Senior Java Developers

We are hiring 7+ years experienced Senior Java Developers to work on a Java-based real-money gaming platform undergoing a major architectural upgrade.

The core scope includes multi-currency wallet support, FX conversion and rate locking, payment and game aggregator integrations, and admin platform modernisation.

This is not a standard CRUD project. The role requires deep understanding of financial systems, transactional integrity, and audit-grade correctness.

Must-have skills

Java 11+

Spring Boot (deep experience)

Wallet / ledger systems

Payment gateways (Stripe, Adyen, etc.)

Multi-currency payments (Deposit / withdrawal flows)

REST API and Webhook integrations & processing

Multi-currency balance management

FX conversion systems

BigDecimal precision handling

Database schema evolution & migrations

Transaction isolation & locking

Audit trails & reconciliation

Should have

Gaming / betting platforms (High-volume bet simulations)

Regulatory / financial audit experience

Key Responsibilities

1. Wallet & Financial Systems

Design and maintain a multi-currency player wallet

Ensure accurate balance handling using high-precision arithmetic

Implement atomic, thread-safe balance updates

Maintain the wallet as the single source of truth

Design and enforce audit-ready transaction records

2. FX Conversion & Rate Management

Integrate external FX rate providers with caching and fallback

Implement FX rate locking per game round or session

Persist FX rates with all relevant transactions

Ensure deterministic and auditable currency conversions

Handle provider currency limitations safely and consistently

3. Game Provider & Aggregator Integrations

Integrate and maintain multiple game providers and aggregators

Handle wager placement and settlement across mismatched currencies

Validate provider callbacks and settlement data

Ensure idempotent handling of provider events

Map external game rounds to internal wallet transactions

4. Payment Provider Integrations

Integrate 812 payment providers (deposits & withdrawals)

Implement secure webhook handling with retry safety

Handle multi-currency payment flows

Ensure reconciliation between payment providers and wallet balances

Manage failure, rollback, and retry scenarios safely

5. Admin Platform & Configuration Logic

Refactor admin logic (e.g., global rebate configuration)

Support admin panel relabeling and configuration simplification

Ensure backend logic aligns with admin UI changes

Support currency display and configuration consistency

6. Security, Reliability & QA Awareness

Implement secure API integrations and key management

Support SMS and OTP service integrations

Design systems resilient to external API failures

Participate in reconciliation testing and edge-case validation

Prevent double processing, race conditions, and silent balance corruption

7. Documentation & Collaboration

Contribute to API documentation (English)

Maintain clear internal documentation for wallet, FX, and integrations

Communicate risks, assumptions, and edge cases clearly

Work closely with frontend, QA, and product teams

Apply on [HIDDEN TEXT]

Thank you

W3NUTS