Field CTO – Mainframe Modernization

Blitzy is a Cambridge, MA based AI software development platform on a mission to revolutionize the software development life cycle by autonomously building custom software to unlock the next industrial revolution. We're transforming how enterprises build software, turning enterprise requirements into enterprise grade code with an agentic software development platform that can autonomously execute 80% of the quantum of software development work.

We're backed by multiple tier 1 investors, and have proven success as founders of previous start-ups.

Who we are:

Led by two pioneering co-founders we are one of the fastest growing companies in the U.S., creating our own category of enterprise autonomous software development. We automate thousands of hours of software development for our customers, which includes strong representation within the Fortune 500.

How we work:

• We move Blitzy Fast: Time is both our company’s and our clients’ most precious asset. We move quickly and decisively to innovate internally and deliver exceptional software externally.

• Championship Mindset: We operate like a professional sports team. We win as a team by holding ourselves and each other to high standards, collaborating in-person, and remaining focused on the mission.

• Passion for Invention: We’re pushing the frontier of what’s possible, requiring constant innovation and iteration.

• We Work for the Customer: We focus on delivering outsized value to the customers we work with and expanding those relationships into deep, meaningful partnerships.

Blitzy is looking for an exceptional Field CTO with deep mainframe expertise to help solve one of enterprise technology’s hardest problems: making decades of mission-critical software understandable, transformable, and ultimately capable of continuous evolution.

Mainframes have earned their reputation for extraordinary reliability. Modernizing them responsibly requires much more than translating COBOL. It requires understanding and preserving the intricate relationships among business logic, data, transaction processing, concurrency, recovery, and operational behavior, while removing the architectural constraints that make change so difficult and expensive.

Blitzy already reverse‑engineers and transforms complex enterprise software at extraordinary scale, including mainframe applications. Our platform has demonstrated the ability to understand codebases exceeding 30 million lines in days, and modernization programs are underway at Fortune 500 financial institutions.

Our ambition goes further. We want to progressively turn the hardest challenges of enterprise modernization into automated software capabilities, making each successive transformation faster, safer, and less dependent on scarce specialist expertise.

We are looking for someone who combines the depth of a world‑class mainframe architect with the curiosity and imagination of a builder. Someone who respects why these systems work, understands where conventional modernization approaches fall short, and wants to help invent a fundamentally better way.

Mainframe Architecture and Modernization

• Serve as a senior technical authority on mainframe systems, application and data architectures, transaction processing, and operational resilience.

• Lead the architectural understanding of how application logic, data models, transaction boundaries, batch workloads, and runtime behavior interact across complex mainframe estates, ensuring modernization preserves system‑level correctness rather than merely functional equivalence.

• Work with customers’ most experienced architects to design target‑state architectures that preserve business logic, concurrency, recovery, and operational guarantees.

• Guide…