Head of Custom Index Solutions
Define a new category in retail investing. Own the investment thesis that everything else hangs off.
About Arithmos
Arithmos is building the retail layer for direct indexing. We turn a plain-English idea into a transparent, rule-based portfolio with institutional-grade backtesting and analytics. Our goal is to make structured investing accessible to millions.
The role
You will own the investment layer of Arithmos — how indices are constructed, how they are presented, and how users trust and adopt them. This is a senior leadership role combining quant expertise, product thinking, and client-level communication.
What you’ll do
Define index construction frameworks
- Thematic indices (AI, energy, defence, etc.)
- Factor-based and rule-based strategies
Oversee portfolio methodology
- Weighting logic
- Rebalancing strategies
- Constraints and optimisation
Ensure outputs are institutionally credible and transparent
- Every published index traceable back to its rules
- Every metric defined and reproducible
Partner with product and engineering
- Translate investment logic into scalable systems
- Shape how Arithmos communicates investing — simplify complex strategies into intuitive outputs
Act as a public-facing authority
- Content, thought leadership, partnerships
- Represent Arithmos in institutional conversations
Requirements
- 7–15+ years in hedge fund / asset management / quant research
- Strong background in portfolio construction, index design, and systematic investing
- Proven ability to translate complex strategies into clear frameworks
- Strong communication skills (both technical and non-technical)
Nice to have
- Experience building or managing index products
- Experience working with institutional clients
- Public presence (content, speaking, publishing)
Why this role is exceptional
- Define a new category in investing (retail direct indexing)
- High ownership over product + investment strategy
- Significant equity upside tied to company growth
- Opportunity to become a recognised voice in modern portfolio construction
Compensation & benefits
- Private healthcare
- 25 days holiday + bank holidays
- Top-tier equipment
- Flexible working
- Annual company offsite
How to apply
Upload your CV and a short note — no more than 200 words — on why this role in particular. If you have work you’re proud of that’s relevant (a product you shipped, a research paper, a backtest you ran), link to it. Two-stage process: screening call, then a take-home + technical deep-dive with the team you’d join.
