# Senior Android Developer (f/m/d) at adjoe

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Own design, development and optimization

- **Company:** adjoe (https://jobs.trythestack.co/companies/adjoe)
- **Location:** Hamburg, Germany
- **Work arrangement:** Hybrid
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Android, Kotlin, SDK development, API design, Multithreading, ProGuard, R8, gRPC, Protobuf, OkHTTP, Gradle, GitLab CI, Sentry, Kibana, AWS
- **Posted by employer:** 2026-09-04
- **Added to The Stack:** 2026-09-05
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://jobs.ashbyhq.com/adjoe/eafc53f1-a5ef-421f-b554-a861e55c0bed (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/senior-android-developer-fmd-adjoe

## About the role

Responsibilities:
- Own design, development and optimization of the Android SDK (Kotlin) to ensure stability and low footprint inside third-party apps.
- Implement and maintain high-performance networking and API integrations (gRPC, Protobuf, OkHTTP) with strict backward compatibility.
- Profile and optimise CPU, memory and battery usage; apply ProGuard/R8 and other release-time optimisations.
- Build observability and diagnostics into the SDK using Sentry, Kibana and AWS tooling; investigate incidents at scale.
- Maintain CI/CD pipelines for SDK releases, write integration tests, and collaborate closely with backend, analytics and product teams.

Requirements:
- 8+ years Android experience or 3+ years focused on SDK/library development with deep Kotlin and Android internals expertise.
- Strong knowledge of multithreading, lifecycle management, performance profiling and ProGuard/R8 optimisations.
- Hands-on experience with networking stacks (gRPC/Protobuf/OkHTTP), API design and backward-compatibility strategies.
- Experience with CI pipelines (GitLab CI), observability tools (Sentry/Kibana) and AWS services used for diagnostics.
- Attention to detail, ability to work across teams and experience shipping reliable SDKs at scale; NDK/JNI knowledge is a plus.

## Responsibilities

You will own the core development and optimization of the adjoe Ads SDK to ensure high performance and stability across millions of devices. Additionally, you will collaborate with backend teams to design APIs and maintain CI/CD pipelines for efficient SDK delivery.

## Requirements

The role requires 8+ years of Android experience or 3+ years in SDK/library development with deep expertise in Kotlin and Android internals. Candidates must have a strong track record in high-performance network design and resource-constrained optimization.

## FAQ

- **Is this Senior Android Developer (f/m/d) role still open?** It was posted on 2026-09-04. Listings more than 30 days old may no longer be active, so check adjoe's site before applying.
- **Does adjoe offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on adjoe's site.
- **Where is this role located?** The listing gives the location as Hamburg, Germany. It is marked hybrid.
- **What skills does this role ask for?** The listing names: Android, Kotlin, SDK development, API design, Multithreading, ProGuard, R8, gRPC, Protobuf, OkHTTP, Gradle, GitLab CI, Sentry, Kibana, AWS.

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## Notes for agents

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