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LLM Training Services

Optimize your LLM’s performance with experts trusted by 1500+ companies.

We build custom, fine-tuned LLMs for fast-scaling startups and Fortune 500 enterprises alike. Count on us for everything from model selection to evaluation pipelines.

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4.9/5

4.9/5 stars

60 client reviews

We've had quite a few superstars who resolve our problems without our full-time engineers having to step in.

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Trusted by the CTOs and VPs at
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LLM Training services

No matter what you’re building, we can help.

We support the LLM training lifecycle from end to end. Bring in our LLM development experts to train safer, more accurate, and task-ready large language models.

  • Google Cloud Platform Partner
  • AWS Partner
  • ISO 27001 certified - Information Security Management System
  • LLM Fine-Tuning

    Base AI models aren’t optimized for your domain, data, or KPIs. Our fine-tuning services adapt them to your business context — improving performance on domain-specific tasks and company workflows.

    We manage the entire process: curating and preparing training datasets, applying parameter-efficient or full fine-tuning methods, and evaluating against task-specific metrics. The result is a model optimized for your tasks, deployed through reproducible pipelines, and monitored to ensure stable performance over time.

  • LLM Factuality

    Even the most advanced LLMs are prone to hallucinations. Our factuality services reduce this risk by grounding your models in trusted data sources, applying fine-tuning that prioritizes correctness, and adding verification layers such as citations and fallback responses.

    Our experts work to prevent output that might give users false info, introduce errors into workflows, or create compliance exposure. We make sure your model answers confidently and accurately so teams and customers can rely on it.

  • LLM Safety & Alignment Tuning

    LLMs don’t naturally understand your company or its policies, which can lead to biased, offensive, or unsafe outputs. To reduce this risk, we fine-tune models to follow your compliance requirements, ethical standards, and brand guidelines.

    Our work involves applying domain-specific training data, reinforcement learning, and guardrails such as filtering layers and safe refusal strategies. As a result, you get an LLM that consistently behaves in line with your organization’s policies and values.

  • LLM Evaluation Services

    Without systematic evaluation, you’re left guessing about whether the model is accurate, safe, or delivering business value. Bring in our LLM evaluation experts to get a complete, objective view of your model’s performance across the dimensions that matter most to your organization.

    We build evaluation pipelines that measure benchmarks like accuracy, factuality, safety, bias, latency, and user satisfaction. Our process combines automated testing methods — including LLMs-as-judges for large-scale scoring — with human-in-the-loop reviews and adversarial stress tests to uncover weaknesses that standard metrics miss. We also set up monitoring dashboards that track performance over time, so you can spot drift early and make informed improvements.

  • RLHF Services

    Model quality can’t be solved with data or prompts alone. Using reinforcement learning with human feedback (RLHF), we incorporate human judgment into the training loop. This helps shape model behavior to reflect expert reasoning in nuanced or high-risk domains.

    We design and implement complete RLHF pipelines that continuously collect human feedback, retrain reward models, and optimize your LLM output over time. Our process allows your model to consistently generate responses that match your requirements, responding like a human expert would.

  • RAG (Retrieval-Augmented Generation) Systems

    LLMs become far more powerful when they can tap into your proprietary knowledge, company policies, and real-time updates at inference time.

    With Retrieval-Augmented Generation (RAG), we build pipelines that ingest and structure your internal data, create vector indexes for fast search, and retrieve the most relevant info at query time. That context is fed into the model. So you get accurate, up-to-date outputs without the high cost and delays of constant retraining.

  • Prompt and Context Engineering

    LLMs deliver the most value when applications are engineered to provide the right instructions and context at every API call. We design prompt patterns for single prompts, chained flows, and agentic workflows. Our engineers also optimize how context is managed with retrieval, summarization, and templating.

    By standardizing these approaches and testing them at scale, we make sure your systems deliver accurate, predictable outputs with lower token costs.

  • Application QA for LLM-Powered Tools

    LLM-backed apps behave differently from traditional software. Outputs can vary drastically, break under edge cases, or shift over time—making standard QA incomplete.

    We design custom test suites to validate prompts, detect hallucinations, and flag regressions. As a result, you get faster cycles, fewer failures, and more confidence when shipping LLM-powered features.

LLM & AI Case Studies

Dozens of LLM and AI projects delivered.

We have the experience and technical expertise to train and optimize high-performing LLMs for any use case. It’s why 500+ companies choose us as their LLM development partner.

