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, offering a dynamic work environment where innovation meets collaboration. Our culture fosters continuous learning and professional growth, empowering employees to tackle complex challenges in the finance and technology sectors. With a focus on impactful projects and a commitment to employee well-being, we provide a unique opportunity to contribute to a market-leading analytics platform while enjoying the benefits of a supportive and forward-thinking workplace.
StudySmarter Expert Advice🤫
We think this is how you could land Principal Engineer (Platform Architecture) in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the industry, especially those who work at Cassini or similar companies. A friendly chat can lead to insider info about the role and even a referral!
✨Tip Number 2
Prepare for technical interviews by brushing up on your architectural design skills. Be ready to discuss how you've tackled complex problems in the past and how you can apply that experience to our platform.
✨Tip Number 3
Showcase your passion for the tech stack we use! Familiarise yourself with Python, AWS, and other tools mentioned in the job description. Being able to speak confidently about them will definitely impress us.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re genuinely interested in joining our team at Cassini.
We think you need these skills to ace Principal Engineer (Platform Architecture) in London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV reflects the skills and experiences that align with the Principal Engineer role. Highlight your experience with complex analytical systems and any relevant technologies from our tech stack.
Craft a Compelling Cover Letter:Use your cover letter to tell us why you're passionate about platform architecture and how your background makes you a great fit for our team. Be sure to mention specific projects or achievements that showcase your architectural judgement.
Showcase Problem-Solving Skills:In your application, give examples of how you've tackled complex technical challenges in the past. We love seeing how candidates approach problem-solving, especially in high-impact scenarios.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows you’re keen on joining our team!
How to prepare for a job interview at Cassini Systems
✨Know Your Tech Stack
Familiarise yourself with the core languages and frameworks mentioned in the job description, especially Python, React, and AWS. Be ready to discuss your experience with these technologies and how you've used them in past projects.
✨Showcase Your Architectural Judgement
Prepare examples that demonstrate your ability to balance short-term delivery needs with long-term technical strategy. Think of specific scenarios where you made critical architectural decisions and how they impacted the project.
✨Communicate Clearly
Practice explaining complex technical concepts in simple terms. You’ll need to communicate effectively with both technical and non-technical stakeholders, so being able to break down jargon is key.
✨Emphasise Collaboration
Highlight your experience working across teams and with senior stakeholders. Share stories that illustrate your collaborative mindset and how you’ve influenced technical direction in previous roles.
