0x
Senior Software Engineer, API Products at 0x
0x is hiring a Senior Software Engineer, API Products in Remote. The role details below come from the employer’s posting. You apply on the employer’s own site, and TechJobs360 never charges candidates.
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1. Job details
0x
Senior Software Engineer, API Products
Remote
Not disclosed by employer
See the job description
On the employer’s site
2. Job description from 0x
COMPANY
At 0x https://0x.org/, 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 211M+ transactions and $180B+ 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 the team
Behind every 0x trade is a lot of hard work. We integrate hundreds of liquidity sources, optimize for gas, slippage and latency, split routes and simulate every result to get traders the best possible outcome. The API Products team turns that routing logic into easy-to-integrate APIs that wallets, exchanges, trading apps, bridges and developers around the world rely on.
This team of four built, maintains and continues to evolve our flagship Swap, Gasless and Cross-Chain APIs, which have moved billions in volume. Next, they’re building new products that give developers even more tools for building trading apps.
About the role
We’re hiring a Senior Software Engineer to expand what the API Products team can take on. You’ll lead projects from first idea to production, on new products and on the APIs that are already live, working closely with our product team and some of our biggest customers. This is a hands-on IC role for someone who wants real ownership and works well with little direction. Remote, EU timezones preferred.
What you’ll do
– Build new APIs and trading products, from researching the problem and designing the architecture to shipping the first version.
– Maintain and extend our existing APIs, including support for new chains, bridges and customer-requested features.
– Keep our APIs fast and reliable as traffic grows, and participate in the on-call rotation.
– Investigate failed trades and stuck transfers using logs, traces and onchain data, and resolve the root cause.
– Work with product, legal and GTM, turning business and compliance needs into technical decisions.
– Write design documents for your work and review your teammates’ designs and pull requests.
Who you are
– 6+ years of backend engineering experience, including at least 2 years in DeFi at a trading app, wallet, DEX aggregator, onchain data company or similar.
– Senior or Lead Engineer with a track record of owning complex projects end to end.
– Built and maintained developer-facing APIs.
– Deep onchain knowledge, especially EVM: how transactions work, including calldata, contract interfaces, gas and approvals.
– Strong system design experience for production-scale backend services.
– You’re an AI power user who uses it to multiply your impact as an engineer, yet you don’t let it replace your judgment.
– Clear communicator, comfortable explaining technical tradeoffs to non-engineers.
– Aligned with our core values https://0x.org/post/the-0x-mission-and-values: do the right thing, consistently ship, and focus on long-term impact.
– Able to attend annual in-person team offsites around the globe.
Nice to have
– Experience with cross-chain/bridging, or DEX aggregation.
– Experience with other ecosystems outside of EVM such as Solana.
– Experience with TypeScript and/or Rust, our main languages.
BENEFITS
– The base salary range for this position is USD $150,000 – $230,000 + equity + ZRX tokens + benefits. Within the range, individual pay is determined by job-related skills, experience, location, business needs, and candidate preferences between the different compensation elements.
– 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!)
3. Skills that usually matter in software engineering roles
General guidance from TechJobs360, not part of 0x’s posting. The job description above is what counts for this role.
| Area | What to be comfortable with |
|---|---|
| Languages | Java, Python, Go, C# or C++ |
| Frameworks & tools | A web framework, SQL and NoSQL databases, Git, cloud basics |
| Computer science basics | Data structures, algorithms, complexity |
| Ways of working | Version control, code review, testing, reading other people's code |
4. How to prepare for a Senior Software Engineer, API Products interview
Interview formats differ by company and team, so confirm the rounds with the recruiter. Most hiring loops for roles like this cover:
A recruiter call or an online test. Read the job description twice and be ready to explain how your experience matches it.
Often coding problems on arrays, strings, trees, graphs or dynamic programming, solved while you explain your thinking.
Often design and trade-off questions sized to the role: an API, a component, or a small system.
Answer with the STAR method (Situation, Task, Action, Result). Prepare two or three real stories: a hard problem you solved, a disagreement you handled, and something you learned quickly.
5. Take-home pay example (FY 2026–27, new tax regime)
An example for two common package sizes, not this job’s salary. Under the new tax regime (Section 115BAC) salaried employees get a standard deduction of ₹75,000.
| Component | Example: ₹12 LPA | Example: ₹24 LPA |
|---|---|---|
| Basic salary (40% of CTC) | ₹40,000 / mo | ₹80,000 / mo |
| Employee EPF (12% of basic) | -₹4,800 / mo | -₹9,600 / mo |
| Income tax (TDS) | -₹6,933 / mo | -₹32,450 / mo |
| Professional tax | -₹200 / mo | -₹200 / mo |
| Approx. in-hand | ₹81,344 / mo | ₹1,44,304 / mo |
Work out the take-home pay for your own offer, in either tax regime.
6. Questions and how to apply
How do I apply?
Use the apply button below. It opens 0x’s own application page.
Does TechJobs360 recruit for this job or charge a fee?
No. We list openings from employers’ career sites. 0x runs the hiring, and nobody should ask you to pay to apply.
Is this job still open?
We check listings against the employer’s page every day and take down jobs that have closed.
Should I apply if I don’t match every requirement?
Usually yes, if you meet most of the core requirements and can show you learn quickly. A referral from someone on the team can help your resume get read.
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