  • Case Study Background Healthcare
    Healthcare

    Built Clinical Trial System Powered by AI and LLMs

  • Case Study Background Environmental Services
    Environmental Services

    Built AI Auditing Tools for Emissions Compliance and Regulatory Reporting

  • Case Study Background iWave
    Artificial Intelligence

    Integrated Automated GenAI Video for HubSpot Campaigns

LEGAL SERVICES

Built a GenAI legal app using RAG and LLM training techniques, reducing analysis time by 99%

  • 19 specialists

Our client needed to optimize the tedious task of analyzing legal documents. In 9 months, we built an app that reduced document revision from one week to a few minutes. Our team used RAG techniques to provide precise responses for inputs from legal depositions and advanced techniques like Chain of Thought and Few-Shot learning to enhance LLM reasoning.

  • Applied RAG with answer retrieval and similarity search for legal context

  • Used Chain of Thought, Few-Shot, and Zero-Shot methods to improve reasoning

  • Trained on curated legal datasets to avoid compliance risks

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Get expert help for your LLM Training project.

Their engineers perform at very high standards. We've had a strong relationship for almost 7 years.

Our LLM Training teams

Meet the machine learning experts behind our best work.

Behind every successful LLM solution is a highly specialized team. That’s why we have experts for every stage of LLM training, from data preparation and prompt engineering to fine-tuning and evaluation.

    • PyTorch
    • Hugging Face
    • LangChain
    • NVIDIA-Certified Associate Generative AI LLMs
    • Google Cloud Professional Machine Learning Engineer
    • Apache Airflow
    • Spark
    • SQL
    • Python
    • Google Professional Data Engineer
    • Databricks Certified Data Engineer Professional
    • LangChain
    • Jupyter
    • GPT-4
    • Python
    • IBM RAG and Agentic AI Professional Certificate
    • AWS Generative AI for Developers Professional Certificate
    • MLflow
    • Docker
    • Terraform
    • SageMaker
    • AWS Certified Machine Learning – Specialty
    • Kubernetes Administrator (CKA)
    • Selenium
    • Playwright
    • Python
    • REST Assured
    • ISTQB Advanced Test Automation Engineer
    • Certified Software Quality Analyst (CSQA)

Onboard an LLM training team in weeks, not months.

About BairesDev

Why work with BairesDev?

We’re trusted by the world’s top tech teams.

BairesDev is a US-based company powered by LATAM dev teams. Since 2009, we’ve built software for companies of all sizes—from scrappy startups to Fortune 500 giants. In fact, we’re one of the fastest-growing software development companies in the world. If you’re looking for onshore quality with nearshore benefits, we’re the partner for you.

1250+

Projects Delivered

4000+

Developers On Staff

96%

Client retention rate

500+

Active clients
Why work with us

How we work

Here’s what makes us easy to work with and hard to replace:

From code quality to compliance, we’ve optimized every part of how we work to support high-performing engineering teams. For you, that means clearer communication and smoother delivery. Plus, get peace of mind from having a development partner you can depend on.

  • Vetted Senior Talent
    We hire the top 1% of over two million applicants, so you only work with the best.
    We give you engineers who’ve already proven they can deliver. Our rigorous evaluation process includes technical tests, English assessments, soft skill screening, problem-solving simulations, and more. Out of over 2 million applicants who apply yearly, fewer than 1% get the chance to join our team. This is how we ensure you get highly qualified developers who are experts in their fields.
  • Timezone Aligned
    We work your team’s hours, which creates faster feedback loops and fewer blockers.
    Our nearshore software engineers share your workday, answering Slack messages, joining daily stand-ups, and presenting demos in real time. Project management is streamlined, questions are answered quickly, blockers are resolved as they come up, and simple code reviews take minutes, not days.
  • Proficient in English
    Our engineers have strong English skills, so communication and documentation are clear.
    Our engineers have 8+ years of experience collaborating with US teams. They excel at articulating complex technical concepts to diverse stakeholders, producing meticulous documentation, and driving technical discussions. This eliminates the ambiguity common with global teams.
  • Full-stack Capabilities
    With expertise in 100+ technologies, we have every specialist your project requires.
    We cover architecture, development, testing, DevOps, and everything in between—reducing hand-offs and creating better architecture decisions for a smoother path from concept to production.
  • Scalable Teams
    Our bench strength lets you scale engineering teams to meet new demands in weeks.
    With 4,000+ engineers on staff and thousands more in our pipeline, we can spin up pods or scale multiple teams across your company in days—so you hit aggressive timelines without bottlenecks.
  • Standard MSAs & SOWS
    We’re easy to onboard because we work the way your legal team expects us to.
    Because we’re based in the US, we follow the same legal standards your team already trusts—using MSAs, SOWs, and documentation that fit your procurement process.
  • NDAs & IP Protection
    We take data and IP seriously, with full protection baked into every engagement. 
    Every engagement begins with a mutual NDA and clear IP ownership terms. Our secure workflows and confidentiality protocols also protect existing codebases and proprietary data.
  • Enterprise-grade Security
    Our devs follow security protocols that meet even the strictest enterprise standards.
    Our engineers work only within the systems they need, using strict access control, audit-friendly workflows, secure repository storage, and more—bringing enterprise-grade protection to every engagement.
  • Managed Delivery
    We actively track our devs’ work to make sure they consistently meet expectations.
    Delivery managers monitor progress, resolve blockers, and report regularly, so you never have to chase updates or second-guess performance.

