Pouya
Heydari

Senior Android Engineer at SumUp

Currently at SumUp — Berlin, Germany

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Get to know me

About Me

Hi, I'm Pouya

A senior Android engineer with 13+ years of experience building high-performance mobile applications at scale. Currently at SumUp, previously at FREE NOW and Tapsi. Certified by JetBrains and Android ATC, with 10+ published apps on Google Play and 6+ open-source libraries on GitHub. Passionate about clean architecture, mentoring engineers, and driving technical excellence in mobile teams.

Name

Pouya Heydari

Location

Berlin, Germany

Email

pouyaheydary@gmail.com

Languages

English, Persian

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What I bring to the table

Skills & Expertise

Mobile Engineering

Android (Kotlin / Java)

Jetpack Compose

Kotlin Multiplatform (KMP)

Mobile CI/CD Pipelines

App Release Management

Feature Flags & Experimentation

Crash-free Rate & Monitoring

Performance Optimization

Architecture & Technical

Clean Architecture / MVVM / MVI

Modularization & Scalable Codebases

API Design & Backend Collaboration

Design Systems & Component Libraries

Dependency Injection (Hilt / Dagger)

Automated Testing Strategy

Code Review & Quality Standards

DevOps & Tooling

CI/CD (GitHub Actions / Bitrise / Jenkins)

Firebase / Crashlytics / Analytics

Git / Git Flow / Trunk-Based Dev

Jira / Confluence / Notion

Datadog / Grafana / Monitoring

Play Console / App Store Connect

Strategy & Process

Agile / Scrum / Kanban

OKRs & Goal Setting

Technical Strategy & Vision

Architecture Decision Records

Risk Assessment & Mitigation

Vendor & Platform Evaluation

Process Optimization

Leadership & Management

Engineering Management

Team Building & Hiring

Performance Reviews & Career Growth

1:1s & Mentorship

Cross-functional Collaboration

Stakeholder Management

Roadmap & Capacity Planning

Incident Management

0+

Projects Completed

0

Certifications

0+

Happy Clients

0+

Years Experience

Why teams want me

What I Bring

Scalable Architecture

Designing modular, multi-module Android codebases with clean architecture that scale with the team and product.

Performance at Scale

Optimizing apps serving millions of users — from startup time and memory usage to network efficiency and crash-free rates.

Team Elevation

Mentoring engineers through code reviews, pair programming, and knowledge sharing to raise the bar across the team.

Modern Android

Driving adoption of Jetpack Compose, Kotlin Coroutines, and the latest Android best practices in production codebases.

Reliable Delivery

Building robust CI/CD pipelines, feature flag systems, and release processes that ship with confidence.

Cross-team Impact

Bridging product, design, and backend teams to align on technical decisions and deliver cohesive user experiences.

Where I've been

Experience

Jul 2024 — Present

Senior Android Engineer

SumUp

Delivering high-impact Android features for SumUp's merchant payment products across 36 markets. Shipped Cancel Transaction for CR Checkout, reducing support cases by 6%. Led Offline SDK improvements (batch upload, encrypted storage), boosting offline transaction success by 5%. Redesigned Secure Pairing for Solo Lite, increasing pairing success from 79% to 91%. Fixed a crash affecting 7,000+ users, eliminating 16,000+ crashes in 90 days. Improved reader connection speed by 2 seconds across all devices.

Apr 2022 — Jun 2024

Android Software Engineer

FREE NOW

Worked on Payment & Core for Europe's mobility super-app, available in 150+ cities. Designed and implemented modular, reusable payment APIs across 15+ modules for cross-team integration. Initiated and led 3 major features, driving a 20% boost in user engagement. Resolved 200+ bug tickets, improving crash-free user experience by 10%. Integrated 3 new payment providers, enhancing payment gateway uptime and profitability.

Oct 2021 — Jan 2022

Android Team Lead

Tapsi

Managed a team of 8 Android engineers at Iran's largest ride-hailing platform. Contributed actively in weekly meetings to improve team knowledge. Proposed new technologies and approaches to improve code quality. Pair-coded with new joiners to accelerate onboarding. Owned and successfully delivered 3 major features.

