Backend Developer (m/w/d) PHP PostgreSQL

Pakajo GmbH is revolutionizing international logistics, making cross-border parcel shipping simple and efficient for leading e-commerce retailers and media houses. Through our innovative "Glocal" model, we connect national postal services across 23 countries via 441 corridors, operate proprietary linehauls, and power electronic customs data processing with our advanced Customs Engine. This unique approach allows us to offer international shipping at nearly domestic rates, delivering an average of 57% cost savings compared to traditional cross-border methods.

Having achieved profitable growth from a bootstrapped start, we are now investor-funded and scaling rapidly. To support this exciting phase, we are building our in-house Backend Team and seeking a talented Backend Developer to join us. This is a unique opportunity to contribute significantly to our core platform, shaping critical features that digitalize complex shipping and fulfillment processes.

• Location: Hamburg
• Type: Full-time
• Compensation: Commensurate with experience

Responsibilities

• Develop and enhance features for our core platform, including the shipping and fulfillment portal, carrier integrations, data import/export functionalities, and our proprietary APIs (CrossBorderX, Return Module).
• Integrate new postal companies, carriers, and customer systems using diverse interfaces such as REST, EDI, and structured data feeds, treating each integration as a distinct project with visible results.
• Collaborate on the Customs Engine, implementing and adapting to new regulatory requirements (e.g., EU customs rules) alongside the development team.
• Ensure code quality through writing automated tests, actively participating in code reviews, and continuously growing professionally under the close guidance of our Lead Developer.

Qualifications

• Completed degree in Computer Science, Media Informatics, or a related discipline, or equivalent professional training.
• 2-4 years of professional experience in Backend Development with PHP; initial experience with a modern framework (Laravel or Symfony) is a plus, or a strong motivation to quickly learn and apply one.
• Basic knowledge of C/C++, ideally coupled with experience using libraries such as ImageMagick and native network APIs (e.g., Berkeley Sockets).
• Good SQL knowledge, preferably with PostgreSQL or MySQL.
• Prior experience with REST APIs, both as a provider and a consumer.
• A strong understanding of responsive web design principles and UX optimization.
• Proficiency in version control systems (e.g., Git) and familiarity with agile development methodologies.
• Enthusiasm for innovative technologies and a keen interest in AI applications.
• Demonstrated creativity, strong initiative, and the ability to independently overcome technical challenges, coupled with a meticulous and reliable working style.
• Excellent team spirit and communication skills; a strong willingness to learn, especially in gaining specialized knowledge of customs and logistics.
• Good proficiency in both German and English.