Work with our machine learning experts.

Flexible engagement models

Need LLM expertise?
Plug us in where you need us most.

We customize every engagement to fit your workflow, priorities, and delivery needs.

  • Need a couple of extra software engineers on your team?

    Staff Augmentation

    Get senior, production-ready developers who integrate directly into your internal team. They work your hours, join your standups, and follow your workflows—just like any full-time engineer.

  • Need a few teams to deliver several projects in simultaneously?

    Dedicated teams

    Spin up focused, delivery-ready pods to handle full builds or workstreams. Together we align on priorities. Then our tech PMs lead the team and drive delivery to maintain velocity and consistency.

  • Want to offload everything to us, from start to finish?

    Software outsourcing

    Hand off the full project lifecycle, from planning to deployment. You define the outcomes. We take full ownership of the execution and keep you looped in every step of the way.

Kick off LLM Training projects in 2-4 weeks.

We have reps across the US.

Speak with a client engagement specialist near you.

  1. Discuss solutions and decide team structure.

    Tell us more about your needs. We'll discuss the best-fit solutions and team structure based on your success metrics, timeline, budget, and required skill sets.

  2. Onboard your team and get to work.

    With project specifications finalized, we select your team. We're able to onboard developers and assemble dedicated teams in 2-4 weeks after signature.

  3. We track performance on an ongoing basis.

    We continually monitor our teams' work to make sure they're meeting your quantity and quality of work standards at all times.

LLM Training Solutions

Build with LLM engineers who have experience in your industry.

We’ve delivered projects across 130+ industry sectors. You won’t have to spend weeks getting us up to speed. Our engineers come in with a clear understanding of your industry's complexity, compliance requirements, and unique needs.

  • Train LLMs to accelerate case prep, streamline knowledge access, and reduce document review time.

    Build solutions for:
    • Extracting answers from legal documents
    • Contract summarization and flagging
    • Internal case law search tools
    • Regulatory compliance assistance
    • AI-driven legal intake forms
    • Document clustering and deduplication
    • Drafting memos and legal templates
    • Client communication assistants
    • Legal research summarization
    • Discovery document review automation

LLM TRAINING CAPABILITIES

We cover the LLM stack (and everything around it).

As a top LLM training company, we use a modern tech stack built for performance and scale, with a focus on proven tools. With capabilities in 100+ technologies, we can support your entire software roadmap—LLMs and beyond.

  • Data Collection & Preprocessing

    We design and implement scalable systems for data acquisition, cleansing, labeling, and transformation—essential for high-quality LLM training. Whether you're using proprietary data or augmenting with synthetic samples, we make sure your inputs are optimized for downstream use.
    Python
    Pandas
    spaCy
    NLTK
    BeautifulSoup
    Label Studio
    Snorkel
  • Training Infrastructure

    We build and manage cloud-based or on-prem environments for model training. Our team handles GPU provisioning, distributed training, and container orchestration to support large-scale LLM workloads.
    PyTorch
    TensorFlow
    Hugging Face Transformers
    DeepSpeed
    Ray
    AWS EC2
    Azure ML
    Google Vertex AI
  • Evaluation & Benchmarking

    We implement task-specific benchmarks, hallucination tests, and safety evaluations to assess model performance. Our frameworks make it easy to track quality and iterate quickly across releases.
    OpenAI Evals
    Eleuther Eval Harness
    Trulens
    Giskard
    Langsmith
  • Prompt Engineering & Optimization

