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 40+ based in London, NYC and Sydney. We 10x’d our revenue in 2025.
You can read more about the company mission & values here
You’ll build and scale the systems that power our AI-driven research products and enable our operations / sales teams to deliver our product as efficiently as possible. This is a systems-level role - ideal for engineers who love thinking about data flows, orchestration, and performance across complex distributed systems.
You’ll have the opportunity to:
Ship quickly
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.
Prototype new backend capabilities (retrieval pipelines, caching layers, async task queues) that let us build faster and smarter
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
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
Are excited by the intersection of AI infrastructure, financial systems, and backend engineering
Enjoy translating business problems into clean technical systems and automation
Have worked with PostgreSQL and care about data modelling, reliability, and system design
Write production code in Python, or TypeScript
Are comfortable building APIs, internal tools, workflows, and infrastructure that support real customers
Thrive in fast-moving startup environments and enjoy shipping quickly while maintaining strong engineering standards
Bonus points for experience working on:
Billing, payments, usage-based pricing, or financial workflows
Internal infrastructure / dev tools at startups
Data pipelines, workflow orchestration, or event-driven systems
Retrieval, embeddings, or prompt orchestration
Why Junior
Top 1% traction: 0-20+ m rev in 3 years, fully bootstrapped / profitable, top-tier customers inc. some of MBB, Big 4, Top 5 PE mega-funds
Flat org structure: lean startup environment – every engineer reports directly to the CTO / co-founder
Competitive salary + equity and first-class benefits inc:
Lunch + dinner provided in-office
Third Space membership
Private health insurance
Multiple all-expense paid offsites per year (last 3 trips include Crete, Greece; Cancun, Mexico; Barcelona, Spain)
Visa sponsorship available
Junior leverages the power of generative AI to help deal teams and their advisors collaborate more effectively, uncover deeper insights, and accelerate their path to output.
Our platform is purpose-built for the diligence process, with custom workflows that streamline how teams extract, structure, and analyze information.
We deliver:
• Best-in-class transcription with structured extraction of expert call insights
• Instant key takeaways automatically generated after each call
• Intelligent search across transcripts to pinpoint relevant insights fast
• Quantitative tracking to monitor findings across interviews
• Custom GPT-based synthesis that lets you query and summarize expert input at scale
By integrating seamlessly into your workflow, Junior transforms raw information into actionable intelligence - quickly, accurately, and securely.
