Senior Full-Stack Developer (Payment & E-Wallet Systems)

What We're Looking For

Strong full-stack development experience

with PHP/Laravel and/or Golang, preferably with Fiber or similar frameworks.

Proven experience building and maintaining payment systems, digital wallets, or fintech applications

, beyond basic third-party payment gateway integration.

Strong understanding of

e-wallet architecture and payment transaction lifecycles

, including transaction processing, balance management, transaction history, and payment status handling.

Hands-on experience developing

Money-In and Money-Out systems

, including:

Money-In:

Virtual Accounts (VA), QRIS, Payment Links, bank transfers, payment gateways, and switching integrations.

Money-Out:

Bank transfers, disbursements, PPOB, QRIS, payment gateways, and switching integrations.

Solid understanding of

financial transaction integrity

, including double-entry ledger concepts, idempotency, duplicate transaction prevention, transaction consistency, and failure/reversal handling.

Experience with

payment reconciliation, settlement processes, refunds, and transaction monitoring

.

Strong understanding of RESTful APIs, authentication, authorization, OAuth2, JWT, and secure API integrations.

Experience with relational and/or NoSQL databases, such as MySQL, PostgreSQL, and MongoDB, including query optimization and transaction management.

Familiarity with Redis, Kafka, RabbitMQ, or other message-broker systems for asynchronous processing and event-driven architectures.

Proficiency in frontend technologies, including HTML, CSS, JavaScript, and ReactJS, Svelte, or VanillaJS.

Understanding of secure…