Senior Full Stack Engineer – PHPGo + Flutter (mfx)

Your mission

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.

Our tech stack: Flutter (mobile & web) Go PHP and AWS - including 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

• A recipe for success: With over a decade of experience in the gastronomy and delivery industry SIDES is known as a true specialist in this field. Join a leading player and help shape the future of the market.
• Ownership & impact: We give you the space to bring in your ideas grow your strengths and take real responsibility. Youll work independently while being supported by a strong and collaborative team.
• High-quality work setup: Modern hardware ergonomic workstations and a professional office environment ensure you can do your best work.
• Hungry for growth: Continuous learning matters to us. Through regular feedback cycles we actively support your personal and professional development.
• A positive workplace culture: Enjoy a welcoming atmosphere a trusting team culture and our well-connected office in the heart of Berlin (Südkreuz).

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 and connect with the team

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 to Babbel for flexible language learning.
• INCENT & Corporate Benefits: Attractive employee discounts and exclusive partner offers.
• Hybrid work: A mix of office and home office depending on your role and team.
• Flexible working hours: Working hours that fit your daily life and offer real flexibility.
• December 24th & 31st off: Fully off without deducting vacation events: Our annual highlights - the SIDES Summer Party and our Christmas Get-together.