Senior Full Stack Engineer – PHP/Go + Flutter

About SIDES

SIDES builds a cloud-based POS and payment operating system for the hospitality industry. We connect POS, payments, delivery platforms, kitchen tools, self-order solutions, apps, and webshops into one powerful, fully integrated platform—highly performant, scalable, and reliable, even under heavy load. Thousands of hospitality businesses rely on our technology every day to run their operations efficiently and digitally.

Tech Stack: Flutter (mobile & web), Go, PHP, AWS, and real POS hardware seamlessly integrated into our system.

Your Responsibilities

• Deliver features end-to-end in a cross-functional team, from ideation and design to implementation, rollout, and operations
• Work across the entire stack, from backend to frontend
• Use AI tools (e.g., OpenCode, Copilot) responsibly and help establish best practices within the team
• Ensure operational quality with a strong focus on performance, security, stability, scalability, and observability
• Actively contribute to architectural and design decisions
• Support and grow the team through mentoring and pair programming
• Help define and improve standards for testing, code quality, and CI/CD
• Build clean APIs, well-designed data models, and high-performance user experiences

Your Profile

• Several years of experience as a Senior Full Stack Engineer
• Strong experience in backend development with PHP and/or Go, combined with hands-on experience in Flutter
• Ability and willingness to work across both backend (PHP/Go) and frontend (Flutter) as part of a unified stack
• Pragmatic, solution-oriented mindset with a strong focus on quality
• Solid understanding of MySQL, relational data models, and API design
• Experience with AWS and containerized deployments; Kubernetes is a plus
• Systems thinking across architectural and technological boundaries
• Independent, structured working style with strong analytical skills
• Fluency in English (required); German is a plus

Perks & Benefits

• Recipe for success: Join a leading player in gastronomy and delivery tech and help shape the future of the market.
• Ownership & impact: Bring your ideas, grow your strengths, and take real responsibility with support from a strong, collaborative team.
• High-quality work setup: Modern hardware, ergonomic workstations, and a professional office environment.
• Continuous learning: Regular feedback cycles support personal and professional development.
• Positive workplace culture: Enjoy a welcoming atmosphere, trusting team culture, and our Berlin (Südkreuz) office.

Workplace Environment Perks

• Central office location in Berlin
• Regular office and team events
• Snacks and drinks in the office
• SIDES Library
• Dog-friendly workplace
• Onboarding lunch to help you settle in

Your Benefits

• €50 monthly benefit allowance — your choice: JobRad, Deutschlandticket, Company pension scheme (bAV), Wellhub
• Urban Sports Club: Discounted membership with access to fitness, classes, and wellness activities
• Instahelp: Professional mental health support, available whenever you need it
• Babbel: Free access for flexible language learning
• INCENT & Corporate Benefits: Employee discounts and exclusive partner offers
• Hybrid work: Mix of office and home office depending on your role
• Flexible working hours to fit your daily life
• December 24th & 31st off: Fully off without deducting vacation days
• Company events: Annual SIDES Summer Party and Christmas Get-together