Senior Back-End Engineer

Preply; City Of London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A leading Ed-Tech company is seeking a Senior Engineer to develop backend features using Python/Django. You will collaborate with cross-functional teams to deliver engaging products and work on A/B testing. The ideal candidate will have strong backend development experience and a passion for solving complex technical challenges. Opportunities for professional growth and a supportive work environment await you.

Benefits

Generous monthly allowance for lessons

Health insurance

Relocation package

Learning & Development budget

Access to wellness platforms

Qualifications

• 5+ years of experience in backend development.
• Exposure to architectural patterns of large scale web applications.
• Ability to provide technical guidance to the team.

Responsibilities

• Develop and own backend features using Python/Django.
• Define solutions based on customer needs with the team.
• Guide the team in continuous improvement of best practices.

Skills

Python

Backend Development

A/B Testing

API Design

Team Collaboration

Education

B2 English Level

Tools

Django

Java

Node.js

Ruby

PHP

Golang

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 personalized learning journey, and stay motivated to keep growing. Our approach is human‑led, tech‑enabled—and it’s creating real impact. So far, 90,000 tutors have delivered over 20 million lessons to learners in more than 175 countries. Every Preply lesson sparks change, fuels ambition, and drives progress that matters.

Meet the team!

Join Preply's Teams and help us power people's progress through life‑changing learning experiences. We're on a mission to combine the magic of the best tutors with cutting‑edge AI to create personalized journeys that keep learners motivated and inspired. Together, we'll transform how students expand their vocabulary, master conversational fluency, and deepen comprehension—unlocking their full potential and sparking a lifelong love for learning. Are you ready to make an impact? Let’s redefine education!

The Preply Engineering Team provides the tools to help unlock human potential through learning.

We implement A/B tests to prove the value of our initiatives and improve our product based on data and students and tutors feedback. As part of our commitment to ensuring high‑quality products, we prioritize monitoring and metrics analysis to identify areas for optimization and ensure our services are performing at their best.

We are tech‑agnostic, meaning we are open to considering candidates with diverse technology backgrounds, such as Java/Spring, Node.js/Express.js, Ruby/Ruby on Rails, Scala/Play, PHP, or Golang.

While Python is our primary programming language, prior experience with it is not mandatory. What truly matters is your enthusiasm for learning Python and your ability to adapt quickly to using it for product development.

At Preply, we release our product 50‑60 times per day by leveraging top‑notch CI/CD processes. As a fast‑growing company we have diverse technical challenges (sometimes we even write about them on our Engineering Blog) that will allow you to develop your skills at scale.

What you’ll be doing

You will work in a cross‑functional team alongside the Product Manager, Product Designer, UX Writers, Data Analytics, Technical Leads, Engineers and other cross‑functional team members to deliver engaging features through A/B tests and build top‑notch products, including, but not limited to:

• Develop and own backend features using Python/Django, supporting the creation of new backend services as well as design, create, and/or troubleshoot integrations with third‑party vendors.
• Think beyond the code and about our customers, understand their needs and define solutions with the team;
• Balance short‑term speed of development with the long‑term technical quality of our systems;
• As a Senior Engineer, you will leverage your experience to guide the team in making informed technical decisions, such as continuous improvement of best practices (test culture, code reviews, monitoring and scalability of our tools).

What you need to succeed

• Exposure to architectural patterns of a large, high‑scale web application (e.g., well‑designed APIs, high‑volume data pipelines, efficient algorithms);
• Familiar and willing to support small JS/TS tasks when needed;
• Expertise in troubleshooting issues, identifying the root cause, mitigating it, and setting up safeguards to prevent future issues;
• High level of self‑organization, ownership, and responsibility;
• A great collaborator with excellent verbal and written communication skills. Minimum B2 English level;
• Willingness to be on‑call for your squad (1 week every 5 weeks).

Why you’ll love it at Preply

• An open, collaborative, dynamic and diverse culture;
• A generous monthly allowance for lessons on Preply.com, Learning & Development budget and time off for your self‑development;
• A competitive financial package with equity, leave allowance and health insurance;
• Not in Barcelona? We offer an attractive relocation package to join us in our Preply Barcelona Hub;
• Access to free mental health support platforms;
• Access to Gympass‑partnered wellness and gym centers throughout Spain to promote and support well‑being and physical health;
• The opportunity to shape the lives of learners and tutors through language learning and teaching in 175 countries (and counting!).

#LI-KD2

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 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.