Top Software Engineer Jobs in Krakow

Design and implement backend trading services, own features end-to-end (schema, API, tests, UI integration), contribute to real-time infrastructure and client-facing APIs, and write integration tests against real dependencies.

Join a global tech company as a Senior Full-Stack Software Engineer, focusing on core product evolution, architectural decisions, and delivering high-quality software solutions using Python and React.

Full-stack Developers at QuantCo build user interfaces for machine learning solutions, collaborating with data scientists and engineers to deliver actionable products.

Design and lead Java/Spring and Kafka Streams services processing high-volume BLE and IoT telemetry. Own third-party device integrations, real-time data ingress and egress, external APIs, architecture, documentation, testing, observability, and production reliability. Collaborate with product, data platform, and SRE teams; resolve dependencies, establish engineering standards, use AI development tools, and mentor engineers across a distributed, multi-tenant SaaS platform.

Own the end-to-end architecture and implementation of a scalable data platform processing real-time IoT telemetry and predictive analytics. Build Kafka-based streaming and batch pipelines, Kubernetes workloads, AWS infrastructure, relational data models, integrations, and CI/CD systems. Lead performance, reliability, observability, privacy, and compliance efforts in regulated healthcare environments, while applying AI-assisted engineering practices and participating in 24/7 on-call support.

Build and ship growth-focused changes across mobile, web, and backend. Design experiments to improve onboarding, activation, monetization, and retention. Own implementation, testing, release, instrumentation, and production monitoring; improve experimentation systems and subscription/payment journeys.

Design, develop, and maintain scalable, secure backend systems for fintech products. Build REST APIs and microservices supporting card payments, treasury management, transaction booking, and crypto liquidity. Work on greenfield and existing systems using Java, Spring Boot, PostgreSQL, TDD, DDD, and CI/CD, while collaborating with a high-performing team to deliver maintainable products.

Design, develop, and maintain scalable, secure backend systems for fintech products. Build REST APIs and microservices supporting card payments, treasury management, transaction booking, and crypto liquidity. Contribute to greenfield development and existing-system improvements using Java, Spring Boot, PostgreSQL, TDD, DDD, clean code, and CI/CD. Collaborate with a world-class team to deliver maintainable, high-performing products.

Develop reliable, scalable Aras Innovator solutions in a cross-functional team. Responsibilities include refining user stories, planning iterations, researching and prototyping, collaborating on technical architecture, coding high-quality components, writing automated tests, conducting code reviews, optimizing performance, and improving team processes. The role also involves knowledge sharing and applying AI-assisted development and LLM fundamentals.

Build and maintain integrations for North's agentic platform, own the end-to-end integration pipeline, create evals and tests to ensure reliability, tune tool descriptions, and help other engineers add and maintain integrations while using AI responsibly to improve performance and quality.

Design and develop scalable distributed backend services using C# and .NET, secure REST APIs, data models, cloud-native infrastructure, and enterprise integrations. Optimize database performance, write automated tests, participate in architecture and code reviews, troubleshoot production issues, and mentor junior engineers. The role emphasizes reliability, scalability, maintainability, and may involve AWS, Azure, GCP, Docker, Kubernetes, infrastructure as code, CI/CD, and multimedia or voice systems.

As a Senior Software Engineer, you will build scalable systems and data pipelines for consumer credit reporting, drive strategic outcomes, shape architecture, and mentor team members while ensuring operational excellence.

Lead backend engineer for EU cards: set technical strategy, design low-latency transaction and post-transaction ledgering/reconciliation systems, ensure operational availability (monitoring, on-call, playbooks), collaborate cross-functionally, define code/design standards, and mentor and grow engineering talent.

Lead a backend engineering team to deliver quarterly goals, design and build low-latency transaction and post-transaction systems, collaborate with product and design, ensure operational availability and on-call readiness, improve code and design standards, and mentor engineers.

The Software Engineer will design, develop, and support the MEMX Trading system software, focusing on production support during US evening hours.

Design, build, and optimize GPU-accelerated deep learning inference software and frameworks (e.g., SGLang, vLLM). Profile and tune LLM and Generative AI model serving across NVIDIA accelerators, contribute code to inference libraries, and collaborate across teams to deploy high-performance multi-GPU solutions.

Lead design and implementation of scalable microservices for an e-commerce platform, provide technical leadership across domains, mentor teams, participate in architecture and code reviews, and collaborate with stakeholders to align technical solutions with business needs.

Design, develop, and maintain scalable backend services and APIs for an access control IoT platform. Build device communication layers, contribute full-stack features (including Ember.js), lead technical projects, mentor engineers, own development lifecycle, test and monitor production, and work hands-on with access control hardware.

Build and ship frontend features for checkout and merchant dashboard using React and TypeScript, deploy to production, collaborate with Design, contribute to Python backend when useful, and participate in architecture and quality-focused engineering practices.

Develop and maintain Layer1 control software for physical network connectivity, instrument telemetry, and interface with hardware teams. Design, implement, test, and debug features in C/C++ and Python; collaborate with customers, hardware, and support teams; own projects from definition to deployment.

Build and ship full‑stack features for North, an enterprise AI workspace. Develop secure autonomous agents, execution engines, integrations, observability and evaluation systems. Collaborate with researchers to productionize models and deliver performant, low‑resource deployment code while adhering to strict security and privacy constraints.

The Software Engineer will develop backend systems using Rust, manage multimodal data, and improve data infrastructure with a focus on performance and design ownership.

The role involves optimizing hardware support within a software stack for AI model deployment, collaborating with teams and hardware vendors to enhance performance and portability across platforms.

Canonical seeks open-source enthusiasts to optimize Ubuntu for new silicon technologies, collaborating with teams and customers to enhance software quality and performance across various platforms.

Design and develop services for automating work with a large server fleet while engaging in DevOps processes.