CodeNext - Software Engineer (Python)
SonarSource Sàrl is seeking an experienced Python developer to join the CodeNext team in Vernier (GE). The role begins immediately and is a permanent, 100% full‑time position.
Impact
The Sonar Code Next team works at the intersection of Large Language Models (LLMs), static analysis, and programming languages. You will help push the boundaries of automated code quality and security by developing AI‑driven projects.
We develop prototypes grounded in cutting‑edge research, testing innovations across the LLM development lifecycle—from data processing and model training to benchmarking. Our approach leverages supervised fine‑tuning (SFT), direct preference optimization (DPO), reinforcement learning from human feedback (RLHF), and retrieval‑augmented generation (RAG).
Responsibilities
Develop and maintain Python‑based tooling and infrastructure for AI‑driven solutions.
Implement and optimize AI‑focused experiments, creating robust systems for fine‑tuning, RAG, DPO, and RLHF.
Write scalable, production‑quality Python code to support AI workflows, dataset processing, and evaluation frameworks.
Design and maintain benchmarking pipelines to assess LLM performance in generating clean, maintainable code.
Process and refine datasets, ensuring they are structured and optimized for training and evaluation.
Develop integrations between AI systems and static analysis tools to provide AI‑assisted insights for developers.
Collaborate with static‑analysis experts and AI researchers to turn experimental ideas into practical solutions.
Ensure the scalability, reliability, and maintainability of AI tooling as it moves from experiment to production.
Continuously improve development processes via workflow refinement, automation, and tooling for AI‑assisted coding.
Work in a fast‑paced, iterative environment that bridges research‑driven innovation with real‑world software development.
Qualifications & Experience
Proven expertise in Python development and clean, maintainable code.
Solid foundation in software engineering fundamentals (algorithms, testing, CI/CD, best practices).
Deep curiosity about LLMs, static analysis, and multiple programming languages.
Genuine interest in AI‑driven software development and willingness to integrate AI with developer tools.
Pragmatic problem‑solving skills balancing research and production‑ready systems.
Self‑driven mindset and ability to take a task from concept to completion with minimal supervision.
Adaptability and eagerness to learn new technologies and experiment.
Positive attitude, open to feedback, collaborative with diverse teams.
Comfort with complexity and change, navigating uncertainty and iterating quickly.
Confidence to challenge assumptions and engage in constructive discussions.
Bonus: Experience with LLM‑related projects, static analysis, or proficiency in additional languages (TypeScript, Java, C#).
Additional Requirements
Work location 1214 Vernier (GE)
Workload 100%
Employment start Immediately
Employment duration Permanent
Work experience More than 3 years
Education Bachelor’s degree from a university of applied sciences or equivalent
English (Orally) Very good
English (Written) Very good
Application method Online form
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