Top Software Engineer Jobs in Krakow

Lead delivery of real-time fraud decisioning services and platform capabilities for international markets. Design and implement backend services and APIs, integrate regional vendors and ML/AI signals, support operations and on-call, and mentor engineers to maintain high-quality, scalable systems.

Build features, prototypes, and demos using modern AI coding tools and agents; iterate prototypes into reliable, scalable production; direct and evaluate AI coding agents; collaborate closely with founders and senior engineers; explore and improve AI development workflows to accelerate product delivery.

Own backend APIs, data pipelines, Elasticsearch infrastructure, AWS platform operations, CI/CD, observability, and data-quality tooling. Build scalable enrichment, search, ETL, metering, and billing systems while contributing to a React/TypeScript application. The role requires production ownership, incident response, infrastructure modernization, and strong AI-assisted and agentic development skills.

Design and build scalable software solutions using C# and .NET, owning the full software development lifecycle through production and continuous improvement. Contribute to architecture and technical direction, collaborate with Product and QA, write unit and integration tests, communicate technical decisions clearly, and mentor other engineers. The role requires strong engineering judgment, quality standards, and experience working in agile, cross-functional teams.

Lead design and development of Linux kernel functionality for BPF, networking, and security, integrating features into Cilium and Tetragon. Collaborate with engineering, product, customers, and the upstream Linux kernel community to shape technical direction, maintain code quality, and deliver scalable cloud-native solutions. The role may also involve presenting work at technical conferences and contributing to engineering best practices.

The role involves leading engineering teams in backend system design and delivery for financial platforms, ensuring quality and collaboration, and mentoring team members.

Design and scale mission-critical market data services for stocks, options, crypto, and foreign exchange. Responsibilities include architecting backend systems and APIs, maintaining software quality and test coverage, participating in code reviews, and troubleshooting incidents and bugs. The role uses Go and Python with REST, gRPC, WebSockets, SSE, Docker, Kubernetes, Google Cloud, BigTable, Prometheus, Grafana, and ELK.

Design and build durable, distributed data-streaming infrastructure that decouples process data from Camunda’s live execution engine. Develop customer-facing integrations such as Kafka connectivity, support analytics data consumption at scale, and make architecture decisions around consistency, durability, and storage. Participate in production support and on-call rotations while collaborating with Product, Data Layer, Distributed Systems, QA, SRE, and Support teams. Lead ambiguous, cross-functional engineering initiatives from design through delivery.

Build and maintain Camunda 8 backend data-layer services spanning relational databases and Elasticsearch/OpenSearch. Design scalable storage, query, retention, and streaming systems; improve performance, indexing, and production tooling. Lead engineering initiatives from solution design through delivery, collaborate across teams, provide L3 support, and participate in on-call rotations. Investigate production data issues and contribute to schema evolution, workflow automation, and CI improvements.

Design, implement, and test cloud-based server-side software in Python. Optimize code performance, maintain unit and integration tests, and work with AWS, Docker, DevOps, and CI/CD tools. Preferred experience includes reverse engineering public APIs, PostgreSQL, Django ORM and DRF, network protocols, and web or mobile technologies.

Design, build, and operate access experience services and developer-facing APIs/SDKs for Netflix's access control platform. Own system design, partner integration, rollout, and maintenance while ensuring secure, scalable, high-availability access tooling across global teams.

Design, develop, and maintain high-availability distributed systems supporting Akamai’s global network. Responsibilities include full product lifecycle ownership, improving testing, deployment, monitoring, and maintenance capabilities, mentoring engineers, and evaluating emerging network operations and automation technologies. The role requires software development on Linux/Unix platforms using Python, Go, and/or shell scripting, plus familiarity with internet protocols and version control systems.

Design, implement and maintain middleware for embedded automotive systems. Collect and analyze software requirements, produce design documentation, program modules, perform tests, integrate IPC and communication protocols, coordinate/lead SW activities, support clients and cross-team collaboration while following SW development standards.

Lead backend engineer on the Repayment Scheduling team responsible for owning and delivering quarterly goals, designing and operating backend systems that automate and orchestrate payments at scale. Collaborate with product, design, and analytics; define technical plans; improve availability and observability; support on-call and operational efforts; set code and design standards; and mentor and develop engineering talent.

Build and own end-to-end features across backend and frontend: design backend services and data models (Python/Django), implement RESTful APIs, create reusable frontend components (TypeScript/React), write tests, participate in code reviews, maintain production reliability and security, and collaborate with product and design.

Build and maintain high-throughput data pipelines, design schemas and data models, implement IaC and CI/CD, collaborate with Data Science/AI on feature stores and MLOps, monitor containerized systems, and advise stakeholders on data architecture.

Senior backend engineer for Affirm's Identity International team. Design, deliver, and operate identity/KYC and user lifecycle systems for international markets. Lead technical direction, translate goals into projects, improve code quality, availability, and scalability, mentor engineers, support on-call and operational health, and collaborate with product, design, and analytics to manage risks and tradeoffs.

Build and maintain hardened Ubuntu-based container images and the automated CI/CD pipelines to build, test, scan, sign, publish, and retire them. Integrate upstream open-source projects, ensure security and cloud-native compatibility, collaborate with cross-functional teams, document and share knowledge, mentor colleagues, and contribute to hiring. Work in a distributed agile environment with occasional travel.

Join a cross-functional product team as a Senior Backend Engineer to design and implement resilient, secure .NET microservices. Responsibilities include building and maintaining APIs, diagnosing performance issues, writing comprehensive tests, addressing security vulnerabilities, interpreting code metrics to improve maintainability, and collaborating directly with clients while staying current with technical trends.

Lead and deliver Repayment UX mobile features using React Native; define technical plans, collaborate with product/design/analytics, support production availability and on-call, mentor engineers, improve code and design standards, and drive quality and ownership across the team.

Develop and optimize algorithms for battery and renewable energy projects, analyze market data trends, and ensure algorithm performance.

Build and maintain a production Android app in Kotlin with AI-native features. Integrate chat, vision, and voice via backend APIs; design streaming UX patterns; optimize performance and memory for AI-heavy flows; implement analytics, logging, and feedback; collaborate with backend and ML teams to ensure stability, security, and scalability in production.

As a Backend Software Engineer, you'll design scalable backend systems, optimize database performance, and collaborate with front-end and DevOps teams.

Contribute to Juju's development, collaborate with teams on distributed systems, debug issues, and enhance cloud automation features.

Software Engineers at QuantCo will design and develop scalable solutions, integrate models into client businesses, and improve products based on client feedback.