Senior Backend Engineer - London
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👶 About Junior
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. We 10x’d our revenue in 2025.
You can read more about the company mission & values here.
💡 Role Description
You’ll design and build the systems that support our you’ll help build and scale the systems that power 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.
🔥 About You
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 🇲🇽)