At a Glance
- Tasks: Lead the design of our cutting-edge analytics platform and solve complex real-world problems.
- Company: Join Cassini, a leading provider of analytics tools for the derivatives industry.
- Benefits: Competitive salary, continuous learning, and impactful work with top financial institutions.
- Other info: Dynamic environment with opportunities for mentorship and career growth.
- Why this job: Shape the future of finance technology while working with a talented team.
- Qualifications: Proven experience in senior technical roles and strong problem-solving skills required.
The predicted salary is between 80000 - 100000 £ per year.
We are seeking a Principal Engineer (Platform Architecture) to help lead the design and evolution of our market-leading analytics platform, shaping technical direction while solving complex, real-world problems at scale.
About us: Founded in 2014, Cassini is the established, core utility provider of analytics and optimization tools for the derivatives industry. Trusted by hedge funds, asset managers, and banks worldwide, our platform delivers real-time, front-to-back insight into the full cost of derivatives trading. Our award-winning platform empowers clients to reduce margin, optimize collateral, and enhance their liquidity risk framework.
What sets us apart?
- Recognised as 'Best Derivatives Tech Provider' and 'Analytics Leader’
- Global impact with a rapidly expanding footprint
- Analytics provider to the largest asset managers in the world
- Enterprise-grade security (ISO 27001 & SOC-2)
- Seamless integration with OMS, EMS, and collateral systems
At Cassini, our client focus drives everything we do. You’ll work alongside experienced engineers, product specialists, and domain experts, tackling complex, real-world problems at the intersection of finance and technology. We offer challenging work, continuous learning, and the opportunity to have real impact on a platform used by leading financial institutions every day.
Role: In this role, you will ensure we build the right things, the right way. You will report to the Head of Technology.
Core Responsibilities:
- Own and govern technical design and architecture across multiple development teams, defining standards, reviewing solution designs, and ensuring alignment with the broader platform vision.
- Provide hands-on architectural leadership, guiding complex design decisions and supporting teams through critical implementations and production challenges.
- Partner closely with senior stakeholders to balance technical strategy, delivery needs, and long-term platform health.
- Champion the adoption of agentic and AI-native workflows, embedding them in the core engineering lifecycle.
- Act as a primary technical point of contact for both internal and external stakeholders.
- Identify and proactively address technical debt, risk, and cross-team dependencies, influencing roadmap planning and long-term platform health.
- Mentor senior developers and tech leads, raising the overall architectural and engineering bar across the organisation.
- Ensure non-functional requirements (performance, scalability, security, and resilience) are embedded from the outset.
Tech Stack: We work with a modern stack designed for scale, reliability, and developer productivity. You don’t need to be an expert in every tool listed below, but you should have strong experience with most of them or equivalent technologies.
Core Languages & Frameworks:
- Python (Flask, SQLAlchemy, NumPy, Pandas) for services and analytics
- React, Typescript, Redux for the front end
Cloud & Infrastructure:
- AWS (ECS, Lambda, RDS, S3)
- Docker
- Linux
Data, Messaging & Caching:
- MySQL
- RabbitMQ
- Redis
Tooling & DevOps:
- GitLab for source control and CI/CD
AI & Automation:
- AI Agents & Assistants used to enhance analytics, internal tooling, and developer productivity
Required Qualifications & Experience:
- University degree in a STEM subject from a reputable institution
- Proven experience in a senior technical role such as Principal Engineer, Technical Architect, or equivalent position working with complex analytical system design
- Track record of owning, shaping and governing architecture across multiple teams and large-scale platforms
- Experience working with modern distributed and cloud-based systems
- Familiarity with our tech stack or equivalent technologies
Skills & Competencies:
- Excellent architectural judgement, with the ability to balance short-term delivery needs against long-term technical strategy
- Strong problem-solving skills, particularly in complex, ambiguous, or high-impact technical scenarios
- Ability to communicate complex technical concepts clearly to both technical and non-technical stakeholders
- Ability to influence and drive technical direction and architectural decisions at a senior level
- Collaborative mindset, with the ability to work effectively across teams and senior stakeholder groups
- Pragmatic and outcome-focused, with a strong sense of ownership and accountability
Principal Engineer (Platform Architecture) in London employer: Cassini Systems
At Cassini, we pride ourselves on being an exceptional employer in the financial services sector, offering a dynamic work environment that fosters collaboration and innovation. Our London-based team enjoys a culture of continuous learning, with ample opportunities for professional growth and development, while working on cutting-edge technology that shapes the future of liquidity risk management. With a strong focus on employee empowerment and a commitment to excellence, we ensure that our staff are not only challenged but also supported in reaching their full potential.
StudySmarter Expert Advice🤫
We think this is how you could land Principal Engineer (Platform Architecture) in London
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at Cassini Systems or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to Cassini Systems.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like Cassini Systems.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like Cassini Systems that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Principal Engineer (Platform Architecture) in London
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Cassini Systems.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Cassini Systems and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at Cassini Systems
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Cassini Systems uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
