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May 18, 2026

Senior Software Engineer, Android - KMP

Senior • Hybrid

18,900 - 29,500 PLN

Warsaw, Poland

About the team

SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools.

Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones.

As a Senior Android Developer, you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers.

About the role

We’re evolving toward a Kotlin Multiplatform (KMP) strategy, enabling shared development across Android and iOS. In this role, you’ll learn, refine, and help implement this technology, shaping the future of our mobile apps.

You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. 

This role will be a B2B based role in Warsaw.

What you’ll do

  • Build new features for the item catalog within the SumUp SuperApp

  • Help improve the architecture of the application and contribute to our Kotlin Multiplatform strategy

  • Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions

  • Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making

  • Write thorough documentation and implement robust testing for features before shipping

  • Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms

You’ll thrive in this role if:

  • You have 8**+ years experience in mobile engineering with Android and Kotlin.**

  • You have 2+ years of experience working with Jetpack Compose.

  • You have a solid understanding of software design patterns (e.g., MVVM, MVI) and expertise in building modular, scalable app architectures.

  • You have good knowledge of reactive programming (Flow, Coroutines and Concurrency).

  • You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests.

  • You strive for clean code, and you are flexible to balance pragmatism and perfection.

  • You have a keen interest in multi-platform development using Kotlin Multiplatform.

Why You Should Join SumUp (Warsaw) 🇵🇱

🌎 Opportunity to work , from our vibrant Warsaw office with inspiring art-filled lounges and a skyline terrace in the Mennica Legacy Tower. 

🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 

🚀 Enrolment onto our VSOP program: you will own a stake in SumUp’s future success 

🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 

🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 

💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 

🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days 🌴 Break4me: 1-month sabbatical after 3 years of service 

🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team

Job Application Tip

We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

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Remote

Krakow, Poland

🏢 Summary: Senior Android Engineer role focused on building reliable mobile integrations that ingest, unify, and expose health data from on-device and third-party sources. The position works across Android and backend boundaries to deliver secure, stable end-to-end data flows with backend, QA, and product teams. 🗂️ Requirements: 5+ years building, shipping, and maintaining mobile apps, Senior-level Android development expertise, Kotlin and Jetpack Compose production experience, Android architecture, performance, debugging, and stability expertise, Platform API, third-party SDK, and backend service integration experience, REST API, asynchronous data flow, coroutines, and Flow experience, Incremental delivery, pragmatic testing, refactoring, and risk management discipline 📃 Skills: Android, Kotlin, Compose, REST, Coroutines, Flow, APIs, SDKs, Debugging, Testing, Refactoring 🏢 Description: We are looking for a Senior Android Engineer to build and harden the mobile client integrations that bring health data into the client’s application — including on-device and third-party health data sources — and to expose that data cleanly to the product teams that consume it. We are looking for a proactive and self-sufficient person, able to navigate complex integration work across mobile and backend boundaries, unblock themselves quickly, and collaborate closely with backend, QA, and partner teams. Responsibilities Build and maintain Android client integrations for ingesting and unifying health data from on-device and third-party sources Integrate with Google Health Connect and external health data providers, handling permissions, sync, and data quality Expose health data cleanly to product teams through shared, well-documented client interfaces Partner with backend, QA, and consuming product teams to deliver reliable end-to-end data flows Ensure quality and safety through incremental rollouts, with a strong focus on stability and performance Requirements Senior Android engineer with 5+ years building, shipping, and maintaining mobile apps Deep expertise in Android development, including architecture, performance, debugging, and stability Strong production experience with Kotlin and Jetpack Compose in real-world applications Solid experience integrating with platform APIs, third-party SDKs, and backend services (REST APIs, asynchronous data flows, coroutines/Flow) Solid engineering discipline: incremental delivery, pragmatic testing, careful refactoring, and effective risk management Nice to have Experience with Google Health Connect integrations — reading/writing health data, permissions, and background sync Experience with health tech, wellness, or regulated products (e.g., HIPAA, health data handling) Experience contributing to or extending internal frameworks/libraries Experience with analytics/experimentation (A/B testing), instrumentation, and monitoring We offer We gather like-minded people: Top tech minds driving innovation in AI, cloud and digital platform modernization Supportive team and agile, startup-like culture Hybrid by design mode and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Career development programs Thought leadership, mentoring, soft skills and well-being programs Certification (Anthropic, Gemini, GCP, Azure, AWS) English classes We cover it all: Stable pay Participation in the Employee Stock Purchase Plan with a 15% discount Benefits package (health insurance, multisport, shopping vouchers) Referral bonuses up to $2,000 Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and more Corporate, social and well-being events Please, note: Benefits listed above are available to employees only We are open for working with Contractors. Terms of B2B cooperation agreements are agreed individually We will reach out to selected candidates exclusively EPAM is global leader in AI transformation engineering and integrated consulting, serving Forbes Global 2000 companies and ambitious startups. With over thirty years of expertise in custom software, product and platform engineering, we empower our clients to become AI-Native enterprises, driving measurable value from innovation and digital investments.

