Staff software Engineer (API, Microservices, Oauth)- Contract

Key Responsibilities:

Key skills:
Open API, Microservices, Java, Oauth, JWT, Swagger, SQL

Technical Delivery & Systems Analysis

• Own Corporate Banking channel (infinity program and projects) requirements→ solution design → integration → testing → rollout.
• Produce engineering ready specifications:
• API specs (REST/JSON), OpenAPI/Swagger definitions
• Microservices interface contracts, event schemas, callback payloads
• Sequence diagrams, state machines, mapping specs, error models

Define end to end orchestration flows for:

• Pre-Payment initiation, acceptance, expiry, rejection
• Entitlement and Auth Matrix lifecycle events
• Template, Past Payment, Bene Master

Specify robust pre processing logic:

• Customer/account validation
• Entitlement and authorisation checks
• Funds availability
• Limits, thresholds, duplicate suppression
• Idempotency, retry and timeout handling

API & Microservices Architecture

• Define API and microservices designs using existing components
• Payment initiation microservices
• Validation & entitlement services
• Fraud/AML adapters
• Core banking and ledger integration patterns

Integration & Platform Engineering

• Design integration between:
• Payment Hub / RFP Orchestrator
• Payment gateway
• Core banking, ledger, AML, fraud
• Use existing microservices blueprints for:
• Error propagation and code mapping
• Schema validation and transformation
• Event lifecycle management
• Callback patterns and async updates

Quesscorp Singapore Pte. Ltd
Reg No- 199801439D

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This is in partnership with the Employment and Employability Institute Pte Ltd (e2i).

e2i is the empowering network for workers and employers seeking employment and employability solutions. e2i serves as a bridge between workers and employers, connecting with workers to offer job security through job-matching, career guidance and skills upgrading services, and partnering employers to address their manpower needs through recruitment, training, and job redesign solutions. e2i is a tripartite initiative of the National Trades Union Congress set up to support nation-wide manpower and skills upgrading initiatives. By applying for this role, you consent to Quesscorp Singapore's PDPA and e2i's PDPA