Developer III - Software Engineering

Role Description Who we are: At UST, we help the world’s best organizations grow and succeed through transformation. Bringing together the right talent, tools, and ideas, we work with our clients to co-create lasting change. Together, with over 30,000 employees in 30+ countries, we build for boundless impact, touching billions of lives in the process. Visit us at UST.com. Summary UST is looking for a Senior Software Engineer (Java and Spring Boot) to design, build, and operate secure, cloud-native applications and microservices on AWS. The ideal candidate owns technical solutions from architecture and API design through production operation, builds resilient and well-tested integrations, and provides technical guidance to other engineers. The Opportunity Job Description Design, develop, test, deploy, and maintain Java and Spring Boot applications, microservices, and secure REST APIs. You will own solutions from architecture and API design through implementation, deployment, and production operation, and modernize cloud-native applications on AWS to improve scalability, resilience, and operational readiness. You will also integrate with API gateways, identity providers, databases, and partner systems, and lead root-cause analysis when complex issues arise. Key Roles & Responsibilities Design, develop, test, deploy, and maintain Java and Spring Boot applications, microservices, and secure REST APIs. Own technical solutions from architecture and API design through implementation, deployment, and production operation. Build and modernize cloud-native applications on AWS, improving scalability, resilience, maintainability, and operational readiness. Design and implement integrations with API gateways, identity providers, databases, internal platforms, downstream services, and external partners. Apply API security controls, including authentication, authorization, OAuth 2.0, JWT validation, encryption, secrets handling, input validation, and protection of sensitive data. Design maintainable API contracts with appropriate versioning, backward compatibility, idempotency, validation, error handling, and traffic protection. Build fault-tolerant services using resilience patterns such as timeouts, retries with backoff, circuit breakers, bulkheads, rate limiting, graceful degradation, health checks, and failover. Improve software quality through automated unit, integration, component, contract, and performance testing. Strengthen observability using structured logging, metrics, tracing, correlation identifiers, dashboards, service-level indicators, and actionable s. Diagnose complex application and integration issues, lead root-cause analysis, and implement corrective actions that prevent recurring failures. Contribute to CI/CD automation, automated quality controls, vulnerability remediation, and production-readiness activities. Analyze application performance, capacity, and cloud-resource usage, and implement improvements where they provide measurable value. Participate in technical design reviews, code reviews, requirements refinement, estimation, and solution planning. Identify technical debt and recommend practical improvements to architecture, security, resilience, code quality, and developer productivity. Create clear technical documentation covering architecture decisions, API behavior, integrations, operations, and troubleshooting. Collaborate with engineers, architects, product owners, security teams, and platform teams, and provide technical guidance to other engineers. What You Need Required Skills: 8+ years of professional software engineering experience, or comparable experience demonstrating senior-level technical capability. Strong hands-on development experience with modern Java, preferably Java 17 or later. Strong experience developing production applications with Spring Boot and the broader Spring ecosystem. Demonstrated experience designing, building, and operating REST APIs, microservices, and distributed systems in production. Practical experience developing cloud-native and containerized applications on AWS. Strong knowledge of API security, including OAuth 2.0, JWT, authentication, authorization, encryption, secrets handling, input validation, and secure coding practices. Strong API design experience, including contracts, versioning, backward compatibility, idempotency, validation, error handling, and traffic protection. Strong knowledge of software architecture, object-oriented design, design patterns, resilience patterns, clean code, and engineering best practices. Experience designing fault-tolerant systems, including failure isolation, recovery, concurrency, consistency, and service-dependency management. Experience applying resilience patterns such as timeouts, retries, circuit breakers, bulkheads, rate limiting, graceful degradation, health checks, and failover. Experience developing integrations with multiple data sources, partner systems, or third-party platforms. Experience with relational databases, SQL, data modeling, transactions, and database performance considerations. Experience creating automated unit, integration, component, contract, and service-level tests. Experience using Git, Linux or Unix, build automation, CI/CD, dependency management, and debugging tools. Strong production troubleshooting, observability, performance analysis, scalability testing, and root-cause analysis skills. Ability to independently lead complex engineering work from problem definition through production delivery. Ability to evaluate technical trade-offs and communicate recommendations clearly to technical and non-technical stakeholders. Desired Skills Experience with Apigee, AWS API Gateway, or another enterprise API-management platform. Experience deploying and operating services using AWS ECS. Experience with Terraform, Jenkins, or comparable infrastructure and delivery automation tools. Experience with Splunk, Dynatrace, Okta, or comparable observability and identity platforms. Experience modernizing legacy applications or designing highly available, multi-region systems. Experience with event-driven architectures, messaging platforms, or asynchronous processing. Experience with cryptography and secure payload patterns, such as ECDH, ECDSA, HPKE, JWE, digital signatures, or key management. Experience developing software for regulated environments or systems that process sensitive consumer data. Experience developing AI-enabled solutions using large language models, retrieval-augmented generation, intelligent automation, or related technologies. Practical experience using AI-assisted development tools, with the ability to review generated code and validate security, correctness, and engineering quality. Qualification Bachelor’s degree in Computer Science or a related field, or equivalent practical experience. What We Believe We’re proud to embrace the same values that have shaped UST since the beginning. Since day one, we’ve been building enduring relationships and a culture of integrity. And today, it’s those same values that are inspiring us to encourage innovation from everyone, to champion diversity and inclusion, and to place people at the centre of everything we do. Humility: We will listen, learn, be empathetic, and help selflessly in our interactions with everyone. Humanity: Through business, we will better the lives of those less fortunate than ourselves. Integrity: We honour our commitments and act with responsibility in all our relationships. Equal Employment Opportunity Statement UST is an Equal Opportunity Employer. We believe that no one should be discriminated against because of their differences, such as age, disability, ethnicity, gender, gender identity and expression, religion, or sexual orientation. All employment decisions shall be made without regard to age, race, creed, colour, religion, sex, national origin, ancestry, disability status, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, citizenship status, or any other basis protected by federal, state, or local law. UST reserves the right to periodically redefine your roles and responsibilities based on the requirements of the organization and/or your performance. To support and promote the values of UST. Comply with all Company policies and procedures. Skills AWS, Amazon API Gateway, Amazon ECS, Apigee, Authentication and Authorization, CI/CD, Application Security, Axway, Design Patterns, Distributed Systems, Cloud-Native Development Show more Show less