---
title: 'Staff Machine Learning Ops Engineer at Preply'
canonical: 'https://feeny.ai/job/staff-machine-learning-ops-engineer-preply-london-w2wc67h74187'
type: 'job'
last_seen: '2026-10-14'
---

# Staff Machine Learning Ops Engineer at Preply

- **Company:** [Preply](https://feeny.ai/companies/preply)
- **Location:** London, United Kingdom
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-06-24
- **Last confirmed live:** 2026-10-14
- **Apply:** https://jobs.ashbyhq.com/preply/b8e34d91-1730-4081-b1f6-72a954681b41/application

**Skills:** GCP, AWS, Kubernetes, Distributed compute, CI/CD, Observability, Infrastructure-as-code, Cloud-native architecture, ML platform architecture, GenAI infrastructure, LLM frameworks, LangChain, LlamaIndex, Vector stores, Retrieval systems, Prompt evaluation, Model serving, LLM observability

> Define and evolve Preply's ML platform to enable scalable, secure, and cost-efficient machine learning at company scale. This senior technical leadership role involves architecting cloud-native infrastructure, setting CI/CD standards, and mentoring engineers to support GenAI and LLM capabilities.

## Job description

We power people’s progress. At Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it’s creating real impact. We’ve just reached unicorn status with a $150M Series D, accelerating our vision to transform education through human-led, AI-enhanced learning. Today, 100,000+ tutors teach 90+ languages to learners in 180 countries - and we’re only getting started. As a category-defining company, we’re shaping what the future of learning looks like at global scale. Every Preply lesson sparks change, fuels ambition, and drives progress that matters. Joining Preply means helping define the future of education at global scale, and building something that truly matters for millions of people, every day. Meet the team! Preply is scaling an AI-powered learning platform used by millions of learners and tutors worldwide. As ML and GenAI become increasingly central to our product, marketplace, and operational systems, we’re looking for a Staff ML Ops Engineer to define and evolve the platform that enables machine learning at company scale. This is a senior technical leadership role for an engineer who can combine deep hands-on expertise with platform vision. You will help define the current and future direction of Preply’s ML platform, set technical standards, and design the systems that allow ML teams to move from research to production quickly, safely, and cost-efficiently. You’ll partner closely with Applied Science, Data, Product, and Engineering leadership to build a scalable, secure, and observable ML platform that powers multiple business lines. Your impact will come not only from the systems you design, but from the standards you set, the engineers you mentor, and the technical decisions you help de-risk across the organization. Why is this role important: Preply’s next stage of growth depends on making AI a scalable company-wide capability, not a collection of isolated models and experiments. This role will define how ML systems are built, deployed, monitored, and improved across the company. You’ll shape the platform that powers personalized learning, smarter experiences for tutors and learners, marketplace intelligence, content generation, automation, and future GenAI products. The goal is to make it dramatically easier for teams to turn ML ideas into reliable, secure, cost-efficient product experiences at a global scale.

What you’ll be doing:

- Define the technical vision and roadmap for Preply’s ML platform, ensuring it can support growing ML and GenAI adoption across multiple teams, products, and business lines.
- Lead the architecture of platform capabilities across the full ML lifecycle: experimentation, feature engineering, artifact management, training, deployment, monitoring, retraining, and governance.
- Design cloud-native infrastructure for distributed training and inference, including GPU-based environments, autoscaling, workload isolation, rollout strategies, and cost optimization.
- Set the technical direction for CI/CD for ML, embedding testing, validation, security, performance checks, and release confidence into deployment pipelines.
- Establish observability standards for ML systems, including model metrics, service health, alerts, drift detection, data quality, lineage, and business-impact monitoring.
- Lead the evolution of Preply’s GenAI and LLM platform capabilities, including building LLM Gateway services, vector retrieval infrastructure, prompt experimentation, evaluation frameworks, latency-optimized inference, and reliable model-serving patterns.
- Partner with Applied Science and Data leads, Product leaders, and Engineering teams to align platform investments with experimentation velocity, cost efficiency, operational reliability, and user impact.
- Design platform abstractions, internal libraries, templates, and self-service tooling that help ML Scientists and engineers move faster without compromising reliability or security.
- Act as a technical multiplier across engineering by mentoring senior engineers, influencing architecture, raising standards, and guiding teams through complex platform decisions.
- Identify and eliminate bottlenecks in the path from ML research to production, making the platform easier, safer, and more efficient for all ML-powered product development.

