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Lead Research Engineer / Research Scientist - Post-Training, Reinforcement Learning & Training Systems

Giotto.ai -
Lausanne, VD

Postuler rapidement

Détails de l'emploi

100% | Temps de travail : 90-100%
Il y a 6 heures

Qualifications

Niveau Doctorat
Multilingue
Docker
GitLab
Python
Debugging

Description complète du poste

Giotto.ai is a Switzerland-based AI company building intelligence systems for Switzerland and Europe.
Our mission is to enable governments and enterprises to retain control over the AI systems they use without compromising access to advanced reasoning capabilities. Giotto combines portable, configurable models with an AI operating system, integrating open and proprietary weights, datasets, tools, and deployment components.

About the role
We are looking for a Lead Research Engineer or Research Scientist to own and lead the training and optimisation side of our complete post-training stack.
Starting from pretrained checkpoints, you will design, implement, scale, and operate the methods required to produce capable, reliable, and controllable production models.
Your scope will include supervised fine-tuning, preference optimisation, reinforcement learning, reward and verifier integration, policy distillation or consolidation, and distributed training.
You will be expected to set technical direction in these areas, make key design decisions, and help guide the work of other researchers and engineers while remaining deeply hands-on.
This is not a single-GPU fine-tuning or adapter-only role. You should be comfortable operating training workloads where memory, communication, rollout generation, hardware topology, and fault recovery must be designed together.

You will:

Own the end-to-end post-training pipeline from pretrained checkpoint to production candidate.
Set technical direction and priorities for post-training and reinforcement-learning work.
Design and execute full-parameter and parameter-efficient SFT.
Implement preference optimisation, RLHF, RLAIF, reinforcement learning with verifiable rewards, and related methods.
Develop training strategies for reasoning, coding, tool use, multilingual behaviour, and long-horizon agent tasks.
Integrate reward models, verifiers, critics, graders, and process- or outcome-based rewards.
Build scalable rollout-generation systems for iterative and on-policy training.
Design multi-stage curricula combining SFT, reinforcement learning, rejection sampling, distillation, and policy consolidation.
Scale training across multiple machines and accelerators using appropriate combinations of data, tensor, pipeline, sequence, context, or expert parallelism.
Select sharding, precision, checkpointing, optimiser, batch-size, sequence-length, and activation-recomputation strategies.
Estimate memory, communication, throughput, rollout capacity, and compute requirements before launching major runs.
Profile and improve accelerator utilisation, communication efficiency, data loading, and end-to-end training time.
Diagnose numerical instability, communication failures, out-of-memory errors, stragglers, checkpoint issues, and convergence regressions.
Investigate reward hacking, entropy collapse, KL drift, stale rollouts, mode collapse, grader exploitation, and benchmark overfitting.
Build reliable checkpointing, recovery, monitoring, and reproducibility procedures.
Collaborate closely with data, evaluation, infrastructure, and inference teams.
Provide technical guidance and mentorship to other researchers and engineers working on training and post-training.
Contribute clean, tested code, technical reports, and operational runbooks.

We are looking for demonstrated experience in most of the following areas:

Ownership of large-scale language-model training or post-training runs across multiple machines and accelerators.
Experience with workloads for which straightforward single-node training or pure data parallelism was insufficient.
Deep proficiency with Python, PyTorch, autograd, mixed precision, optimisation, and distributed execution.
Practical experience with PyTorch Distributed, FSDP, DeepSpeed, Megatron-Core, or an equivalent framework.
Ability to select parallelism and sharding strategies based on model, sequence, memory, and network constraints.
Strong understanding of SFT, preference optimisation, reinforcement learning, reward modelling, KL regularisation, sampling, and training stability.
Experience operating high-throughput inference or rollout systems as part of a training loop.
Ability to debug across model code, distributed communication, numerical optimisation, data, and infrastructure.
Strong experimental design and the ability to distinguish algorithmic improvements from evaluation or systems artefacts.
Experience building reliable, observable, and reproducible research software.
Personal ownership of consequential decisions affecting a substantial training programme.
Demonstrated ability to provide technical direction, review complex design choices, and raise the technical level of a team.

A PhD is not required. We value exceptional technical work, strong judgement, and demonstrated ownership.

Relevant stack:

Python and PyTorch.
PyTorch Distributed and FSDP.
DeepSpeed, Megatron-Core, or comparable frameworks.
Hugging Face Transformers.
CUDA and NCCL.
vLLM, SGLang, or similar rollout engines.
Ray, Slurm, Kubernetes, or comparable orchestration systems.
MLflow or Weights & Biases.
Docker, GCP, GitLab CI, profiling, monitoring, and pytest.

Experience with CUDA or Triton, long-context training, sparse models, asynchronous RL, stateful agent environments, distillation, or deployment-aware post-training would be especially valuable.

You may be a strong fit if you:

Enjoy working at the intersection of model research and distributed systems.
Can move from paper reproduction to reliable scaled implementation.
Are comfortable taking responsibility for expensive and operationally demanding experiments.
Approach failures methodically across algorithms, data, numerical stability, and infrastructure.
Care about held-out capability and reliability, not only training loss or reward.
Are comfortable setting technical direction while remaining deeply hands-on.
Want meaningful ownership of a complete model programme.

Location and work style:

We offer full-time employment in Switzerland.

Remote work is supported.
The team gathers approximately twice per month in a Swiss office.
Exceptional candidates elsewhere in Europe may be considered.

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