Job DescriptionAs part of SumUp, you will develop state of the art payment terminals and terminal peripherals by working closely with our hardware/software/mechanical team, marketing, and manufacturing partners, to envision, beautifully design, and certify for payment and security specifications. In addition, you will contribute to the unique SumUp culture which comprises a group of people that share the same vision. Tasks: Design specification and implementation of embedded software in the field of payment processing terminals. Technical analysis, verification and validation of the software. Execution of code and architecture reviews to ensure the quality of implemented solutions. You bring your experience to develop software on embedded operating systems and bare-metal systems. Perform acceptance, functional, regression and exploratory testing on the SumUp platform. Take care of manual, automation tests and investigate production issues. Read remote system logs. Create test plans, test documentation and manuals. Commit proactive approach within the team. Communicate and collaborate with colleagues within and outside of the Software Department to deliver best value. Requirements: - Solid knowledge of the C programming language - Operating System knowledge, preferably Linux - Good understanding of embedded systems - Knowledge on peripherals and buses like SPI, I2C etc. - Solid understanding of Git cvs - Knowledge on NFC, BT, WIFI - Knowledge on middleware and application interfaces Good to have skills: - Knowledge on some scripting: Python, Perl, Shell script, etc. - Knowledge on TrustZone - Knowledge on TI Sitara processors. - Prior experience with mainlining patches for linux / uboot Reasons to join SumUp: Budget for attending conferences and advancing your career. We encourage you to speak at conferences and give talks! Weekly Lunch and Learn session, where the local engineering team exchanges ideas over company-sponsored lunch. Semi-annual off-sites, where the tech teams from Berlin, Sofia, and São Paulo gather together. In the past we've gone to Bulgaria and Greece and a castle in the German countryside. We have a close, welcoming and international community. Our team comes from 24 different countries creating a fun, international environment. We get together regularly for brunches, cocktail nights, football, office parties, German classes, and yoga. All the startup swag you expect: kicker table, unlimited coffee, and a shiny MacBook Pro. Apply now! We are looking forward to meet our new team-member!