    We design prompt templates, tuning strategies, and reusable prompt libraries to drive performance without retraining. This includes building A/B testing frameworks and evaluation loops.
    LangChain
    PromptLayer
    Jinja2
    Weights & Biases
  • RLHF & Feedback Systems

    We build pipelines for human feedback, reward models, and policy tuning—plus user training for effective operation.
    Argilla
    Hugging Face TRL
    Weights & Biases (WandB)
    Ray
  • Application Development

    We build secure, scalable apps powered by LLMs—including internal copilots, customer-facing chatbots, and domain-specific tools.
    Python
    Next.js
    React
    Node.js
    Vercel
    Docker
  • QA & Testing for LLMs

    We validate output correctness, test prompt stability, and monitor for regressions using custom QA frameworks built for LLM-driven systems.
    pytest
    Playwright
    Selenium
    Trulens
    Great Expectations
  • Monitoring, Logging & Drift Detection

    We implement robust monitoring systems to track output quality, latency, and model drift in production environments.
    Prometheus
    Grafana
    Arize AI
    WhyLabs
    Sentry
    Datadog
Curious how we’d approach your ML project?

Llm Training Process

How we deliver large language model training services that drive business value:

We’ve refined our LLM training services across hundreds of projects. Whether you need end-to-end execution or support for an internal team, we step in wherever you need us to move projects forward without friction.

Discovery & Requirements Alignment

We align on use cases, compliance standards, and success metrics so the customized training plan directly supports your business goals.

1

Data Strategy & Preparation

We collect, clean, and structure datasets—masking or anonymizing sensitive data to meet HIPAA, PCI DSS, or GDPR.

2

Feature Engineering & Preprocessing

We design tokenization, embeddings, and domain-specific features to make raw data usable for LLM training.

3

Model Architecture Selection

We help you choose a foundation model that fits your goals today—balancing accuracy, cost, and scalability—while designing the architecture for future adaptability.

4

Environment Provisioning & Scaling

We provision secure, containerized GPU/TPU environments with Terraform and Helm, enabling repeatable, scalable training.

5

Training & Fine-Tuning

We apply techniques like RLHF, domain-specific fine-tuning, and prompt optimization to shape the learning process.

6

Evaluation & Benchmarking

We validate outputs with domain-specific test sets and industry benchmarks, tracking bias, accuracy, and efficiency.

7

Performance & Security Validation

We run load and robustness tests while auditing for data leakage and vulnerabilities before production rollout.

8

Deployment & Integration

We deliver models as APIs or containerized endpoints and integrate them seamlessly into your existing systems.

9

Continuous Monitoring & Optimization

We track drift, accuracy, and feedback, retraining or migrating to stronger base models over time to keep performance current.

10

Client testimonials

Get AI outcomes you can stand behind.

Our work holds up in reviews, in production, and in front of the board.

Join 500+ companies who count on our $SERVICE_NAME developers

Global companies have trusted us to build and scale custom machine learning solutions for over a decade.

  • Forcepoint
  • Abbott
  • AbbVie
  • Abra
  • Acklands-Grainger
  • Acumen
  • Arlo
  • Associated Press
  • Autodesk
  • Avigilon
  • Azlo
  • BBVA
  • Blackboard
  • Burger King
  • Care.com
  • Chime
  • ConsumerAffairs
  • GlobalStart
  • CropTrak
  • eBay
  • Ernst & Young
  • Fresenius
  • Gennev
  • Google
  • Great Wolf Lodge
  • Groupon
  • Hewllet-Packard
  • HomeAdvisor
  • IBM
  • Instructure
  • IPG Mediabrands
  • IQVIA
  • iSeatz
  • iWave
  • Johnson & Johnson
  • Kapsch
  • Keller Williams
  • Kinesso
  • Limeade
  • Netgear
  • Newsela
  • NextRoll
  • Panasonic
  • Patra Company
  • Pinterest
  • R/GA
  • Regeneron
  • Repay
  • Rolls-Royce
  • Salesforce
  • Sana Sano Consulting
  • SAP
  • SiriusXM
  • Swordpoint
  • Thomson Reuters
  • Ticket Galaxy
  • Trone Brand Energy
  • Turner
  • Udemy
  • Univision
  • Urban Outfitters
  • Verisk
  • ViacomCBS
  • Volkswagen
  • Volvo
  • Whirlpool
  • Xtensifi

Excellence.
Our minimum bar for client delivery.

