We are seeking a Solution Architect to design and lead a central email gateway. It will sit between the client's commerce platform, its middleware (enterprise service bus) and a new email service provider, and will carry all business-critical transactional email, such as order, shipping, refund and account notifications. The gateway offers two integration models: • a pass-through API for systems that are ready to use the new provider directly • a backward-compatible API that mimics the legacy provider, so existing systems only need to change an endpoint The Architect will own the AWS target architecture, the versioned API contracts, a configuration-driven mapping model, and the resilience design needed to make sure no email is lost or sent twice. The role leads a small cross-functional team on a short build window, drives technical decisions with the client's architects, and owns cutover readiness and early-life support. Architecture & Design • Own the AWS target architecture across edge, API Gateway, private networking, load-balancing and ECS Fargate integration, containerized compute, eventing, audit and data flows • Define versioned OpenAPI contracts for the pass-through and backward-compatible APIs • Design a configuration-driven mapping engine for campaign, field and error-code translation • Design resilience patterns: timeouts, retries with backoff, circuit breaker, idempotency and dead-letter queue (DLQ) handling • Design the Security & Observability Framework Technical Leadership • Lead discovery and capture existing integration contracts from live traffic • Set engineering standards and review all code, including AI-generated code • Guide developers, DevOps and QA on design, testability and performance • Establish AI-assisted application-building workflows using AI approved Stakeholder & Delivery • Present options and recommendations to the client's architecture and platform teams • Coordinate the ecommerce, middleware and email provider teams through integration and SIT • Own cutover planning, go/no-go criteria and early-life support Security & Compliance • Ensure OAuth2 machine-to-machine authentication, encryption, least-privilege IAM and PII masking • Align audit retention and the data purge approach with GDPR/CCPA requirements Required Skills & Competencies • Strong solution architecture experience on AWS: API Gateway, ECS/Fargate, SQS, EventBridge, Secrets Manager, IAM and KMS • Configuration management using AppConfig or DynamoDB; observability with CloudWatch and OpenTelemetry/ADOT or X-Ray; CI/CD and infrastructure-as-code design. • Proven design of API gateways or enterprise integration layers for high-volume transactional systems • Hands-on with Node.js/TypeScript or Java/Spring Boot microservices • Strong grasp of resilience patterns, idempotency and event-driven design • OpenAPI-first design and contract testing practices • Excellent stakeholder communication and technical leadership Good-to-Have • Exposure to email service provider platforms; retail transactional email, ESB/middleware platforms • Fastify; Akamai WAF; Terraform or AWS CDK; OpenSearch/ELK-based operational search. • AWS Solutions Architect – Professional certification Qualifications • 12+ years of relevant software engineering experience with solution architecture and hands-on technical leadership. • B.E./B.Tech/MCA or equivalent • AWS architecture certification is desirable.