Jan 2021 — Oct 2021

Senior Android Developer

Soshyant

Architected, developed, and distributed a full e-trading and cryptocurrency platform in 6 months, meeting all project deadlines. Achieved 80% code coverage by writing unit tests for 100% of ViewModels and Repositories. Automated all deployment phases by configuring Gradle and GitLab CI, eliminating manual deployment. Actively involved in UI/UX design, providing feedback that resulted in a more user-friendly app.

Jan 2019 — Apr 2022

Android Instructor & Mentor

Sematec

Designed three Android development courses and their curricula for one of Iran's most popular IT institutes. Improved student progress by creating supplementary video courses. Helped more than 50 students land jobs at tech companies. Continued delivering the same quality of instruction via online platforms during the COVID-19 situation.

Oct 2018 — Jan 2021

Android Team Lead

KIT (Keyvan IT)

Made the application 100% crash-free, resulting in a 50% increase in positive reviews. Shortened the test phase by writing unit tests for ViewModels and Repositories, reducing test time from 2 days to 1 hour. Introduced ktlint and SonarLint to produce standard Kotlin code. Hired 5 Android developers and enabled the company to run 2 additional projects, increasing team capacity by 50%.

Oct 2018 — Oct 2019

Android Instructor

MFT (Tehran Institute of Technology)

Taught Android development at Iran's largest IT institute with 60+ branches nationwide. Delivered two courses: Introduction to Programming (diagrams, conditions, loops) and Android Pack (Java fundamentals + Android development).

Aug 2017 — Jan 2019

Android Developer

Fatech Co. (dbee)

Enabled the startup to enter the market faster by releasing the first version of the apartment rental platform in 4 months. Influenced the app's design by working closely with designers for a more intuitive experience. Architected the application with MVP, improving performance and scalability. Actively collaborated with backend developers on API design.

Feb 2018 — Mar 2018

Android Developer

Eligasht

Improved maintainability at one of Iran's most famous travel agencies by refactoring legacy code and introducing MVVM architecture. Facilitated team collaboration by adding Kotlin DSLs to core modules. Accelerated user acquisition by reducing APK size by 50%.

Apr 2017 — Feb 2018

Android Developer

Yaico

Built package delivery features for a logistics company operating since 2000. Adopted Jira, Trello, and Agile practices, improving team productivity. Enhanced the codebase using MVC architecture and Android Annotations. Applied SOLID principles to reduce complexity and improve maintainability. Participated in UI/UX meetings to advise designers from a technical perspective.

Jan 2013 — May 2016

Project Manager

Yara Mobile

Helped develop and ship over 5 mobile applications at a company behind several well-known apps in Iran. Actively engaged in agile software development processes. Gained deep understanding of the end-to-end software delivery lifecycle.

Selected work

Portfolio

Ride-Hailing

Tapsi Driver

Ride-Hailing

Tapsi Driver

Ride-Hailing

Tapsi Passenger

Ride-Hailing

Tapsi Passenger

Application

Mango

Application

Mango

Utility

CallLocator

Utility

CallLocator

Transportation

Kaleskeh Driver

Transportation

Kaleskeh Driver

Transportation

Kaleskeh Passenger

Transportation

Kaleskeh Passenger

Logistics

KBK Driver

Logistics

KBK Driver

Logistics

KBK Passenger

Logistics

KBK Passenger

Travel

dbee

Travel

dbee

Travel

Eligasht

Travel

Eligasht

Application

Shahrdaad

Application

Shahrdaad

Open Source

StarWars

Open Source

StarWars

Open Source

MusicManager

Open Source

MusicManager

What people say

Testimonials

"Pouya Heydari is a creative Android programmer who deals with challenges strongly every day. It's a pleasure to work together."

Mehrdad Goodarzi

iOS Developer at Mazdax

"As a student, I have learnt a lot from Pouya. He is a passionate teacher and a highly skilled Android Developer."

Roxana Teymouri

Android Developer at hmmh GmbH

"Pouya is a hardworking and committed person. He is so passionate and creative. I was satisfied working with him."

Farhad Davarpanah

Founder at Parsaran

"Pouya has a great ability to connect with his customers and help them know what exactly they need. This is the key to his success."

Omid Soleiman

Freelance .NET Developer

"Pouya is one of the best developers I have worked with during my professional lifetime as an Android developer."

Amirhossein Teymouri

Android Developer at Mobility One

"I have learnt so many things from Pouya. He is really ambitious about promoting himself and his professional knowledge — always trying and never gives up."