Senior Backend Software Engineer (Python) in London

Join Zepz: Breaking Down Borders, Together

Our Meaningful Mission

At Zepz, we're all about breaking down barriers for our customers and our teammates. Our purpose is deeply personal; we provide a lifeline and deliver opportunities to cross-border communities that need it most through cutting-edge finance and tech. Zepz is the power behind WorldRemit and Sendwave, driven by the mission to celebrate the incredible impact migrants have, both at home and abroad. We're not just moving money; we're building a world that truly recognises and supports global connections.

Who You'll Be Joining

We look for mission-driven builders who thrive in a fast-paced environment connected to a true purpose. We’re an always developing team of experts that enjoy problem-solving and bring clarity to tough challenges. At Zepz, we are Relentless Learners, always seeking feedback, and Responsible Owners, treating company resources like your own. We depend on Transparent Communicators who keep the team aligned through open, honest talk.

Our Core Commitments — What We Live By

• Integrity: We always do the right thing. It’s simple, but it’s the foundation of everything we build for our customers and each other.
• Outcomes: We work for our customers. Their success and prosperity are the results we focus on delivering.
• Velocity: We are fast! We maintain high energy levels and make smart decisions quickly, keeping us nimble and ahead of the curve.

Perks of Joining Our Team

We believe in empowering colleagues because we genuinely trust our team. Our culture is founded on this high trust, which naturally encourages the high ownership that drives us to meet our shared high expectations and deliver high performance. Our remote-first culture means you have the flexibility to work in your employing country wherever you feel the most focused and productive. This freedom comes with wonderful tailored, location-specific perks designed to support your whole life, not just your work. Think unlimited annual leave, great healthcare benefits, and employee discounts. We want you to thrive and focus entirely on making your biggest impact! In turn, we expect you to bring high ownership and commitment to your work. This is a place where we value trust and high performance, and we'll provide the environment and support needed for you to excel.

About the role

We are seeking a highly capable Senior Backend Software Engineer to join our Reconciliation Engineering team in the UK, specialising in data models and process automation. This role demands the ability to quickly grasp data models and queries, delivering solutions under tight deadlines, and handling pressure during incident response and audit assistance. A core responsibility is investigating and fixing the root causes of data discrepancies and mismatches between microservice systems, which ensures accuracy for regulators and auditors. You will collaborate closely with the Finance Reconciliation and Data Operations teams to automate critical manual processes, including report generation and partner statement injection/processing. A key upcoming project involves automating the complex tiered commissions system for our payout partners.

Essential skills include proficiency in SQL and DAG, with a strong preference for candidates who have previous experience in fintech or financial institutions handling reconciliation and real-time transaction data.

What you will own:

• Write great code: We understand code is read more than it’s written; better off tested and maintainability is a must.
• Help shape what we build: You’ll be working closely with product owners, designers and other engineers to design and refine our work. We work as a team and your input is key.
• Influence technology evolution: We are designing new platforms with long‑term goals in mind and are also happy to improve with new technology capabilities.
• Own delivery: We’re obsessed with shipping value; you’ll own work beyond a pull request. You’ll care about bugs, scalability, uptime and other non‑functional requirements.
• Grow together: You’ll review others' work and happily seek feedback on yours to ensure we build a better codebase and sharpen each other's skills.
• Share your knowledge and points of view: We promote knowledge sharing across our teams and count on you to become an active member of one. Experiment with new tools, present your findings, shape our future standards.

Scope and Impact:

You invent and try to simplify what we do. You insist on the highest standards from your team and yourself. You have charisma. You lead or influence a team. You tackle open‑ended somewhat ambiguous problems.

What you bring to the table:

• Strong experience in building backend services/APIs. This role specifically is for an engineer with solid experience with Python backend services. A large part of the codebase you will be working on is currently in Python.
• Strong experience in handling large volumes of data and writing ETL processes, transforming data from multiple different sources using languages/tools such as SQL, Apache Airflow, DBT, Databricks.
• Experience working in Java or open to learn as some of our services are in Java.
• Solid experience with system design and architecture.
• Experience with unit and integration tests.
• You are a system design enthusiast and have experience designing and transforming existing systems collaboratively to make them scalable, maintainable and reliable.
• You have a true DevOps mindset and are able to support your team towards becoming true owners of their product/platform.
• You work well with Engineering and Product members and are comfortable building effective relationships with stakeholders outside technology.
• An open mind with respect to diversity and inclusivity. Our team (and customers) come from all over the world.

Bonus Points if you:

• Worked at a scale startup previously.

If you want to join us in our journey to help break barriers in financial access and improve lives globally, there's no better place or time to join. Our global team of 800+ people is spread across six continents. We aspire to hire the best mix of people from former Olympians to YouTube influencers and we speak over twenty languages. This incredible diversity isn't a bonus; it's the engine that lets us serve the world.