What you need to succeed:

- 9+ years of engineering experience, with significant depth in large-scale ML, data, infrastructure, or platform systems.
- Proven ability to architect and scale production-grade ML platforms that support many teams, workflows, and ML use cases.
- Deep understanding of cloud-native architecture and end-to-end ML workflows, including experimentation, feature management, model versioning, training, deployment, monitoring, performance benchmarking, and lifecycle management.
- Strong hands-on experience with cloud platforms such as GCP or AWS, Kubernetes, distributed compute, CI/CD, observability, and infrastructure-as-code practices.
- Experience building enabling tools and platform capabilities for Applied Scientists, Data Scientists, and engineering teams.
- Strong technical judgment and the ability to make pragmatic architecture decisions across reliability, scalability, security, cost, and developer experience.
- Excellent communication and influence skills, with experience aligning cross-functional stakeholders and translating platform strategy into execution.
- Demonstrated ability to mentor engineers, raise engineering standards, and multiply the impact of teams around you.
- Product-impact mindset: you care about building platform capabilities that accelerate experimentation, improve user experiences, and unlock measurable business value.
- Familiarity with LLM frameworks and GenAI infrastructure, such as LangChain, LlamaIndex, vector stores, retrieval systems, prompt evaluation, model serving, or LLM observability.

## Why you’ll love it at Preply

- An open, collaborative, dynamic and diverse culture;
- A generous monthly allowance for lessons on[Preply.com](http://preply.com/), Learning & Development budget and time off for your self-development;
- A competitive financial package with equity, leave allowance and health insurance;
- Access to free mental health support platforms;
- The opportunity to unlock the potential of learners and tutors through language learning and teaching in 175 countries (and counting!)

## #LI-AG1

Our Principles

- Care to change the world - We are passionate about our work and care deeply about its impact to be life changing.
- We do it for learners - For both Preply and tutors, learners are why we do what we do. Every day we focus on empowering tutors to deliver an exceptional learning experience.
- Keep perfecting - To create an outstanding customer experience, we focus on simplicity, smoothness, and enjoyment, continually perfecting it as every detail matters.
- Now is the time - In a fast-paced world, it matters how quickly we act. Now is the time to make great things happen.
- Disciplined execution - What makes us disciplined is the excellence in our execution. We set clear goals, focus on what matters, and utilize our resources efficiently.
- Dive deep - We leverage business acumen and curiosity to investigate disparities between numbers and stories, unlocking meaningful insights to guide our decisions.
- Growth mindset - We proactively seek growth opportunities and believe today's best performance becomes tomorrow's starting point. We humbly embrace feedback and learn from setbacks.
- Raise the bar - We raise our performance standards continuously, alongside each new hire and promotion. We build diverse and high-performing teams that can make a real difference.
- Challenge, disagree and commit - We value open and candid communication, even when we don’t fully agree. We speak our minds, challenge when necessary, and fully commit to decisions once made.
- One Preply - We prioritize collaboration, inclusion, and the success of our team over personal ambitions. Together, we support and celebrate each other's progress.

Diversity, Equity, and Inclusion [Preply.com](http://Preply.com) is committed to creating an inclusive environment where people of diverse backgrounds can thrive. We believe that the presence of different opinions and viewpoints is a key ingredient for our success as a multicultural Ed-Tech company. That means that Preply will consider all applications for employment without regard to race, color, religion, gender identity or expression, sexual orientation, national origin, disability, age or veteran status.

