Job description Hello World! We are The Codest - International Tech Software Company with tech hubs in Poland delivering global IT solutions and projects. Our core values lie in “Customers and People First” approach that prioritises the needs of our customers and a collaborative environment for our employees, enabling us to deliver exceptional products and services. Our expertise centers on web development, cloud engineering, DevOps and quality. After many years of developing our own product - Yieldbird, which was honored as a laureate of the prestigious Top25 Deloitte awards, we arrived at our mission: to help tech companies build impactful product and scale their IT teams through boosting IT delivery performance. Through our extensive experience with product development challenges, we have become experts in building digital products and scaling IT teams. But our journey does not end here - we want to continue our growth. If you’re goal-driven and looking for new opportunities, join our team! What awaits you is an enriching and collaborative environment that fosters your growth at every step. Project description: Our client is one of the largest e-commerce platforms in Europe, used by millions of users every day. The company connects sellers - from small businesses to global brands - with customers, offering a vast product selection, fast delivery, and a well-crafted shopping experience. Project Name: Delivery Optimization Engine (DOE) We are looking for support of Senior Software Engineer specializing in Python and routing algorithms. The specialist will be responsible for supporting the design and scaling of high-throughput services that power our first and last-mile operations. By leveraging network analysis and spatial optimization, the specialist will assist in building the next generation of company’s Delivery Optimization Engine (DOE) and directly enhancing our logistics efficiency. Modern Tech Stack: We are bypassing traditional, legacy GIS software in favor of cloud-native Python architectures, Big Data solutions, and modern routing APIs (e.g., Google, HERE, open-source routing engines). The role: Backend & Routing: Python, Microservices, Open-source & Commercial Routing Engines. Data & Cloud: Google Cloud Platform (BigQuery, Dataflow Composer/Airflow), SQL. Infrastructure: Kubernetes, Terraform, CI/CD pipelines. Job requirements - At least 4 years of commercial experience in backend software development using Python and SQL. - Possess experience or a strong understanding of the logistics domain, network analysis, and routing (e.g., graph theory, road network modeling, Vehicle Routing Problems). - Experience with geospatial data concepts applied via code (e.g., H3/spatial indexing, clustering algorithms, PostGIS). - Be familiar with cloud ecosystems (Google Cloud Platform preferred) and modern infrastructure tools (Kubernetes, Terraform, Airflow). - Advocate for engineering excellence, including clean code, TDD, CI/CD, and a strong commitment to rigorous code reviews to maintain team architectural stability. - Know how to design and scale a microservices-based architecture. - A positive attitude, excellent teamwork skills, and a higher technical education (Computer Science or related fields). - English level min. B2+ - Required to work from the Warsaw office once a month. Our offer: - 20–25k PLN on a B2B contract - Access to the Worksmile platform - A work environment that values growth and innovation — you bring the ideas, and we want to hear them 😉 Recruitment process: - 30-minute screen with our recruiter, Justyna - 1h technical interview - 1h interview with the client Offer Questions, insights? Feel free to reach out to our recruiting team: justyna.pazdalska@thecodest.co In the meantime, feel free to visit our website where you can find key facts about us. Remote PLN 20,000 - PLN 25,000 per month Development All done! Your application has been successfully submitted! Other jobs You've already applied for this job We appreciate your interest in this position. Unfortunately, you have already applied for this job.