• A senior engineer with no prior CT LIMS exposure can navigate the system from your documentation alone, and it holds up under structured review.

• Spec-Driven and Test-Driven Development is simply how you work. Specs and tests precede code, and it shows in the quality of what ships.

• The legacy components you’ve touched are documented, diagrammed in Mermaid and committed to Git. No tribal knowledge, no binary files.

• AI-assisted workflows you’ve helped build are reused across the team, not one-off.

• Reference implementations exist for the riskiest parts of the target architectur e and rests on evidence, not opinion.

• Y ou’re contributing production modernization code within the first 90 days , not still ramping up.

• 7+ years of professional software engineering experience.

• Strong cloud-native engineering fundamentals (Azure preferred; AWS or GCP equivalent acceptable).

• Demonstrated practice with Spec-Driven and Test-Driven Development, clean architecture and domain-driven design.

• Hands-on experience with AI-assisted development tools (Cursor, Claude Code, GitHub Copilot or similar).

• Ability to read, reverse-engineer and reason about an unfamiliar or legacy codebase you did not write.

• Comfortable producing documentation and diagrams as code (Markdown, Mermaid.js) versioned in Git.

• Strong communication . You can explain the “why” to experienced engineers and partner effectively across teams.

• You respectfully challenge your peers, and welcome the opportunity when others challenge you.

• You are flexible, resilient and curious.

• You understand prior art but are compelled to iterate beyond it.

Preferred experience

• Experience reverse-engineering or maintaining systems written in Perl or another long-lived legacy language.

• Background in LIMS, scientific or other regulated and compliance-driven software (EPA reporting, chain-of-custody, lab accreditation).

• Experience with Oracle, and with evaluating database migrations (for example, toward PostgreSQL and or Snowflake ).

• Familiarity with containerization ( Podman or Docker) and hybrid on-prem and cloud deployment patterns.

• Exposure to enterprise integrations such as Workday.

• Familiarity with prompt engineering and AI workflow optimization.

Why this role is compelling

You’re joining at the inflection point of our most important custom system. The archaeology, documentation and reference architecture you produce are what defines subsequent systems . The tools are licensed. The leadership is committed. The standards are set.

This isn’t maintenance and it isn’t a blank page. It’s the rare chance to take deep institutional knowledge locked inside a legacy system and help rebuild it in a modern framework , with specs, tests and modern infrastructure, for every Onterris lab that depends on it. The labs you support protect the air we breathe, the water we drink and the soil that sustains communities. Your code becomes the foundation the rest is built on.