Full Stack Blockchain Developer

Description:

We’re building a cross-border payments platform with custody, KYC, ACH funding, stablecoin conversion, and payout integrations (Zero Hash, Plaid, PSPs like Bitso/Coins.ph). You’ll own backend services that connect these pieces, ensure compliance, and keep the ledger accurate. What you’ll do

- Build and maintain microservices in Node.js or Go (ECS Fargate, Lambda).

- Integrate with Zero Hash APIs (custody, KYC, payments, liquidity, transfers).

- Implement Plaid (ACH, external account linking) and Astra/PSPs (card funding, payouts).

- Design and manage databases: DynamoDB, RDS (double-entry ledger), Redis cache.

- Work on authentication & KYC flows with Cognito + Zero Hash SDK.

- Build payment flows (ACH debit, mint/burn stablecoins, PSP payouts).

- Implement monitoring, security, and scaling patterns on AWS (CloudWatch, Secrets Manager, API Gateway, VPC, etc).

What we’re looking for

- 3+ years of backend engineering experience.

- Strong in API design and integrations (REST, webhooks, HMAC signing).

- Comfortable with AWS stack (Lambda, ECS, RDS, DynamoDB, S3, Secrets Manager).

- Experience with databases and ledgers (transactional consistency, double-entry).

- Familiarity with payments/fintech concepts: KYC, ACH, fiat/crypto conversions, PSPs.

- Good understanding of security practices (auth, key management, rate limiting).