Bjak

Android Software Engineer

United Kingdom full-time Mid Salary not listed
full-time Mid level Technology & IT Curated
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About the role

About ActAI
There are over 5 billion users using basic applications today such email, notes, tasks, calendar and they're not AI-native. Our mission is to build proactive applications for anyone in the world, who are not used to complex prompting. We aim to bring intelligence to conversations, errands, organising and workflows, with minimal prompting.
Our product focuses on achieving high reliability for long-running workflows, persistent context, and real-world task completion. We believe products will greatly reduce hallucinations
Our objective is to organise anyone's life, allowing us all to spend time on valuable and meaningful things.
Role
As an Android Software Engineer, you own the Android client experience, how AI feels, behaves, and performs on mobile devices. This is not a thin client role. You will build a production Android application where AI interactions are core to the product, and performance, reliability, and clarity matter.
Focus

Build and maintain production Android apps using Kotlin.

Integrate AI-powered features (chat, vision, voice, recommendations) via backend APIs.

Design UX patterns for AI interactions, including streaming responses, retries, and partial results.

Optimize performance, memory usage, and responsiveness for AI-heavy flows.

Implement analytics, logging, and feedback capture to support AI evaluation and iteration.

Collaborate closely with backend and ML engineers on API contracts and system behavior.

Ensure app stability, security, and scalability in production environments.

Ideal Experiences

3+ years of Android development experience using Kotlin.

Hands-on experience integrating AI features (e.g. LLM, vision, speech APIs).

Strong understanding of asynchronous programming (Coroutines, Flow).

Familiarity with REST or gRPC APIs and structured data formats.

Strong debugging and performance profiling skills.

Comfort building in environments with latency, partial failure, and non-deterministic behavior.

Experience with MLKit or light on-device inference.

Published production apps on the Google Play Store.

Outcomes

Stable, smooth, and reliable real-world use android applications.

Performance is optimized: responsive, low-latency, and efficient on memory and CPU.

Production issues are detected early, monitored effectively, and resolved with clear root-cause analysis.

Tech Stack

Kotlin / Java

SQL / noSQL

TensorFlow Lite (on-device inference)

How We Work
The best products today in the world were built by small, world class teams. We are a high talent density and hands-on team. We make decisions collectively, move at rapid speed, striking a balance between shipping high quality work and learning. Joining our team requires the ability to bring structure, exercise judgment, and execute independently. Our goal is to put in hands of our users a truly magical product
Interview process
If there appears to be a fit, we'll reach to schedule 3, but no more than 4 interviews.
Applications are evaluated by our technical team members. Interviews will be conducted via virtual meetings and/or onsite.
We value transparency and efficiency, so expect a prompt decision. If you've demonstrated the exceptional skills and mindset we're looking for, we'll extend an offer to join us. This isn't just a job offer; it's an invitation to be part of a team that's bringing AI to have practical benefits to billions globally.
Originally posted on Himalayas

Interview prep

Walk in with sharper answers.

Use this as a quick practice sheet before you speak with the employer.

Mid
Technology & IT API integration Data Analysis MySQL SQL Mid level full-time

Likely questions

  1. Tell us about work you have done that is close to the Android Software Engineer role.
  2. How would you approach your first 30 days at Bjak?
  3. Which of API integration, Data Analysis and MySQL have you used recently, and what did it help you achieve?
  4. Describe a time you solved a problem without waiting to be told exactly what to do.
  5. How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

  • A recent example that proves your experience with API integration, Data Analysis and MySQL.
  • One short story with a problem, your action, and the result.
  • Two examples that show the strengths listed on your CV.
  • A clear reason why this role and company interest you.
  • Your availability, preferred work style, and salary expectations.

Ask them

  • What would success look like in the first 90 days?
  • What are the main problems this hire should help solve?
  • How does the team give feedback and measure good work?
  • What does a normal working week look like for this role?
Practice line

I am interested in the Android Software Engineer role because I can bring practical experience in API integration, Data Analysis and MySQL, learn the team quickly, and contribute to the outcomes Bjak needs from this hire.

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