Senior Java Developer

ABOUT THE ROLE & ORGANIZATION ECOSYSTEM:

Antal International has been mandated to hire a strategic Senior Java Backend Developer for a high-volume payment

processor ecosystem (aligning with platform scales similar to BillDesk, NPCI rails, and tier-1 acquiring bank switches). In

this high-impact position, you will lead the design, execution, and modernization of core backend payment platforms

processing millions of critical financial transactions daily. 

KEY CORE RESPONSIBILITIES:

• Enterprise Architecture & Engineering: Lead the end-to-end design and implementation of highly available (99.999%

uptime), fault-tolerant, microservices-based backend platforms and payment routing gateways.

High-Throughput Performance Tuning: Optimize JVM runtime, memory management, garbage collection (ZGC/

Shenandoah), database queries, and async I/O pipelines to support thousands of TPS with sub-200ms processing

budgets.

• Resilience & Distributed Transaction Design: Implement robust distributed system patterns, including Saga

Orchestration/Choreography, Circuit Breakers (Resilience4j), Rate Limiters, Idempotency keys, and Dead Letter Queue

(DLQ) recovery mechanisms.

• Ledger & Financial Integrity: Architect immutable, double-entry ledger platforms and automated real-time

reconciliation systems ensuring 100% auditability and zero data loss.

• Security & Regulatory Governance: Enforce stringent security standards including PCI-DSS tokenization, OWASP

Top 10 mitigations, TLS 1.3 encryption, HSM integrations, and adherence to RBI Payment Aggregator guidelines.

Technical Leadership & Mentorship: Drive code reviews, establish technical roadmaps, define coding standards, and

mentor mid-level backend developers in domain-driven design (DDD) and SOLID principles.

FINTECH & BANKING DOMAIN EXPERTISE (HIGHLY PREFERRED):

Deep domain familiarity with Payment Gateway Switches, Card Networks (Visa, Mastercard, RuPay), UPI Rails,

Dynamic Smart Routing Engine, Merchant Onboarding / Escrow Management, ISO 20022 / ISO 8583

Messaging, Tokenization Vaults, and Automated Bank Settlement/Reconciliation Engine.