Senior Software Engineer - LLM Tooling & Code Modernization

Bentley Systems; Dublin; Hybrid; EUR 120,000 - 160,000; Full time

Job summary

Bentley Systems is seeking a Senior Software Developer for LLM Tooling & Code Modernization in a hybrid Dublin role. You will shape how large engineering software systems are transformed with autonomous, multi-agent tooling and careful verification.

You will own end-to-end modernization efforts, build pipelines for code understanding, migration planning, and validation, and collaborate across teams to deliver reliable, maintainable results.

Qualifications

• Strong software development experience with ownership of production systems and complex existing codebases.
• Demonstrated self-directed delivery: defined and solved underspecified problems without step-by-step supervision.
• Hands-on LLM or coding-agent experience beyond code completion, with concrete examples of useful automation.
• Experience building developer tools, pipelines, or integrations that multiply engineering output.
• Ability to decompose large problems, delegate parallel tasks, and integrate results against measurable acceptance criteria.
• Strong testing, debugging, architecture, performance, and failure-analysis fundamentals; judgment about when human intervention is necessary.
• Entrepreneurial ownership: prioritize valuable work, make pragmatic tradeoffs, remove obstacles, and follow through to adoption.
• Ability to learn unfamiliar tools quickly, adapt workflows as capabilities evolve, and communicate clearly across teams. Production work, internal tools, open-source contributions, and substantial personal projects all count. Show what you built, what it automated, and how you established that it worked - not just which AI tools you used.

Responsibilities

• Identify modernization opportunities and drive them from discovery to delivery, aligning priorities with partner teams.
• Build LLM-powered pipelines for code understanding, migration planning, large-scale refactoring, and validation.
• Run multiple agent-driven workstreams across projects concurrently, managing context, dependencies, failures, and integration.
• Connect agents to source code, compilers, build systems, tests, and diagnostics.
• Automate change/test/diagnose/correct loops, with clear stopping conditions and targeted human review.
• Divide migrations into independently verifiable units, preserving behavior and numerical equivalence where required.
• Replace recurring manual work with reusable tools, including automation that reduces your own supervision burden.
• Evaluate and adopt emerging tools quickly when they improve quality, throughput, reliability, or cost.
• Deliver integrated code, documented workflows, and a practical handover to product teams.

Skills

Autonomous delivery

Multi-agent orchestration

Developer tooling

Problem decomposition

Testing and debugging

Tools

Rust

C++

C

Fortran

LLM tooling

CI/CD tooling

Job description

Bentley Systems is seeking a Senior Software Developer for LLM Tooling & Code Modernization in a hybrid Dublin role. You will shape how large engineering software systems are transformed with autonomous, multi-agent tooling and careful verification.

You will own end-to-end modernization efforts, build pipelines for code understanding, migration planning, and validation, and collaborate across teams to deliver reliable, maintainable results.