At a Glance
- Tasks: Design and build systems for AI-driven investment research tools.
- Company: Join a profitable, innovative tech company with a dynamic team.
- Benefits: Enjoy private health insurance, gym membership, and exciting team offsites.
- Other info: Work from our vibrant Farringdon office and shape our engineering culture.
- Why this job: Make a real impact in a fast-paced startup environment with cutting-edge technology.
- Qualifications: 4+ years backend engineering experience, strong skills in Python or TypeScript.
The predicted salary is between 70000 - 90000 € per year.
We’re building cutting-edge LLM-powered workflow tools to supercharge investment research for private market investors. Our clients include most of the global top 10 private equity and consulting firms - Junior already powers hundreds of billions of dollars invested annually. We’re a profitable, bootstrapped company with a growing team of 30+ based in London, NYC and Sydney.
You’ll design and build the systems that support our AI-driven research platform along with our commercial, product, and operations teams — automating workflows, improving decision-making, and enabling the company to move significantly faster. This is a high-ownership backend engineering role (~4+ years experience) where you’ll work across data pipelines, integrations, automation, and internal infrastructure.
You’ll have the opportunity to:
- Architect and scale backend systems that support high-throughput LLM interactions, vector search, and multi-agent orchestration.
- Stitch together AI infrastructure across model providers, data stores, and internal APIs to create cohesive, performant systems.
- Own the architecture of internal data systems and pipelines.
- Build automation and integrations across product, CRM, and financial systems.
- Help shape engineering culture and internal infrastructure decisions.
Example Projects You’ll Work On:
- Customer Health Intelligence System: Design data pipelines that consolidate product usage, CRM data, and user feedback into a unified system of record. Build automated signals and alerts that detect churn risk, usage drops, or emerging product issues - enabling the team to act quickly.
- User Feedback → Product Development Pipeline: Build internal tooling that processes feedback calls with users. Use LLMs to extract themes, cluster feature requests, and surface the most important insights to the product team.
- Billing & Revenue Infrastructure: Design systems to support complex B2B pricing models — combining usage-based, seat-based, and platform fees. Automate invoicing, reconciliation, and financial reporting.
- Internal Data Platform: Build and own our internal data platform, integrating product telemetry, CRM data, and financial systems. Create reliable pipelines and APIs that power reporting, automation, and decision-making across the company.
We’re looking for a Backend Engineer who enjoys building systems that make a company run better. You might be a good fit if you:
- Are based in London and excited to work from our Farringdon office (5 days/week).
- Have experience owning technical projects end-to-end, from architecture through production.
- Enjoy translating business problems into clean technical systems and automation.
- Like building high-leverage internal platforms that make teams dramatically more efficient.
- Have strong experience with PostgreSQL and modern data platforms (Snowflake, BigQuery, Databricks, Firebolt, etc.).
- Write production code in Python, or TypeScript.
- Thrive in fast-moving startup environments and enjoy shipping quickly while maintaining strong engineering standards.
Bonus: Experience building AI-enabled workflows, automation systems, or internal developer platforms.
Benefits:
- Private health insurance.
- Gym membership (Third Space).
- Dinner when working late.
- Frequent team offsites (Crete, Upstate NY, Cancun).
Senior Backend Engineer - London employer: Junior AI
At Junior, we pride ourselves on being an innovative employer that fosters a dynamic and collaborative work culture in the heart of London. Our commitment to employee growth is evident through our high-ownership roles, where you can take charge of impactful projects while enjoying benefits like private health insurance, gym memberships, and exciting team offsites. Join us to be part of a rapidly growing company that values your contributions and offers a unique opportunity to shape the future of AI-driven investment research.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Backend Engineer - London
✨Tip Number 1
Network like a pro! Reach out to folks in your industry on LinkedIn or at meetups. A personal connection can often get your foot in the door faster than a CV ever could.
✨Tip Number 2
Show off your skills! If you’ve got a portfolio or GitHub with projects that highlight your backend engineering prowess, make sure to share it during interviews. It’s a great way to demonstrate what you can bring to the table.
✨Tip Number 3
Prepare for technical interviews by practicing coding challenges and system design questions. We recommend using platforms like LeetCode or HackerRank to sharpen your skills and boost your confidence.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love seeing candidates who are genuinely interested in joining our team!
We think you need these skills to ace Senior Backend Engineer - London
Some tips for your application 🫡
Show Your Passion for Backend Engineering:Let us see your enthusiasm for backend systems! Share specific projects where you've designed and built systems that improved efficiency or solved complex problems. We love seeing how you translate business needs into technical solutions.
Tailor Your Application:Make sure to customise your CV and cover letter for this role. Highlight your experience with PostgreSQL, Python, and any relevant data platforms. We want to know how your skills align with our mission of building cutting-edge tools!
Be Clear and Concise:When writing your application, keep it straightforward. Use clear language and avoid jargon. We appreciate a well-structured application that gets straight to the point while showcasing your expertise and experience.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows you’re keen on joining our team at StudySmarter!
How to prepare for a job interview at Junior AI
✨Know Your Tech Stack
Make sure you’re well-versed in the technologies mentioned in the job description, especially PostgreSQL and Python or TypeScript. Brush up on your knowledge of modern data platforms like Snowflake or BigQuery, as you might be asked to discuss how you've used them in past projects.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific examples where you've translated business problems into technical solutions. Think about times when you’ve built systems that improved efficiency or automated workflows, as this aligns perfectly with what they’re looking for.
✨Understand Their Mission
Familiarise yourself with Junior's mission and values. Being able to articulate how your experience and goals align with their objectives will show that you’re genuinely interested in the role and the company.
✨Ask Insightful Questions
Prepare thoughtful questions about the team dynamics, engineering culture, and upcoming projects. This not only shows your interest but also helps you gauge if the company is the right fit for you.
