtual Machine (EVM) and Solana Virtual Machine (SVM) blockchains
• Proficient user of blockchain debugging and simulation tools such as Tenderly, transaction tracing frameworks, simulators, etc.
• Competent coder— can reproduce issues through code, automate tasks, build custom tools
• AI fluency—capable of using large language models and AI agents (Claude, Cursor, etc.) to assist in diagnosing transaction reverts and explanatory diagnostics
• Strong debugging mindset—able to explore, read, comprehend codeflows, logs, reverts, and collaborate efficiently with engineering teams
• Customer-centric approach—high responsiveness, smart ticket prioritization, and a drive to ensure customer satisfaction
• Curious and growth-oriented—keen to expand into software engineering over time
• Analytical thinker—proficient with SQL or other query languages; experience with Dune, Metabase, or equivalent analytics platforms
• Observability savvy—familiar with stacks like Grafana, able to build dashboards, sift logs, and use tracing tools to monitor and troubleshoot systems
• Mission-aligned—passionate about DeFi’s potential to create fairer and more accessible financial systems for all

BENEFITS

• 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!)
• Multiple annual in-person team meet-ups around the globe

0x and its associated entities are dedicated to fostering diversity, inclusion, and belonging in its teams and workforce, and are proud to be equal opportunity employers. 0x does not make employment or hiring decisions on the basis of race, color, creed, religion, sex (including those who are pregnant or have given birth), sexual orientation, gender, gender expression or identity, age, disability, medical condition, genetic information, military or veteran status, marital status, pregnancy, citizenship, national origin, immigration or citizenship status, political affiliation, or any other basis that is protected by applicable local, state, or federal laws. This includes not making such decisions based on the status itself, as well as any associations, perceptions, and assumptions made regarding these statuses. 0x will also consider qualified applicants with arrest and conviction records in a way that is consistent with San Francisco’s Fair Chance Ordinance and similar local laws. Our commitment to equal employment opportunity extends to ensuring that all applicants and employees can perform to their fullest potential, including through obtaining reasonable accommodations when necessary.