Senior Backend Developer (m/w/d)

New Soul; Berlin; Vor Ort; Vertraulich; Vollzeit

Zusammenfassung

A wellness company in Berlin is seeking a Senior Backend Developer to build and evolve backend systems that enhance customer experiences. You'll work on key functionalities such as bookings and payments. Ideal candidates have at least five years of PHP experience and are skilled in API integration and architectural design. The role offers remote work flexibility, ownership opportunities in projects, and competitive benefits including a centrally located office and modern equipment.

Leistungen

Flexible working hours

Top-spec laptop

Urban Sports Club membership

50% off all products and services

Qualifikationen

• 5+ years of professional experience with PHP.
• Strong architectural design skills.
• Proficient English speaking, German is a plus.

Aufgaben

• Build and maintain backend services for core platform.
• Design and implement APIs ensuring performance.
• Collaborate closely with frontend engineers and product teams.

Kenntnisse

PHP

API integration

Architectural design

Communication skills

English fluency

Tools

MySQL

Redis

Kubernetes

Git

Jobbeschreibung

Help us revolutionize the massage industry in Germany.

At New Soul, we’re redefining modern wellness by blending premium in‑studio experiences with a strong digital platform that powers booking, payments, memberships, and daily studio operations. As we scale across Germany, system stability, performance, and clean integrations are business‑critical — what we ship directly affects revenue, operational load, and customer experience.
We run a lean team with high ownership, minimal meetings, and a pragmatic engineering culture: ship impact, keep things maintainable, avoid over‑engineering, and document just enough so others can move fast with confidence.

Your Role

As a Senior Backend Developer, you’ll build and evolve our backend systems and integrations that support both customer‑facing journeys (booking, payments, memberships) and internal operational tooling. You’ll work closely with Product, Frontend, and Ops stakeholders to deliver scalable features, improve reliability, and reduce operational friction.
This is a great fit for someone who can operate independently, handle ambiguity, and drive work end‑to‑end — from understanding the problem to shipping the solution and leaving the system cleaner than before.

Your Responsibilities

• Build and maintain backend services that power core platform capabilities (e.g., booking availability, memberships, payments logic, operational workflows).
• Design, implement, and evolve internal and external APIs (GraphQL/REST), ensuring consistency, performance, and long‑term maintainability.
• Own technical execution for complex projects with unclear dependencies — align early, de‑risk quickly, deliver steadily.
• Proactively identify bottlenecks, failure points, and technical debt; propose pragmatic fixes and execute them.
• Create proof‑of‑concepts (POCs) where needed to validate approaches before implementation.
• Collaborate closely with frontend engineers, product, and operations teams to ensure smooth end‑to‑end delivery.

Your Tasks

• Initiate and maintain lightweight but useful technical documentation:
• API documentation (e.g., Swagger, ReadMe.io)
• Infrastructure and Component Diagrams (at a level less detailed than L4 but more comprehensive than nothing).
• Improve and operate within a custom / minimal‑framework environment — focusing on incremental improvements and clarity rather than relying on heavy frameworks as Symfony.
• Take ownership of delivery for multiple parallel initiatives, balancing urgency with quality.

Requirements

Must‑Have Skills

• 5+ years of professional experience with PHP, with continued interest in its application.
• A self‑organized, technically skilled individual who avoids over‑engineering solutions.
• Advanced stage of growth in understanding the balance of complexity vs. simplicity (e.g., past the "valley of despair" on the Dunning‑Kruger effect curve).
• Proficient in integrating and building internal and external APIs.
• Experienced in starting projects from scratch, with strong architectural design skills.
• Comfortable joining a project as an Individual Contributor (IC) rather than enhancing an existing system gradually.
• Capable of independently managing and delivering tasks, systems, and contributions that align with team goals.
• Strong communication skills, with a results‑oriented and efficiency‑driven mindset.
• Proficient English speaking, German is a plus

Nice‑to‑Have Skills

• Experience with other languages (especially Golang).
• Basic DevOps knowledge (Kubernetes, Terraform) and comfort working with infra‑adjacent topics.

Tech-Stack

• Core Frameworks and Libraries: In‑house Framework
• Languages and Tools: PHP8+, MySQL, Redis (Equivalents), RMQ/Kafka, Kubernetes
• Testing Frameworks: PHPUnit
• APIs and Integrations: GraphQL, REST APIs, OpenAPI
• Version Control and CI/CD: Git, Github Actions

What You’ll Get

• Real ownership and impact: Your work directly improves customer experience and studio operations and is used by thousands of customers across Germany.
• Pragmatic engineering culture: High trust, Flexible working hours, Minimal mandatory meetings.
• Engineers get a top‑spec laptop, using the platform of their choosing.
• The choice of a range of Company Benefits (50% of all products and services), Urban Sports Club membership and coverage of Deutschland‑Ticket.
• An office centrally located in Berlin’s beautiful Kollwitzkiez.

If you want to build reliable systems that power a real‑world product — and work with a team that values clarity, ownership, and smart simplicity — we’d love to hear from you.

Apply now!