Sr Manager, Software Engineering

Flex; Milpitas (CA); On-site; USD 140,000 - 190,000; Full time

Job summary

Flex is seeking a Senior Software Engineer in Milpitas, CA to lead modernization of our custom application landscape. You will analyze legacy systems, identify consolidation opportunities, and rebuild critical apps using modern cloud-native architectures and AI-powered tools.

The role emphasizes reducing technical debt, increasing development velocity, and delivering scalable, maintainable software across the enterprise.

Qualifications

• Bachelor's degree in computer science, Software Engineering, or related field.
• 8+ years of software engineering experience.
• Proven experience modernizing legacy applications and reducing technical debt.
• Strong knowledge of object-oriented design, software architecture patterns, API development, and enterprise application development.

Responsibilities

• Analyze existing custom applications, integrations, and legacy codebases.
• Create application inventories and dependency maps.
• Identify opportunities to consolidate redundant applications, eliminate debt, reduce maintenance costs, and improve scalability.
• Develop modernization roadmaps and migration strategies.
• Collaborate with cybersecurity, infrastructure, and business teams to ensure architecture compliance.

Skills

C#

Java

Python

JavaScript/TypeScript

Education

Bachelor's degree in computer science

Tools

Azure

AWS

Google Cloud

Job description

Flex is the diversified manufacturing partner of choice that helps market-leading brands design, build and deliver innovative products that improve the world. A career at Flex offers the opportunity to make a difference and invest in your growth in a respectful, inclusive, and collaborative environment. If you are excited about a role but don't meet every bullet point, we encourage you to apply and join us to create the extraordinary.

We are seeking a highly capable and hands-on Senior Software Engineer to lead the modernization and simplification of our custom application landscape. This role will be responsible for analyzing legacy applications, identifying opportunities for consolidation and rationalization, and rebuilding critical business applications using modern cloud-native architectures, development frameworks, and AI-powered software engineering tools.

The ideal candidate combines deep software engineering expertise with proficiency in emerging AI-assisted development platforms such as OpenAI Codex, Gemini Code Assist, GitHub Copilot, Microsoft Copilot, Claude Code, Cursor, and similar tools to dramatically accelerate code analysis, documentation, refactoring, testing, and application redevelopment.

This is a transformational role focused on reducing technical debt, improving maintainability, increasing development velocity, and simplifying the enterprise application portfolio.

Key responsibilities

• Analyze existing custom applications, integrations, and legacy codebases.
• Create application inventories and dependency maps.
• Identify opportunities to consolidate redundant applications, eliminate debt, reduce maintenance costs, and improve scalability
• Develop modernization roadmaps and migration strategies

AI-Assisted Software Engineering

• Leverage AI-assisted development platforms such as: Codex, Gemini Code Assist, GitHub Copilot, Microsoft Copilot, Claude Code, Cursor
• Use AI tools to reverse-engineer legacy applications, generate technical documentation, accelerate code refactoring, create test cases and automation. Improve code quality, increase developer productivity.

Application Modernization

• Refactor monolithic legacy applications into modern architectures.
• Design and build cloud-native applications, API first services, event-driven architectures, microservices where appropriate, and modernize user experiences using contemporary web and mobile frameworks.
• Implement reusable development patterns and engineering standards

Architecture & Engineering Excellence

• Establish engineering best practices including: DevSecOps, CI/CD pipelines, automated testing, code quality controls, security by design.
• Ensure solutions meet enterprise architecture standards
• Collaborate with cybersecurity, infrastructure, and business teams

Documentation & Knowledge Management

• Create architecture diagrams and technical documentation.
• Document legacy-to-target-state transformation plans.
• Build reusable engineering assets, accelerators, and coding standards.

What we\'re looking to add to our team

• Bachelor\'s degree in computer science, Software Engineering, or related field.
• 8+ years of software engineering experience.
• Proven experience modernizing legacy applications and reducing technical debt.
• Strong knowledge of object-oriented design, software architecture patterns, API development, integration technologies and enterprise application development.
• Deep experience in one or more languages: C#, Java, Python, JavaScript/TypeScript.
• Experience working with Cloud platforms such as Azure (preferred), AWS, Google Cloud

SS26
CA47
EA42
Flex is an Equal Opportunity Employer and employment selection decisions are based on merit, qualifications, and abilities. We do not discriminate based on: age, race, religion, color, sex, national origin, marital status, sexual orientation, gender identity, veteran status, disability, pregnancy status, or any other status protected by law. We\'re happy to provide reasonable accommodations to those with a disability for assistance in the application process. Please email [e-mail] and we\'ll discuss your specific situation and next steps (NOTE: this email does not accept or consider resumes or applications. This is only for disability assistance. To be considered for a position at Flex, you must complete the application process first).