Back End Developer Engineer in London

Back End Developer Engineer in London

London Full-Time 60000 - 80000 € / year (est.) No home office possible
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At a Glance

  • Tasks: Build and iterate on backend services for an AI-driven SaaS platform.
  • Company: Join a dynamic, early-stage tech company in London.
  • Benefits: Equity opportunities, competitive salary, and a collaborative work environment.
  • Other info: Enjoy significant autonomy and excellent career growth potential.
  • Why this job: Make a real impact by developing cutting-edge infrastructure and systems.
  • Qualifications: Experience in backend development and strong problem-solving skills required.

The predicted salary is between 60000 - 80000 € per year.

We're looking for a Backend Engineer to join an early-stage, revenue-generating AI-driven SaaS platform. Backend engineers who love owning systems end-to-end, want early-stage equity upside, and thrive in fast-moving environments.

Responsibilities:

  • Scope, build, ship, and iterate on backend services and infrastructure that power our core product.
  • Build scalable infrastructure for AI agent systems, dialer infrastructure, and intelligent pipelines that handle thousands of concurrent operations.
  • Design and implement core backend systems including APIs, databases, event processing, and real-time data pipelines that support the product.
  • Collaborate with frontend engineers and product leadership to translate customer needs into technical architecture and implementation.
  • Own reliability and performance: Contribute to technical direction and engineering standards, helping shape how we approach problems and build systems.
  • Ship regularly and iterate: Build the dialer infrastructure, agent systems, intelligence pipelines, and data processing engines.

Requirements:

  • Strong technical foundation: You've built complex systems at scale - whether at a top-tier tech company, in a startup, or through ambitious projects.
  • Deep knowledge of data structures, algorithms, system design, and performance trade-offs.
  • AI/LLM experience (a plus): Experience building with AI agents, RAG systems, or LLM-powered features is valuable but not required.
  • Comfortable with modern backend languages and frameworks, plus exposure to databases and infrastructure tooling.
  • Professional software engineering experience: Strong backend and full-stack web development skills.
  • Computer science fundamentals: Solid grasp of data structures, algorithms, system design, and performance optimization.
  • TypeScript/JavaScript or equivalent: Production experience with modern backend languages and frameworks.
  • Database and infrastructure knowledge: Experience designing schemas, optimizing queries, and working with modern databases (SQL/NoSQL).

Office-first culture: Based in London, 5 days per week. Academic foundation in computer science or equivalent self-taught depth.

Opportunity to grow.

Back End Developer Engineer in London employer: Nelly Works

Join a dynamic and innovative team in our London office, where you'll have the opportunity to shape cutting-edge AI-driven solutions as a Back End Developer Engineer. We foster an office-first culture that encourages collaboration and autonomy, providing you with the chance to work on impactful projects while enjoying significant growth opportunities within an early-stage, revenue-generating SaaS platform. With a focus on employee development and a commitment to building scalable infrastructure, we offer a rewarding environment for those looking to make a meaningful contribution in the tech industry.

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Contact Detail:

Nelly Works Recruiting Team

StudySmarter Expert Advice🤫

We think this is how you could land Back End Developer Engineer in London

Tip Number 1

Network like a pro! Reach out to folks in the industry, attend meetups, and connect with other developers. You never know who might have the inside scoop on job openings or can refer you directly.

Tip Number 2

Show off your skills! Create a portfolio showcasing your projects, especially those that highlight your backend expertise. Make sure to include any AI-related work if you've got it—this could really set you apart!

Tip Number 3

Prepare for interviews by brushing up on your technical knowledge. Be ready to discuss your past projects in detail, especially how you tackled challenges and built scalable systems. Practice coding challenges to keep your skills sharp!

Tip Number 4

Apply through our website! We love seeing candidates who are genuinely interested in joining us. Tailor your application to highlight how your experience aligns with our needs, and don’t forget to express your enthusiasm for the role!

We think you need these skills to ace Back End Developer Engineer in London

Backend Development
API Design
Database Management
Event Processing
Real-Time Data Pipelines
System Design
Performance Optimization

Some tips for your application 🫡

Show Your Passion for Backend Engineering:When writing your application, let us see your enthusiasm for backend development shine through! Share specific projects or experiences that highlight your skills in building scalable systems and how you’ve tackled challenges in the past.

Tailor Your Application to Us:Make sure to customise your application to fit our job description. Highlight your experience with APIs, databases, and any AI-related projects you've worked on. We want to see how your background aligns with what we’re looking for!

Be Clear and Concise:Keep your application straightforward and to the point. Use bullet points where possible to make it easy for us to read through your qualifications and experiences. We appreciate clarity and brevity!

Apply Through Our Website:Don’t forget to submit your application through our website! It’s the best way for us to receive your details and ensures you’re considered for the role. Plus, it shows you’re keen on joining our team!

How to prepare for a job interview at Nelly Works

Know Your Tech Inside Out

Make sure you brush up on your knowledge of data structures, algorithms, and system design. Be ready to discuss your past projects in detail, especially those that showcase your ability to build scalable systems. The more you can demonstrate your technical foundation, the better!

Showcase Your Problem-Solving Skills

Prepare to tackle some real-world problems during the interview. Think about how you would approach designing APIs or optimising database queries. Practising coding challenges can help you articulate your thought process clearly and effectively.

Understand the Company’s Product

Familiarise yourself with the AI-driven SaaS platform and its core functionalities. Being able to discuss how your skills can contribute to building and iterating on their backend services will show that you're genuinely interested and invested in the role.

Be Ready to Collaborate

Since collaboration is key in this role, think of examples where you've worked closely with frontend engineers or product teams. Highlight your communication skills and how you translate customer needs into technical solutions. This will demonstrate your ability to thrive in a fast-moving environment.