Sr Java Developer

Sonata Software North America Inc.; Walnut Creek (CA); On-site; USD 150,000 - 190,000; Full time

Job summary

Sonata Software North America Inc. is seeking a Lead Software Engineer to own technical direction for a large Java enterprise platform with a modern React UI, batch processing, and AWS-hosted deployments.

You will drive design and delivery across a mature codebase while modernizing architecture, cloud operations, and developer experience. You will mentor engineers, set coding standards, lead design reviews, and collaborate with product teams on external integrations, monitoring, and reliability.

Qualifications

• 8+ years of professional software engineering experience.
• 2+ years in a lead/staff/tech-lead role.
• Deep expertise in Java 8+ and enterprise codebases.
• Strong Spring (MVC, Security, Batch, SOAP/REST) and Hibernate/JPA knowledge.

Responsibilities

• Lead end-to-end delivery of features across backend services, APIs, UI, and integrations.
• Architect and review solutions in a large Maven multi-module Java/Spring application.
• Guide evolution of the platform from legacy UI to modern React and APIs.
• Own or partner on AWS deployment and reliability for containerized services.

Skills

Java

Spring Framework

Hibernate/JPA

SQL/MySQL

Maven

Tomcat

AWS

React

Leadership

Tools

ECS/Fargate

CDK

CloudWatch

Terraform

Job description

Sonata Software, with over $1.2 Billion Revenue, is a leading AI-first Modernization Engineering company, powered by our unique PlatformationTM framework. Our 6400+ AI Engineers are helping enterprises transform from systems to intelligent business platforms leveraging partner ecosystem to drive speed, efficiency and growth. Our bouquet of Modernization Engineering Services with AI -first approach cuts across Cloud, Data, AI, Dynamics, Test Automation, and Managed Services.

Sonata’s AI-led modernization is enabled by a powerful suite of proprietary tools and assets. At the core is the Harmoni.AI Enterprise Platform, which includes AgentBridge-a governance and observability framework; Agent Builder-a development toolkit for fungible agents integrated into enterprise systems; and the Agent Marketplace-an internal ecosystem for modular, reusable agents.

Headquartered in Bengaluru, India, Sonata Software has a strong global presence, including key regions US, UK, India, Malaysia, Mexico, Australia, DACH (Germany/Switzerland) & Nordics (Finland). We are a trusted partner of Fortune 500 companies in Banking, Financial Services and Insurance; Healthcare and Lifesciences; Telecom, Media, and Technology; and Retail, Manufacturing and Distribution space.

Deep collaborations with partners like Microsoft, AWS, Salesforce, and Snowflake strengthen our ability to deliver cutting-edge AI solutions. Our 30+years of partnership with Microsoft, and being part of the elite Microsoft Inner Circle, places us among the top 1% of global Microsoft partners. Sonata is now among the first companies to earn the Microsoft Frontier Partner Badge Also; Sonata Software is proud to achieve AWS Premier Tier Status in the AWS Partner Network.

Duration: Long term contract

Experience: 8+ years

In-person interview with client

About the role

We are hiring a Lead Software Engineer to own technical direction for a large multi-module Java enterprise platform with a modern React UI, batch processing, partner integrations, and AWS-hosted containerized deployments.

You will lead design and delivery across a mature codebase while modernizing architecture, cloud operations, and developer experience. Experience building AI agents / LLM-powered workflows is a strong plus.

What you’ll do

• Lead end-to-end delivery of features across backend services, APIs, UI, and integrations
• Architect and review solutions in a large Maven multi-module Java/Spring application
• Guide evolution of the platform: legacy server-rendered UI alongside modern React, APIs, and batch jobs
• Own or partner on AWS deployment and reliability for containerized Tomcat services (ECS, CDK pipelines, secrets, observability)
• Mentor engineers, set coding standards, drive design reviews, and improve CI/CD and release quality
• Partner with product and stakeholders on external integrations.
• Diagnose production issues across application, database, and infrastructure layers; strengthen monitoring and runbooks
• Optionally lead or contribute to AI-agent initiatives that automate workflows, data handling, or developer productivity

Required qualifications

• 8+ years professional software engineering experience; 2+ years in a lead / staff / tech-lead capacity
• Deep expertise in Java (Java 8+; comfort with large enterprise codebases)
• Strong hands-on experience with Spring (MVC, Security, Batch, SOAP/REST), Hibernate/JPA, and relational database modeling
• Solid SQL / MySQL skills: schema design, query tuning, transactional integrity
• Experience with Maven, multi-module builds, and Tomcat (or similar Java app servers)
• Proven AWS experience in production: ideally ECS/Fargate, ECR, ALB, Secrets Manager / SSM, S3, CloudWatch, and IaC (CDK, CloudFormation, or Terraform)
• Experience modernizing or maintaining legacy enterprise systems while delivering incremental improvements safely
• Strong design, debugging, and communication skills; ability to lead without blocking the team

Preferred qualifications

• Observability: Datadog, structured logging, APM, on-call practices
• AI agent building experience (plus): Tool-calling agents, MCP, or workflow automation agents applied to enterprise systems

Why join Sonata Software?

At Sonata, you´ll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what´s possible. To build never seen before solutions to some of the world’s toughest problems. You´ll be challenged, but you will not be alone. You´ll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next.

Sonata Software is an Equal Opportunity Employer encouraging diversity in the workplace. All qualified applicants will receive consideration for employment without regard to race, national origin, gender identity, age, religion, disability, sexual orientation, veteran status, marital status, or any other characteristics protected by law