Senior Backend Engineer, Portfolio team (Python)
About this role
About InvestEngine
We're a London-based fintech on a mission to make ETF investing simple and accessible. Over 150,000 clients have trusted us with over £3.5 billion in assets — and we're just getting started.
We've been featured by MoneyWeek, Finder and Forbes, and we're growing fast with big ambitions.
About the Role
We're looking for a Senior Backend Engineer to join our Portfolio Team and help build the core investment products our clients use every day.
The team owns portfolio creation, Managed Portfolios and related portfolio operations. This is product development work: you'll turn product ideas into reliable, well-built backend features that directly shape how clients invest.
You'll write high-quality code, raise the bar through thoughtful code reviews, contribute to architecture and lead projects from requirements to production. You'll work closely with Product, frontend, QA, mobile and design in a small, autonomous team with a clear roadmap.
What You'll Do
Design, develop and maintain backend services in Python 3.11 using Django / DRF
Build features for portfolio creation, Managed Portfolios and portfolio operations
Lead roadmap projects end-to-end: clarify requirements with Product, propose the technical design, break down the work and ship it
Design and build RESTful APIs used by our web and mobile apps
Give constructive, high-quality code reviews and help raise the team's engineering standards
Take part in architecture discussions and contribute to technical decisions
Work with MySQL and Redis
Identify and reduce technical debt
Collaborate closely with Product, frontend, QA, mobile and design
Contribute to the evolution of our architecture and engineering practices
What We're Looking For
5+ years of experience in backend development
Strong Python skills and solid software engineering fundamentals
A good understanding of software architecture and service design
Solid experience with relational databases and REST API design
A track record of writing clean, maintainable, well-tested code
Experience leading projects or features from idea to production
The ability to pick up new codebases and technologies quickly
Strong ownership, organisation and a collaborative working style
Familiarity with Git, CI/CD practices and modern engineering workflows
Good written and spoken English
Nice to Have
Experience with Django or Django REST Framework (not required, since strong fundamentals matter more than an exact framework match)
Experience in fintech, investing, wealth management or another regulated industry
Familiarity with AWS and Docker
Experience with RabbitMQ, Kafka or other message brokers
Experience using AI-assisted development tools in your daily work
Contributions to open source or personal side projects
How We Work
We're a lean, collaborative team where engineers have real influence on architecture, technical decisions and engineering culture.
The Portfolio Team is strong and autonomous. We work in two-week sprints with Product involved throughout, and we have a clear 3–6 month roadmap. You'll have the freedom to make technical decisions and own meaningful parts of the product without micromanagement or unnecessary bureaucracy.
What We Offer
Impact from day one: work on core investment products used by more than 150,000 clients
Ownership: lead projects and become the go-to backend owner for key areas of the Portfolio domain
Technical growth: influence architecture and technical decisions
Modern tech stack: Python 3.11, Django, MySQL, Redis, AWS, GitHub, TeamCity
Remote-first and flexible: work from anywhere, at your own pace
Unlimited vacation: take time off when you need it, with no fixed limits
Supportive team: thoughtful, skilled colleagues who care about quality and results
Hiring Process
HR interview
Technical interview with the Backend team
Conversation with the Portfolio team leadership
Gamified cognitive assessment to understand how you think and solve problems
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