Over 130 awards, accolades, and achievements showcase our quality and commitment to client success.

Our trophy cabinet
  • 1,250+projects
    delivered
    projects executed successfully
  • 130+industry
    sectors
    industry sectors industry sectors
  • America's Fastest-Growing Companies 2025 by Financial Times
    America's Fastest-Growing Companies 2025 by Financial Times
  • Top 100 U.S. IT Innovators 2025 by CIO100 Awards
    Top 100 U.S. IT Innovators 2025 by CIO100 Awards
  • Nearshore North America Top Software Developers 2025 by Clutch
    Nearshore North America Top Software Developers 2025 by Clutch
  • Top 100 Global Outsourcing Providers 2024 by IAOP Global Outsourcing 100
    Top 100 Global Outsourcing Providers 2024 by IAOP Global Outsourcing 100

Accelerate machine learning development and delivery with our top-rated nearshore teams.

Schedule a Call

Llm Training Faq

What tech leaders ask about our LLM training services:

  • How fast can you get a team started?

    We typically assemble and onboard a team in 2–4 weeks. Because our engineers are pre-vetted through a rigorous multi-month process, they integrate quickly with your workflows and begin delivering value right away.
  • What roles or expertise do you provide for an LLM project?

    We can staff your projects with any roles relevant to LLM development. This typically includes ML engineers, data engineers, and data scientists, along with prompt engineers, QA, evaluators, and MLOps.
  • What types of LLMs do you train?

    We support a broad range of LLM use cases. Some clients need task-specific models like virtual assistants, language translation, or domain-specialized systems built on proprietary datasets. Others focus on adapting pre-trained models for a particular task, improving contextual understanding, and generating more reliable, human-like responses.

    Depending on the project, we may apply retrieval mechanisms, further training with high-quality data, or learning from human feedback to align outputs with business objectives. Our goal is always the same: deliver LLMs that perform consistently, scale efficiently, and meet your organization's unique needs.
  • Have you delivered LLMs for companies like ours before?

    Likely. We’ve supported dozens of LLM and AI initiatives across industries, even in highly regulated sectors like legal and financial services. Many of these projects required meeting strict compliance and security standards. So, regardless of how tough your requirements are, we have the expertise to meet them.
  • How do you keep LLM training projects cost-effective?

    We use modular pipelines that focus on targeted fine-tuning, retrieval-augmented generation (RAG), and synthetic data. This avoids unnecessary retraining cycles, keeps infrastructure costs under control, and helps you move faster.
  • How do you handle sensitive or regulated data?

    We follow SOC 2 and ISO-certified processes, adapt to requirements like HIPAA or PCI DSS, and provide full IP protection in our contracts. Data from proprietary datasets is processed in controlled environments, protecting both your information and compliance posture.
  • How do you make sure our LLM solution integrates with existing systems and workflows?

    We build LLMs to work like any other part of your software stack. That means packaging them so they run inside your infrastructure, exposing them through APIs your systems already use, and running updates through your DevOps and CI/CD pipelines. We also align with your security workflows, so the solution is tested, monitored, and secure.
  • How do you make sure the models are accurate and reliable?

    We cover the full spectrum of model performance. We start by aligning the model with your data and goals, then run it through rigorous testing before anything goes live. Our team builds in guardrails to reduce errors and hallucinations, and we monitor performance in production so the model keeps improving over time. The result is a system you can trust to deliver consistent, accurate outputs in real-world use.
  • How do you keep improving models after launch?

    We provide continuous monitoring and fine-tuning so your models get more accurate and aligned over time. By tracking performance in production and applying targeted updates, we help you sustain long-term value from your LLM investment.
  • How experienced are your LLM engineers?

    Our engineers are highly skilled in LLM development. They represent the top 1% of over 2 million yearly applicants.

    To join our team, they must pass a multi-month vetting process featuring technical assessments and interviews. Most hold advanced machine learning certifications and bring 10+ years of experience with AI and ML work.
  • How do you approach model selection?

    We evaluate foundation models against your goals, cost, compliance, and scalability, then recommend the best fit for fine-tuning or adaptation.

    Just as important, we design the architecture with flexibility in mind—so when new foundation models surpass today’s choice, migrating is straightforward. That way you get the best option now without getting locked in later.
  • How do you evaluate performance during training?

    We apply task-specific benchmarks, bias and consistency tests, and human-in-the-loop reviews to confirm real-world reliability.

Useful LLM Training resources

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