AI Researcher - Post-Training (f/m/d)

Sonar; Bochum; Vor Ort; EUR 90.000 - 167.000; Vollzeit

Zusammenfassung

Sonar is seeking an ambitious senior researcher to join our cross-disciplinary team, innovating and developing the next generation of solutions to build enterprise-grade coding agents and models. You will harness Sonar’s deep experience in static analysis and combine it with your expertise in large language model post-training to deliver high-impact, scalable research.

This role is based in Bochum with relocation for the right candidate.

Qualifikationen

• Advanced degree in CS/ML or related field.
• 4+ years industry ML experience.
• Fluency with Python and modern ML frameworks.
• Experience with large language models post-training.

Aufgaben

• Develop and implement advanced products enabling post-training of models for enterprise coding practices.
• Collaborate with researchers, research engineers, MLOps and engineers to design experiments and prototypes.
• Contribute ideas within cross-disciplinary team to drive next-gen coding models.
• Stay up-to-date with LLM and agentic developments; explain concepts to technical and non-technical audiences.

Kenntnisse

Python

Rust

CSharp

C++

JavaScript/TypeScript

Java

English communication

Post-training for LLMs

Policy optimization (GRPO/PPO)

RL frameworks (RLVR)

SFT

Data-centric AI

PEFT

Preference & Safety Alignment

Ausbildung

Master’s or PhD in Computer Science or ML

Tools

ML frameworks (core)

Jobbeschreibung

Sonar is driving the future of agent‑centric software development. As the leader in AI code verification and governance, we solve a critical problem: ensuring that software generated by AI‑assisted developers or autonomous agents is reliable, secure, and maintainable. Integrating seamlessly with Claude Code, Codex, Cursor, GitHub Copilot, Gemini, and Devin, we help over 75% of the Fortune 100 build trusted, reliable, compliant software. Customers who use Sonar are 44% less likely to report an outage due to AI‑generated code. We believe code verification is the critical missing link in the Agent‑Centric Development Cycle (AC/DC). Industry giants like Nvidia, ServiceNow, Booking.com, Goldman Sachs, AstraZeneca, and Ford Motor Company count on us to provide independent, explainable, consistent review and governance of their AI‑generated code via products like:

• SonarQube: The world’s leading AI code review and verification platform.
• SonarQube Foundation Agent: Currently topping the leaderboards for agentic software repair.
• SonarSweep & Sonar Context Augmentation: Providing the enterprise‑grade context and constraints agents need to be truly effective.

Our team operates across global hubs in Austin, Bochum, Dubai, Geneva, London, Singapore, Tokyo, and Washington D.C. We move with a mindset we call CODE:

• Committed to our customers and community.
• Obsessed with quality.
• Deliberate in our decisions.
• Effective as one team.

Position description

At Sonar, we are seeking an ambitious senior researcher to join our cross‑disciplinary team, innovating and developing the next generation of solutions to build enterprise‑grade coding agents and models. You will harness Sonar’s deep experience in static analysis, and combine it with your experience and leading techniques in large language model post‑training. If you are interested in being hands‑on with state‑of‑the‑art research, building practical solutions that deliver high‑impact for customers, and working within a team of innovative researchers and engineers, this role is for you.

What You Will Do

• Outcome Driven Development: Work in a team developing and implementing advanced products that enable customers to post‑train models to power their agentic coding practices. These agents need to generate high‑quality code that meets their enterprise standards and software development best practices.
• Translate Prototypes to Products: Collaborate closely with researchers, research engineers, MLOps and engineers within the team to design hypotheses and experiments, iterate proofs‑of‑concept quickly and develop successful prototypes into cutting‑edge products.
• Subject Matter Expert: You will contribute and discuss ideas within our cross‑disciplinary team, driving towards the next generation of coding model post‑training for enterprises.
• Spearhead Research & Innovation: Stay up‑to‑date with the latest LLM and agentic developments; you are driven by learning and teaching others. You will need to explain complex technical details and concepts to both technical and non‑technical audiences.

Experience And Qualifications

• An advanced academic background (Master’s or PhD) in Computer Science, Machine Learning, or a related quantitative field.
• 4+ years industry experience in machine learning, with a solid understanding of modern software engineering practices and tools.
• Fluency with Python including core ML frameworks, experience with Rust or any of SonarQube’s flagship languages (C#, C++, JS/TS, Java) is a plus.
• Expertise in post‑training of large language models, including:
• Policy optimization algorithms (e.g. GRPO, PPO)
• Verifier‑based RL frameworks (RLVR)
• Supervised fine‑tuning (SFT)
• Data‑centric AI methods, including synthetic data and curation
• Parameter‑efficient fine‑tuning (PEFT)
• Preference and Safety Alignment
• Experience of driving research projects, delivering valuable findings and prototypes, and then converting them into products.
• Excellent communication skills in English and a talent for explaining complex scientific topics clearly and concisely.

Salary range

€90,400 - €166,800 a year

Additional Comments

This role is based in Bochum. We are unable to consider candidates unwilling to be in this location, but we are willing to relocate the right candidate.

In‑office culture

We’re intentional about this. We believe the best teams are built in the room together. Three anchor days — Mondays, Tuesdays, and Thursdays — create the collaboration rhythm that makes a hub office worth having. Candidates need to be genuinely based in the location the role is posted — if that's not where you are today, we’re happy to support relocation for the right person.

We value diversity, equity, and inclusion

At Sonar, we believe that our diversity is our strength. We are a global company that values and respects different backgrounds, perspectives, and cultures. We are committed to fostering a diverse and inclusive work environment where everyone feels valued and empowered to contribute their best. We are proud to be an equal opportunity employer and welcome all qualified applicants, regardless of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.

If you need any accommodation, please reach out to us at [email protected].

All offers of employment at Sonar are contingent upon the results of a comprehensive background check and reference verification conducted before the start date.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.