At a Glance
- Tasks: Design and maintain cutting-edge backtesting infrastructure for innovative investment solutions.
- Company: Join Arithmos, a pioneering firm transforming structured investing for everyone.
- Benefits: Competitive salary, equity options, private healthcare, and flexible working arrangements.
- Other info: High autonomy and career growth in a dynamic, tech-driven environment.
- Why this job: Make a real impact by building a retail-grade quant engine at the forefront of finance.
- Qualifications: 3–8+ years in quant or data engineering with strong Python skills.
- ← all rolessenior
- Full-time
- Open role
- Arithmos
- Data / Quant Engineer
Build the back-testing engine and portfolio-construction intelligence that every Arithmos claim depends on.
- London (hybrid) or Remote (UK/EU) Full-time £200,000–£220,000 base
- performance bonus
- 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 build the core intelligence layer of Arithmos. Every index, every backtest, and every performance claim depends on the accuracy and robustness of your work.
- What you’ll do
- Design and maintain backtesting infrastructure
- Historical simulations across equities
- Handling corporate actions, survivorship bias, rebalancing
- Build portfolio construction logic
- Weighting systems (equal-weight, factor-based, custom rules)
- Constraint handling (sector, geography, liquidity)
- Develop performance and risk metrics
- Volatility, drawdowns, Sharpe/Sortino
- Benchmark comparisons (S&P 500, custom benchmarks)
- Improve data pipelines
- Pricing data ingestion
- Cleaning, validation, and consistency checks
- Work closely with product
- Ensure outputs are accurate, explainable, and trustworthy
Requirements
- 3–8+ years in quant, data engineering, or systematic investing
- Strong Python (Num Py, Pandas)
- Deep understanding of portfolio construction, backtesting pitfalls, and financial data structures
- Experience working with large datasets efficiently
- Nice to have
- Experience in hedge funds, asset management, or quant shops
- Knowledge of factor models or systematic strategies
- Experience building user-facing quant tools
- Why this role is exceptional
- You define the credibility of the product
- Opportunity to build a retail-grade quant engine
- Work at the intersection of AI + investing + product
- High autonomy, high impact, high upside
Compensation & Benefits
- performance bonus
- Private healthcare
- 25 days holiday + bank holidays
- Top-tier equipment
- Flexible working
- Annual company offsite
Arithmos is an equal-opportunity employer.
Published 24 April 2026.
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Design and maintain backtesting infrastructure in Harrow employer: Arithmos
Arithmos is an exceptional employer that empowers its employees to shape the future of investing through innovative technology. With a strong focus on autonomy and impact, team members enjoy competitive compensation, private healthcare, and flexible working arrangements, all while contributing to a mission that makes structured investing accessible to millions. The collaborative work culture fosters growth and creativity, making it an ideal environment for those passionate about quant engineering and finance.
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