Legacy Modernization Engineer

Who You’ll Work With

As a Senior Consultant or Principal at Slalom, you will help clients accelerate large scale technology transformation by turning decades-old mainframe code into agile, cloud-native systems. This role blends deep systems understanding of z/OS with modern cloud, DevOps, and AI-assisted engineering practices. You’ll work across multiple domains, from code analysis and business-logic extraction to automated refactoring and re-platforming, helping enterprises transition mission-critical workloads to hyperscaler infrastructure.

What You’ll Do

• Understand, extract and document business logic from mainframe applications.
• Modernize and refactor legacy code using automated transformation tools and AI coding agents.
• Reimagine monolithic systems into cloud-native microservices and event-driven architectures.
• Build, containerize, and deploy workloads to AWS (or other hyper scaler platforms).
• Prototype modernization accelerators and proof-of-concepts using LLMs, code analysis tools, and custom pipelines.
• Collaborate with architects, operators, and data engineers to ensure secure and efficient modernization patterns.

What You’ll Bring

• Hands-on experience developing or operating on IBM mainframes (z/OS).
• Proficiency in one or more mainframe languages: COBOL, PL/I, HLASM, JCL, etc.
• Knowledge of z/OS fundamentals: CICS, DB2, VSAM, batch scheduling, system utilities.
• Experience deploying workloads to a major cloud provider (AWS, Azure, or GCP).
• Experience leveraging LLMs and coding agents in software development workflows.
• Strong prototyping and POC development capability in dynamic environments.
• Thrives in fast-moving, collaborative and entrepreneurial teams.
• Preferred Qualifications
• Familiarity with Code-as-Data and structured intermediate representation (IR) concepts.
• Experience parsing or analyzing source grammars (ANTLR4, Tree-Sitter, recursive descent, etc.).
• Experience with modernization frameworks such as AWS Blu Age or AWS Mainframe Modernization (Transform for z/OS).
• Experience with CI/CD pipelines, IaC (CloudFormation/Terraform), and container orchestration (Kubernetes/OpenShift).
• Understanding of legacy data integration (DB2, VSAM, IMS) with modern cloud data stores.
• Experience designing automated test harnesses for workload equivalence validation.
• Awareness of enterprise security and IAM frameworks (RACF, IAM roles, encryption-at-rest/in-transit).
• Experience fine-tuning or prompting code-centric LLMs (e.g., Amazon Q Developer, Bedrock, Claude) for code translation, documentation, or rule extraction.
• Understanding of retrieval-augmented generation (RAG) patterns, vector databases, and agentic orchestration for code analysis pipelines.
• Master's degree in computer science or software engineering.
• Consulting or systems-integration experience.

About Us

Slalom is a fiercely human business and technology consulting company that leads with outcomes to bring more value, in all ways, always. From strategy through delivery, our agile teams across 52 offices in 12 countries collaborate with clients to bring powerful customer experiences, innovative ways of working, and new products and services to life. We are trusted by leaders across the Global 1000, many successful enterprise and mid-market companies, and 500+ public sector organizations to improve operations, drive growth, and create value. At Slalom, we believe that together, we can move faster, dream bigger, and build better tomorrows for all.

Compensation And Benefits

Slalom prides itself on helping team members thrive in their work and life. As a result, Slalom is proud to invest in benefits that include meaningful time off and paid holidays, parental leave, 401(k) with a match, a range of choices for highly subsidized health, dental, & vision coverage, adoption and fertility assistance, and short/long-term disability. We also offer yearly $350 reimbursement account for any well-being-related expenses, as well as discounted home, auto, and pet insurance.

East Bay, San Francisco, Silicon Valley

Slalom is committed to fair and equitable compensation practices. For this role, we are hiring at the following levels and salary ranges:

• Senior Consultant: $131,000-$203,000
• Principal: $145,000-$225,000

San Diego, Los Angeles, Orange County, Seattle, Houston, New Jersey, New York City, Westchester, Boston, Washington DC:

• Senior Consultant: $120,000-$186,000
• Principal: $133,000-$206,000

All other locations:

• Senior Consultant: $110,000-$171,000
• Principal: $122,000-$189,000

We will accept applicants until 12/15 date, or until the position is filled

We are committed to pay transparency and compliance with applicable laws. If you have questions or concerns about the pay range or other compensation information in this posting, please contact us at: [email protected].

EEO and Accommodations

Slalom is an equal opportunity employer and is committed to attracting, developing and retaining highly qualified talent who empower our innovative teams through unique perspectives and experiences. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability status, protected veterans’ status, or any other characteristic protected by federal, state, or local laws. Slalom will also consider qualified applications with criminal histories, consistent with legal requirements. Slalom welcomes and encourages applications from individuals with disabilities. Reasonable accommodations are available for candidates during all aspects of the selection process. Please advise the talent acquisition team or contact [email protected] if you require accommodations during the interview process.