Senior Backend Engineer, Portfolio team (Python)

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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