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bsport

Senior Backend Engineer – Branded App

bsport

Senior Backend Engineer at bsport responsible for backend features in a premium mobile app. Driving growth for B2B clients with scalable backend architectures and data models.

Posted 7/4/2026full-timeBarcelona • 🇪🇸 SpainSeniorWebsite

Tech Stack

Tools & technologies
DjangoPostgresPythonReactReact Native

About the role

Key responsibilities & impact
  • You'll take ownership of the backend behind a set of new member-facing gamification and engagement features in our white-labeled, premium Branded (mobile) App, shipping capabilities to 500k+ MAUs and driving growth for our B2B clients.
  • This is greenfield, high-ownership work: new services and data models built on top of a large, existing product dataset.
  • Design and build new backend services and data models that power upcoming features in our mobile app.
  • Design new relational models from the ground up: weigh architecture options, align with our Core team, and document decisions (ADRs).
  • Build and evolve the APIs / BFF endpoints consumed by the mobile app.
  • Work with large volumes of existing product data to power new experiences, including backfills and migrations on high-volume tables.
  • Treat privacy and data protection (GDPR) as a first-class concern, opt-in flows, and safe multi-tenant data handling.
  • Integrate with background/event-driven processing and notifications.
  • Ensure everything you build is scalable, reliable, and well-tested, end-to-end.

Requirements

What you’ll need
  • 5+ years of backend experience, with strong Python (Django) and PostgreSQL at scale.
  • Genuine data-modeling depth, comfortable designing new relational models and running migrations on large, high-volume tables.
  • You thrive in ambiguity taking ownership of greenfield systems from day one.
  • You explore the options, capture your reasoning in ADRs, and rally adjacent teams around a shared direction.
  • Rigorous about code quality, able to move fast without cutting corners on maintainability.
  • Strong communication skills in English.
  • Background in a startup or scale-up, ideally B2B SaaS.
  • Experience with consumer / member-facing products.
  • Experience with security- and privacy-sensitive features (GDPR, multi-tenant data isolation); able to reason about where data can leak and design against it.
  • Some React Native experience, to collaborate closely with our mobile engineers and occasionally contribute on the client side.

Benefits

Comp & perks
  • Attractive compensation package
  • Competitive salary packages based on your experience and role.
  • Hybrid model with 3 days in the office per week
  • Enjoy up to 15 days of remote work from abroad each year.
  • We offer fully-funded Alan private health coverage so you can focus on what matters most.
  • Stay active with a specially discounted access to Wellhub.
  • Enjoy tax reductions thanks to Alan Flex
  • Multicultural colleagues, after-work events, team-building & more.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
Backend DevelopmentPythonDjangoPostgreSQLData ModelingAPI DevelopmentRelational Database DesignMigrationsEvent-Driven ProcessingCode Quality
Soft Skills
Strong Communication SkillsOwnershipCollaboration