Senior Java DevelopersW3NUTS • Rajkot, India
Senior Java Developers
W3NUTS • Rajkot, India
11 days ago
Job descriptionGaming / betting platforms (High-volume bet simulations) Regulatory / financial audit experience 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 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 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 Integrate 8–12 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 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 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 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
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
Key Responsibilities
1. Wallet & Financial Systems
2. FX Conversion & Rate Management
3. Game Provider & Aggregator Integrations
4. Payment Provider Integrations
5. Admin Platform & Configuration Logic
6. Security, Reliability & QA Awareness
7. Documentation & Collaboration
Apply on [HIDDEN TEXT]
Thank you
W3NUTS
Skills Required
Spring Boot
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Senior Java Developers • Rajkot, India
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