[Hiring] Backend Engineer @kellton Europe

Role Description

We’re building and scaling solutions for a global non-profit organization focused on large-scale humanitarian impact. By joining this project, your work will directly support meaningful initiatives around the world.

We're looking for you if:

• You have 3+ years of commercial experience with Python & Django.
• You’re great at collaborating with clients, advising them on solutions, and building long-lasting relationships.
• You have hands-on experience with asynchronous task processing using Celery and Redis.
• You’re proficient with PostgreSQL database design, optimization, and RESTful APIs.
• You know how to work with Docker and Elasticsearch for efficient search and containerization.
• You have an understanding of modern front-end technologies: React and TypeScript.
• You speak and understand English at a B2+ level.
• You can work on a B2B contract / freelance basis.

Nice to have:

• Familiarity with CI/CD pipelines, automated testing, and web app security best practices.
• Experience with cloud platforms (e.g., AWS, Azure, GCP).

Your daily tasks:

• Developing high-quality backend systems and APIs (Python/Django) for our non-profit partner.
• Building intuitive, dynamic web interfaces using React and TypeScript.
• Designing and optimizing database structures (PostgreSQL) and search functions (Elasticsearch).
• Managing background jobs, queues, and caching strategies using Celery and Redis.
• Defining features, technical specifications, and architecture based on business requirements.
• Participating in client meetings, advising on technical choices, and maintaining strong relationships.
• Enhancing code quality through code reviews, automated testing, and fixing bugs.

Qualifications

• 3+ years of commercial experience with Python & Django.
• Experience with asynchronous task processing using Celery and Redis.
• Proficient with PostgreSQL database design, optimization, and RESTful APIs.
• Knowledge of Docker and Elasticsearch.
• Understanding of modern front-end technologies: React and TypeScript.
• English proficiency at a B2+ level.
• Ability to work on a B2B contract / freelance basis.

Requirements

• Familiarity with CI/CD pipelines, automated testing, and web app security best practices.
• Experience with cloud platforms (e.g., AWS, Azure, GCP).

Benefits

• This is a B2B freelance position.
• We operate on an hourly basis, and you will invoice us monthly for the hours you work.

Company Description

A global team with high standards - we maintain Silicon Valley quality and vibe, even though we have spread far beyond.

• We've made a real difference in the world since 2008!
• We deliver for Zoetis, Apple, Tesla, NATO, UNICEF, and many more.
• 100-people-sized A-Team in Wrocław, with other offices in Poland, UK, and Ireland.

Clear recruitment process:

• Introductory meeting - we are a close-knit team, and getting to know each other is our priority!
• Technical screening with Senior Backend Engineer - after that stage, you won’t have any unanswered technical questions!
• A meeting with the Client - to get to know each other better and ensure we're aligned on values and expectations.