Senior Android Engineer - Mobile Core

Hi, we’re Back Market.

We’re here to help make tech reliable, affordable, and better than new. We're a global marketplace for refurbished devices, helping lower our collective environmental impact by providing trustworthy, affordable tech with 92% less carbon emissions than new.

Yep, you read that right. Turns out refurbished tech is way better for the planet than new. In fact, With every device purchased on Back Market, our positive impact on the planet grows. From our Customer Care representatives to our software engineer, every individual at Back Market cuts the planet — and consumers — a break. Our mission is simple: to do more with what we already have.

Are you ready to join us? 

The Mobile Core squad in Platform Tribe

At Back Market, we’re committed to building a top-tier m-commerce app that goes beyond simply displaying products. Our goal is to deliver an advanced, seamless user experience with ambitious new features for our mobile users in the years to come.

To support this, the Mobile Core team focuses on improving the developer experience by providing high standards, quality tooling, and robust foundations — from shared architecture and UI components to developer tools — ensuring our app scales efficiently while making it easier for Android engineers to write consistent, maintainable code.

Our second pillar is to elevate & accelerate our App Infrastructure: develop faster and more reliable CI/CD pipelines, easy release process, better QoS monitoring, and quality & profiling.

We are a diverse team with varied cultural and professional backgrounds, consisting of Senior Android and iOS Engineers alongside a Technical Lead Manager. Mobile engineers from product squads also collaborate on technical and core projects across different teams when needed.

The role & responsibilities 

We are looking for a Senior Android Engineer I to contribute to the Android core foundations, architecture & infrastructure stack. This role will be based in Paris, with 3 days in the office, 2 days remote. The engineer in this role will produce scalable libraries & frameworks, elevate engineering excellence, and share their knowledge within the Android Community at Back Market. 

You will also contribute to the mobile engineering chapter, with talented iOS & Android engineers, but also with other technical leaders from other platforms (SRE, Backend, Frontend, CyberSec, Data…). Whether passionate about Kotlin, building advanced UI with Jetpack Compose, or focused on core architecture, the engineer will work efficiently and contribute collaboratively by staying open to new ideas.

Engineering Challenges & Ownership

• Consistently delivers Android code that sets the standard for quality and maintainability, making the Android app scalable & accelerating product iterations

• Effectively contributing to technical initiatives to reach the Android engineering vision, accountable for large team project features, including ones with external dependencies.

• Ability to design code through technical conception before development, ensuring robust and efficient code patterns (Kotlin Coroutines, thread safety, and race condition prevention)

• Curiosity and proactiveness in implementing new Kotlin and Android technologies: Compose UI (migration started in 2023), Kotlin flows, and latest features announced during Google I/O.

• Build & scale our app architecture (MVVM-C or similar architectures), advocate for multi-modules, and dependency injection. Understanding and applying SOLID principles while recognizing the importance of simplicity (KISS).

• Find ways to prevent regressions, push for Unit, Integration and UI testing by collaborating with QA & Android Engineers, exploring new E2E testing practices, from native to third-party solutions.

• Elevate the Android app performance with strong monitoring practices from App launch to app size, memory usage, and smooth UI performance (Datadog, Crashlytics)

• Improve the release process with an automation mindset & practices for our CI/CD pipelines & workflows (Bitrise CI, Firebase App Distribution, GitHub Actions, Renovate, Mergify).

You’re perfect for this role if

• You are an engineer with more than 10 years of experience on Android, with some apps released on the Playstore or B2B, and some significant repo contributions on GitHub.

• You effectively advocate for technical initiatives to stakeholders. You are a spokesperson for the chapter/tribe and are mentoring senior engineers.

• You know how to build Kotlin-Compose applications with solid architecture (MVVM, Clean Architecture, modularization, dependency injection...)

• You understand the SOLID principles but also acknowledge when KISS should prevail

• You know how to design your code through technical conception before development

• You know & use reactive programming (Kotlin Flow, and optionally RxJava)

• You have strong experience with Jetpack libraries (Room, Material, etc.) and the modern Android development stack.

• You’re mindful of app security, data privacy, and user trust.

• You monitor and optimize performance (app startup time, rendering, memory usage).

• You care about accessibility, localization, and building inclusive experiences.

• You know how to handle the challenges of asynchronous and concurrent programming (Kotlin Coroutines with structured concurrency, lifecycle scope, etc)

• With the entire team, you follow and maintain the app monitoring, test & provide Quality of Service: KPIs, defining SLOs/SLIs, advanced logs, crash reporting, and dashboards (Datadog & Crashlytics).

• You are used to write E2E, integration and unit tests, and are familiar with Espresso, tests flakyness and coverage (jacoco).

• You can contribute to the scale of the integration stack: Bitrise CI, CI/CD automatization for apps (Crashlytics, Firebase App Distribution, Github Actions, Renovate)

• You continually maintain technical and functional exchanges with the iOS team🍎

• You contribute to the hiring process and help Back Market hire the best candidates

• You're an active member of the Android community (DroidCon, Meetups etc.)

• Bonus: you live for the jaw-dropping demos and surprise announcements at Google I/O

WHY SHOULD YOU JOIN US ? ✌🏼

At Back Market, we’re committed to hiring and supporting diverse teams of people from all backgrounds, experiences, and perspectives — it’s one of the reasons we’re such a high-scoring certified B Corp company (93.2).

No matter your role and seniority level, you’ll enjoy impact-driven work with hands-on career development in an innovative, driven, and fast-paced environment — with benefits to match, like: 

- A mission driven work environment where your day to day makes an impact on the planet. Seriously.

- Hybrid work environment, with 2 remote days a week and 1 remote work week per quarter, plus 3 flex days. 

- Employee Resource Groups, including mentorship programs, comprehensive accessibility policies, and cultural competency training. 

At Back Market, we strive to create a workplace that embodies the world we’re trying to change. We’ve embedded our diversity, equity, and inclusion principles into our DNA — from dedicated staff to employee resource groups to our company values. 

We know that the perfect background for a role doesn’t mean the perfect fit — we encourage you to apply for a role even if you think you may not have all the qualifications. 

If reasonable accommodations are needed for the interview process, please do not hesitate to discuss this with the Talent Acquisition Team.