Technology

EPAM Systems

Senior Android Engineer

Senior

Remote

Poznan, WP, Poland

🏢 Summary: Senior Android Engineer role focused on building and maintaining reliable mobile integrations that ingest, unify, and expose health data from device and third-party sources. The position works across Android and backend boundaries to deliver secure, stable end-to-end health-data flows with product, QA, and partner teams. 🗂️ Requirements: 5+ years building, shipping, and maintaining mobile applications, Senior-level Android development experience, Android architecture, performance, debugging, and stability expertise, Production Kotlin experience, Production Jetpack Compose experience, Platform API, third-party SDK, and backend service integration experience, REST API and asynchronous data-flow experience, Coroutines and Flow experience, Incremental delivery, pragmatic testing, refactoring, and risk-management discipline 📃 Skills: Android, Kotlin, Compose, REST, Coroutines, Flow, APIs, SDKs 🏢 Description: We are looking for a Senior Android Engineer to build and harden the mobile client integrations that bring health data into the client’s application — including on-device and third-party health data sources — and to expose that data cleanly to the product teams that consume it. We are looking for a proactive and self-sufficient person, able to navigate complex integration work across mobile and backend boundaries, unblock themselves quickly, and collaborate closely with backend, QA, and partner teams. Responsibilities Build and maintain Android client integrations for ingesting and unifying health data from on-device and third-party sources Integrate with Google Health Connect and external health data providers, handling permissions, sync, and data quality Expose health data cleanly to product teams through shared, well-documented client interfaces Partner with backend, QA, and consuming product teams to deliver reliable end-to-end data flows Ensure quality and safety through incremental rollouts, with a strong focus on stability and performance Requirements Senior Android engineer with 5+ years building, shipping, and maintaining mobile apps Deep expertise in Android development, including architecture, performance, debugging, and stability Strong production experience with Kotlin and Jetpack Compose in real-world applications Solid experience integrating with platform APIs, third-party SDKs, and backend services (REST APIs, asynchronous data flows, coroutines/Flow) Solid engineering discipline: incremental delivery, pragmatic testing, careful refactoring, and effective risk management Nice to have Experience with Google Health Connect integrations — reading/writing health data, permissions, and background sync Experience with health tech, wellness, or regulated products (e.g., HIPAA, health data handling) Experience contributing to or extending internal frameworks/libraries Experience with analytics/experimentation (A/B testing), instrumentation, and monitoring We offer We gather like-minded people: Top tech minds driving innovation in AI, cloud and digital platform modernization Supportive team and agile, startup-like culture Hybrid by design mode and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Career development programs Thought leadership, mentoring, soft skills and well-being programs Certification (Anthropic, Gemini, GCP, Azure, AWS) English classes We cover it all: Stable pay Participation in the Employee Stock Purchase Plan with a 15% discount Benefits package (health insurance, multisport, shopping vouchers) Referral bonuses up to $2,000 Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and more Corporate, social and well-being events Please, note: Benefits listed above are available to employees only We are open for working with Contractors. Terms of B2B cooperation agreements are agreed individually We will reach out to selected candidates exclusively EPAM is global leader in AI transformation engineering and integrated consulting, serving Forbes Global 2000 companies and ambitious startups. With over thirty years of expertise in custom software, product and platform engineering, we empower our clients to become AI-Native enterprises, driving measurable value from innovation and digital investments.