## About Preply

## Company Overview
- **One-liner**: Preply is a human-led, AI-enabled online language learning marketplace that connects over 100,000 tutors with millions of learners worldwide for personalized 1-on-1 lessons.
- **Entity Type**: Private (Series D – unicorn, $1.2B valuation as of January 2026)
- **Headquarters**: Brookline, Massachusetts, United States (with global hubs in Barcelona, London, Kyiv, and New York)
- **Founded**: 2012
- **Founders**: Kirill Bigai (CEO) and Dmytro Voloshyn (CTO)

## Core Business
- **Primary industry**: Language learning / EdTech
- **Target customers**: B2C (individual learners) and B2B (corporate language training via Preply Business); primarily B2C but growing enterprise segment.
- **Mission or purpose statement**: "Power people’s progress" – combining the flexibility of online learning with personalized lessons from expert tutors to create life‑changing experiences.

## Products & Services
- **Preply Marketplace**: A platform where learners book 1‑on‑1 live lessons with tutors teaching 90+ languages and 120+ subjects. Tutors manage scheduling, payments, and an integrated video classroom.
- **Preply Business**: Corporate language training solution for companies to upskill employees, offering tailored programs and reporting.
- **AI‑Powered Tools**: New‑generation AI‑enhanced tutoring features (including AI‑generated content and adaptive learning tools) designed to supplement human‑led instruction. The company also provides enterprise OpenAI licenses to employees.

## Market Standing
- **Valuation/Market Cap**: $1.2 billion (post‑money after January 2026 Series D) – becoming a unicorn.
- **Key Metric**: Over $100K total funding? Actually total disclosed funding is ~$150M+ (Series A, B, C) plus the $150M Series D. Annual revenue is not publicly available (private company). Key growth metric: 100,000+ tutors across 180 countries.
- **Notable Investors/Partners**: WestCap (led Series D), Owl Ventures, Horizon Capital, Hoxton Ventures, Full In Partners, Diligent Capital Partners, Point Nine Capital (led Seed round).
- **Growth Signals**: 
  - Unicorn status reached in Jan 2026.
  - B2B segment “Preply Business” growing.
  - Completed first employee tender offer in May 2026 to provide early liquidity.
  - CEO Kirill Bigai named EY Entrepreneur Of The Year® 2026 New England Finalist.
  - 700+ employees globally; 62+ nationalities represented.

## Competitive Advantages
- **Network effects**: Large two‑sided marketplace with 100K+ tutors and millions of learners creates a strong moat in the $115B global language learning market.
- **Human‑led + AI‑enabled**: Differentiates from purely self‑study apps (e.g., Duolingo) by combining live human interaction with AI‑powered personalization.
- **Global reach**: Tutors from 180 countries teaching 90+ languages, enabling learners to find native speakers for almost any language.
- **Trust & quality**: Focus on tutor quality and learner progress, with internal engagement surveys showing 86% of employees proud to work at Preply.

## Strategic Focus
- **AI integration**: Deepen AI capabilities to enhance tutoring (content generation, adaptive learning paths) while keeping human interaction central.
- **B2B expansion**: Grow Preply Business as a key revenue driver for corporate language training.
- **Global hub growth**: Strengthen presence in existing hubs (Barcelona, London, Kyiv, New York) and expand into new markets.
- **Talent & culture**: Continue building a people‑first culture with employee liquidity events and strong engagement scores.

## Why Work Here
- **Culture**: Guided by five “Preply principles” (Ambition, Keep Perfecting, Care to Change the World, etc.). 86% of employees are proud to work at Preply (2025 survey); 84% would recommend it as a great place to work.
- **Work model**: Hybrid working model (flexible remote/in‑office). Main office in Barcelona with hubs in New York, London, and Kyiv.
- **Perks**: Competitive salaries, stock options, L&D days, monthly Preply platform allowance, wellness benefit, health insurance, flexible compensation program, after‑work gatherings, offsite events, enterprise OpenAI licenses.
- **Hiring process**: 4 stages – TA chat, interviews with hiring team (may include tech test), a final task (case study / peer programming / deep technical discussion), and a Culture Champion interview.
- **Global team**: 62+ nationalities and 700+ employees, offering a diverse, collaborative environment.

## Sources
1. [Preply Careers](https://preply.com/en/careers)
2. [Preply About Us](https://preply.com/en/about-us)
3. [Preply Homepage](https://preply.com/)
4. [CB Insights Company Profile](https://www.cbinsights.com/company/preply)
5. [Preply LinkedIn](https://www.linkedin.com/company/preply)

## Other roles at Preply

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