Senior Software Engineer

Complexio; Województwo mazowieckie; On-site; PLN 100,000 - 140,000; Full time

Job summary

A leading AI solutions provider in Poland seeks a Software Developer with over 5 years of experience. The role emphasizes strong skills in Python, JavaScript, cloud platforms, and event-driven systems. The successful candidate will collaborate with an innovative team to redefine enterprise productivity through AI. Skills in CI/CD pipelines, containerization (Docker, Kubernetes), and strong English communication (min B2) are essential. The position offers opportunities for growth in a dynamic and fast-paced environment.

Qualifications

• 5+ years of experience in software development.
• Strong experience with Python.
• Experience with vanilla JavaScript.
• Experience with relational databases (PostgreSQL) and KV stores (Redis).
• Experience in cloud platforms (Azure / AWS / GCP).
• Experience with CI/CD pipelines and tools like GitHub Actions.
• Strong understanding of event-driven systems and distributed architectures.
• Experience with containerization tools (Docker / Podman) and orchestration platform (Kubernetes).
• English min B2.

Responsibilities

• Join a pioneering joint venture at the intersection of AI and industry transformation.
• Work with a diverse and collaborative team of experts from various disciplines.
• Opportunity for professional growth and continuous learning in a dynamic field.

Skills

Python

JavaScript

Relational databases

KV stores

Cloud platforms

CI/CD

Event-driven systems

Containerization

English (min B2)

Tools

Docker

Kubernetes

Job description

Complexio’s Foundational AI platform automates business processes by ingesting and understanding complete enterprise data—both structured and unstructured. Through proprietary models, knowledge graphs, and orchestration layers, Complexio maps human-computer interactions and autonomously executes complex workflows at scale.

Established as a joint venture between Hafnia and Símbolo—with partners including Marfin Management, C Transport Maritime, BW Epic Kosan, and Trans Sea Transport—Complexio is redefining enterprise productivity through context-aware, privacy-first automation.

The project focuses on enhancing business processes through the use of artificial intelligence and advanced technologies. It enables intelligent data handling and supports automated decision-making. Built with modern, high-performance solutions, it ensures efficiency, security, and scalability.

Qualifications

• 5+ yearsof experience insoftware development.
• Strong experience withPython.
• Experience withvanilla JavaScript.
• Experience withrelational databases(PostgreSQL) andKV stores(Redis).
• Experience incloud platform(Azure / AWS / GCP).
• Experience withCI/CD pipelinesand tools likeGitHub Actions.
• Strong understanding ofevent-driven systemsand distributed architectures.
• Experience with containerizationtools (Docker/ Podman) and orchestration platform (Kubernetes).
• English min B2.

Nice to have

• Experience withgraph databases(Neo4j) andvector databases(Milvus).
• Experience withNLP libraries and frameworks(spaCy / Transformers).
• Proficiency in compiled languages (Rust, Go, Java, C#).
• Experiencewithmachine learning conceptsand the ability to work with NLP datasets.
• Experience in buildingweb applicationsusing modern frameworks (React, Vue.js) ordesktop applications(Electron, Tauri).

• Join a pioneering joint venture at the intersection of AI and industry transformation.
• Work with a diverse and collaborative team of experts from various disciplines.
• Opportunity for professional growth and continuous learning in a dynamic field.