Technical Solutions Engineer

Coinme; San Francisco (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Coinme, the world’s largest network of cryptocurrency kiosks in the United States, seeks a Senior API Documentation and Developer Experience engineer to own the technical experience of our platform. You will shape API docs, guides, and samples to accelerate partner integrations.

This role focuses on building quickstarts, reference architectures, and answering partner questions to ensure smooth go-live for signed partners.

Qualifications

• Hands-on API skills: read logs, debug a broken webhook, reason about auth, and use Postman.
• Strong technical writing that makes complex APIs easy to follow.
• Patience for ambiguity as the stack evolves weekly.
• Comfort using AI tools to speed up documentation and support.

Responsibilities

• Own API and integration docs; keep them current as the stack evolves.
• Build quickstarts, sample code, and reference architectures.
• Answer technical questions from partners during sales and builds.
• Take signed partners live: intake, provisioning, sandbox, webhooks, go-live checks.
• Collaborate with the integration program manager on timelines.
• Learn the stack deeply: CaaS ramps, Sequence wallets, Trails, OMSX, bank rails.
• Build demos and sample apps for BD to showcase products.
• Push learnings back to Product and Engineering about API edge cases.
• Automate onboarding and provisioning; use AI to speed up docs and support.

Skills

API integrations

Technical writing

Developer experience

AI tools usage

Tools

Postman

Datadog

Bruno

Job description

At Coinme, we’re redefining access to financial services in a digital world. By combining the cutting‑edge power of blockchain technology with everyday simplicity, we make digital currencies accessible and usable for all.

As the world's largest network of cryptocurrency kiosks with over 40,000 locations nationwide, we're breaking down barriers to crypto adoption through our seamless mobile app, secure digital wallet, and DeFi integrations. Beyond our consumer offerings, we're also the infrastructure powering the crypto revolution for businesses.

Through our enterprise Crypto-as-a-Service (CaaS) platform, we enable businesses to launch crypto capabilities in weeks, not months. Our modular, API‑first infrastructure provides everything from KYC and payment processing to liquidity and custody solutions—all fully licensed and compliant.

We’re big enough to lead the charge in decentralized finance but small enough that your ideas will make waves. Every role at Coinme contributes to building a financial future where everyone has the tools to thrive. At Coinme, your growth fuels our mission. Together, we RISE.

About The Role

Coinme is part of Polygon Labs, and together we’re building the Open Money Stack: one integration for wallets, compliance, fiat on and off ramps, and settlement. Coinme brings the regulated US fiat layer, built over nearly a decade with money transmitter licenses, 50,000+ retail locations, and over $1B processed. The stack is live and fintechs and financial institutions are integrating it now.

This role owns the technical experience of building on us: our API documentation and integration path, the technical answers partners need during a sales conversation, and getting signed partners from kickoff to production. You'd be defining what good looks like, with the room to set the standard and the mandate to hold it. The bar we're setting is the best developer experience in payments: a competent developer working with an AI coding assistant should be able to integrate us without needing to talk to us at all.

This is a senior individual contributor role with deep technical ownership.

What You'll Do

• Own the API and integration docs. Rewrite what's wrong, fill what's missing, keep it current as the stack changes
• Build the quickstarts, sample code, and reference architectures that get a developer from nothing to a working integration
• Answer technical questions from partners during sales conversations and during builds, and resolve them yourself rather than passing them to engineering
• Take signed partners live: requirements intake, provisioning once KYB and KYC clear, sandbox testing, webhooks, go‑live checks
• Work with the integration program manager on timelines so partners know what's coming and when
• Learn the stack deeply: CaaS ramps, Sequence wallets, Trails, OMSX, bank rails, custodial and non‑custodial flows, virtual accounts, deposit addresses, webhooks
• Build demos and sample apps that BD can use to show what the products do
• Push what you learn back into Product and Engineering. You'll see every rough edge in the API before anyone else does
• Automate the repetitive parts of onboarding and provisioning, and use AI tools to move faster on docs and support

Who You Are

We're open to two different backgrounds here, and you only need one:

You've run API integrations for customers at a payments or fintech company, taking them from kickoff to production. Or you've owned docs, SDKs, or developer support at an API‑first company and want to go deeper into payments.

Either way, you should have:

• Real hands‑on API skills. You can read logs, debug a broken webhook, reason about auth, and work in Postman or Bruno and Datadog. You don't need to be a software engineer, but you do need to solve problems instead of routing them
• Strong technical writing. You can take a messy system and document it so a stranger can follow it
• Patience for ambiguity. The stack changes weekly, the docs are thin, and nobody is going to hand you a plan
• Comfort using AI tools in your daily work, and an eye for how to make our docs work well for developers who are using them too

Payments fundamentals (fund flows, settlement, reconciliation) will help, but we can teach that to the right person.

Nice to have:

crypto or web3 background, especially stablecoins and wallets. Enough coding to build a demo app. Experience with a docs platform like Mintlify. Exposure to KYB and KYC tooling.

Check out our AI Usage Guidelines to understand how we approach AI tools during the hiring process.