Full Stack Engineer

Full Stack Engineer

Full-Time 70000 - 90000 £ / year (est.) Home office (partial)
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At a Glance

  • Tasks: Build an AI-powered litigation platform from scratch and shape its technical foundation.
  • Company: Join Litmas.ai, a pioneering tech company transforming legal workflows.
  • Benefits: Competitive salary, equity package, hybrid work, and professional growth opportunities.
  • Other info: Dynamic role with significant ownership and career advancement potential.
  • Why this job: Make a real impact in the legal tech space while collaborating with founders.
  • Qualifications: 5+ years in full-stack development with expertise in Python, Node.js, and AI systems.

The predicted salary is between 70000 - 90000 £ per year.

About Litmas.ai

LITMAS is an AI-powered litigation platform that streamlines litigation workflows, enabling lawyers and legal teams to manage cases more efficiently from intake through resolution. We're seeking a Founding Full Stack Engineer to join our core team and shape the technical foundation of LITMAS. This is an opportunity to build a product from the ground up, working directly with the founders to create technology that supports attorneys in their legal practice. As a founding engineer, you'll have significant ownership over our technical architecture, product decisions, and engineering culture.

This is a full-time, hybrid position for candidates based in London. You are required to be in the UK office 3 days a week.

Key Responsibilities
  • Architect and build core platform features using Python, Node.js, Next.js, React, and MongoDB
  • Design and implement production-grade LLM systems with advanced tool usage, RAG pipelines, and agent architectures
  • Build AI workflows that combine multiple tools for legal research, validation, and document analysis
  • Create scalable RAG infrastructure to handle thousands of legal documents with high accuracy
  • Implement AI tool chains to provide agents with tool inputs
  • Design intuitive interfaces that make complex legal workflows simple and powerful
  • Own end-to-end features from conception through deployment and iteration
  • Establish engineering best practices for AI systems including evaluation, monitoring, and safety
  • Collaborate directly with founders on product strategy and technical roadmap
Required Qualifications
  • Deployed production-grade LLM applications with demonstrable experience in:
    • Tool usage and function calling
    • RAG (Retrieval-Augmented Generation) implementation at scale
    • Agent architectures and multi-step reasoning
    • Prompt engineering and optimization
    • Knowledge of multiple LLM providers (OpenAI, Anthropic, Cohere, open-source models)
  • Experience building AI evaluation and monitoring systems
  • Experience with document processing and OCR technologies
  • 5+ years of production experience with Node.js, Python, Next.js, and React
  • Strong MongoDB expertise including schema design and optimization
  • Experience with vector databases (Pinecone, Weaviate, Qdrant, or similar)
  • Full-stack development capabilities with ability to own features from database to UI
  • Track record of shipping complex web applications at scale
  • Deep understanding of LLM limitations, hallucination prevention, and validation techniques
What We Offer
  • Competitive salary and equity package
  • Opportunity to shape the technical direction of a category-defining product
  • Direct collaboration with founders on product and company strategy
  • Hybrid work environment
  • Professional development opportunities
To Apply

Please submit 1) your resume 2) links to relevant projects or GitHub repos and 3) a brief note on the most challenging AI/LLM problem you've solved in production. Send your application materials via email to careers@litmas.ai with the subject line "Founding Full Stack Engineer - [Your Name]" or DM us directly on LinkedIn with your application materials.

Full Stack Engineer employer: Litmas.ai

At Litmas.ai, we pride ourselves on being an innovative employer that empowers our team members to take ownership of their work and shape the future of legal technology. With a competitive salary and equity package, a hybrid work environment, and direct collaboration with founders, we offer a unique opportunity for professional growth and meaningful contributions in the heart of London. Join us to be part of a dynamic culture that values creativity, technical excellence, and the drive to redefine litigation workflows.

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Contact Details:

Litmas.ai Recruitment Team

StudySmarter Expert Advice🤫

We think this is how you could land Full Stack Engineer

Tip Number 1

Network like a pro! Reach out to folks in the industry, attend meetups, and connect with potential colleagues on LinkedIn. The more people you know, the better your chances of landing that Full Stack Engineer role.

Tip Number 2

Show off your skills! Create a portfolio showcasing your projects, especially those involving Python, Node.js, and AI workflows. This will give you an edge when chatting with founders about your experience.

Tip Number 3

Prepare for technical interviews by brushing up on your knowledge of LLMs and RAG implementations. Practice coding challenges and be ready to discuss your past projects in detail—this is your chance to shine!

Tip Number 4

Don’t forget to apply through our website! It’s the best way to ensure your application gets seen. Plus, it shows you’re genuinely interested in being part of the Litmas.ai team.

We think you need these skills to ace Full Stack Engineer

Python
Node.js
Next.js
React
MongoDB
LLM Systems Design
RAG Implementation

Some tips for your application 🫡

Tailor Your Resume:Make sure your resume highlights the skills and experiences that align with the Full Stack Engineer role. We want to see how your background in Python, Node.js, and React can contribute to our mission at Litmas.ai.

Showcase Your Projects:Include links to relevant projects or GitHub repos that demonstrate your expertise in building production-grade LLM applications. This is your chance to show us what you can do!

Tackle the AI Challenge:In your brief note, share the most challenging AI/LLM problem you've solved in production. We’re keen to understand your thought process and how you approached complex issues.

Apply Through Our Website:We encourage you to send your application materials via email to careers@litmas.ai. Make sure to use the subject line 'Founding Full Stack Engineer - [Your Name]' so we can easily find your application!

How to prepare for a job interview at Litmas.ai

Know Your Tech Stack Inside Out

Make sure you’re well-versed in the technologies mentioned in the job description, like Python, Node.js, and React. Brush up on your knowledge of LLM systems and RAG pipelines, as these will likely come up during technical discussions.

Showcase Your Projects

Prepare to discuss your previous projects, especially those involving AI and full-stack development. Bring along links to your GitHub repos or any relevant work that demonstrates your experience with complex web applications and document processing.

Understand the Company’s Vision

Research Litmas.ai and understand their mission to streamline litigation workflows. Be ready to share how your skills can contribute to building a product that supports attorneys, showing that you’re aligned with their goals.

Prepare for Problem-Solving Questions

Expect to tackle some challenging questions related to AI/LLM problems. Think about the most complex issues you've faced in production and be ready to explain your thought process and solutions clearly.