Senior Software Engineer

Complexio Limited; Warszawa; On-site; PLN 120,000 - 160,000; Full time

Benefits offered by this job

Professional growth opportunities

Collaborative team environment

Dynamic field of AI

Job summary

A cutting-edge AI technology firm in Warsaw is seeking a seasoned software developer with over 5 years of experience. You will be responsible for developing sophisticated AI-driven business solutions using Python and JavaScript, along with cloud platforms and containerization technologies. Strong understanding of relational and KV databases is essential. Join a collaborative team driving industry transformation through AI.

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 platform (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.

Skills

Software development

Python

Vanilla JavaScript

Relational databases (PostgreSQL)

KV stores (Redis)

Cloud platform (Azure / AWS / GCP)

CI/CD pipelines

GitHub Actions

Event-driven systems

Containerization tools (Docker, Podman)

Orchestration platform (Kubernetes)

English min B2

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.