Senior Python Developer

TreasurySpring; Greater London; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A growing fintech company in Greater London seeks a Senior Python Developer to join its technology team. This role requires over 5 years of experience in developing complex applications, ideally using Python. You'll play a critical role in designing mission-critical systems and mentoring junior developers. The company offers competitive salaries, equity schemes, unlimited paid leave, and a hybrid working environment, making it an attractive opportunity for technology enthusiasts focused on innovative financial solutions.

Benefits

Competitive salary

Equity and bonus scheme

Unlimited Paid Leave

Hybrid office-working model

Enhanced Parental Leave

Workplace Pension

Complete HealthCare Cover

Life Insurance

Remote Office set-up budget

Cycle to Work Scheme

Team-building activities

Qualifications

• 5+ years experience developing applications in an OO language, ideally Python.
• Experience with testing automation and CI/CD is preferred.
• Strong aptitude for learning and adapting.

Responsibilities

• Designing and developing systems for trading and investment operations.
• Mentoring less-experienced developers.
• Optimising Python applications for performance.

Skills

Developing complex applications using Python

Experience with CI/CD

Excellent communication

Problem-solving skills

Education

Strong STEM degree

Tools

Python 3

Postgres

TypeScript

React

Job description

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TreasurySpring is the product of an obsession with fixing the fundamental structural problems in money markets. Our fascination with the sector began painfully, during the Global Financial Crisis of 2008, where we had a front-row seat to watch the evaporation of liquidity in fixed income and the near collapse of the entire short-dated funding markets.

We have been on a mission to help deliver more sustainable solutions for the money markets ever since, and we launched TreasurySpring in 2018 to offer institutional clients a single gateway to the broadest range of the best risk‑adjusted cash investment options. As a fast‑growing London‑based financial technology company, we deliver a unique solution to a global multi‑trillion‑dollar problem, delivered globally from our offices in London and New York.

Our regulated Fixed‑Term Fund platform delivers new digital pipelines to connect cash‑rich firms to institutional borrowers. Clients include large Private Equity funds, Asset Managers, listed Corporates, high‑growth tech companies and many more.

Learn more about why we do what we do here.

Senior Python Developer

Join our lean UK‑based technology team as a Senior Python Developer, where you'll play a pivotal role in the development of our systems. Working closely with the CTO and Head of Software Engineering, you'll have the opportunity to make a significant impact within our growing fintech business. This role offers the flexibility of remote work alongside visits to our offices in Mayfair, London.

Our proprietary technology platform handles billions of dollars worth of our customers' investments every day, capturing all client orders and managing the entire investment cycle. Our backend services are built in typed Python3, backed by a Postgres database. This includes a proprietary workflow engine built around a Scheme‑based workflow notation.

Our frontend systems include our clean, simple web portal for client order capture and reporting, built in TypeScript and React; with server‑side REST and GraphQL APIs written in Python3.

What we’re looking for…

Essential skills and experience:

• 5+ years experience of developing complex applications using an OO language (ideally Python, but experience in C++ / C# / Java / etc would also be considered)
• Experience working on mission‑critical applications, following a robust SDLC
• Excellent communication and problem‑solving skills; and a strong aptitude for learning
• Experience and enthusiasm for test‑automation and CI/CD
• Strong STEM degree or equivalent professional experience

Desirable skills:

• Deep knowledge of Python, including any of the frameworks we currently use: Flask, SqlAlchemy, Alembic, Pydantic
• Experience with relational databases, ideally Postgres
• Experience of message‑based architectures, and queuing technologies, i.e. RabbitMQ
• Experience of REST and/or GraphQL APIs
• Knowledge of the core AWS services: i.e. EC2 / ECS, RDS, S3
• Experience using DataDog or similar observability tools
• Knowledge of containerisation: Docker, Kubernetes, AWS Fargate etc
• Any experience of front‑end or fullstack development using TypeScript & React
• Experience building software for financial services and/or investment management organisations

We don't expect candidates to have knowledge of all of the above, but we hope you're keen to learn!

What you’ll do: Responsibilities

• Designing and developing mission‑critical systems and applications that support our trading and investment operations, and our client‑facing products.
• Analysing requirements, proposing solutions, and designing software components and systems.
• Writing high‑quality, efficient, and maintainable code.
• Participating in code reviews, providing feedback to other team members and ensuring that coding standards and best practices are followed throughout the development process.
• Mentoring and coaching less‑experienced developers, helping them improve their skills, learn best practices, and grow professionally.
• Communicating effectively with stakeholders to understand requirements and provide updates on project progress.
• Optimising the performance of Python applications, identifying bottlenecks and inefficiencies and implementing solutions to improve scalability, responsiveness, and efficiency.
• Staying updated on the latest trends, technologies, and best practices in Python development and software engineering.

What we offer: Benefits

• Competitive salary, depending on experience
• Equity and bonus scheme
• Unlimited Paid Leave
• Hybrid office‑working model – we're in a great location near Green Park station in London
• Enhanced Parental Leave and Pay
• Workplace Pension
• Complete Bupa HealthCare Cover
• Life Insurance
• Income Protection Insurance
• Access to Yulife (Employee Assistance Programme)
• Remote Office set‑up budget
• Cycle to Work Scheme
• A fun and dynamic working environment with regular team‑building activities and events