(Senior) Fullstack Engineer (Python + React.js) - Freelance

Join our dynamic team of over 500 experts who are at the forefront of developing innovative proxy and web data scraping solutions for thousands of globally recognized enterprises, including numerous Fortune 500 companies.What Awaits You:You will tackle intricate challenges while overseeing our extensive infrastructure, managing over 60PB of data traffic mont…

N-iX is seeking a highly skilled Senior Python Engineer to join a dynamic product team of approximately 8 engineers dedicated to creating a sophisticated, high-impact software platform. In this role, you will engage in full-stack development, constructing scalable backend services and user-friendly frontend experiences. You will leverage AI-powered development tools to enhance productivity and code quality. Our team adheres to Agile best practices, emphasizing clean architecture, ownership, and continuous improvement.You will play a crucial role in developing a next-generation endpoint protection (EPP) and endpoint detection and response (EDR) solution designed for enterprise environments. This solution operates seamlessly across Windows, macOS, Linux, and server environments, functioning as a unified agent to prevent, detect, respond to, and rectify cyber threats—including malware, ransomware, fileless attacks, and advanced persistent threats—in real time.

Join our innovative team at dev2 as a Senior Software Engineer specializing in Python. In this pivotal role, you will be responsible for designing, developing, and maintaining robust software solutions that drive our projects forward. Your expertise will guide the team in best practices and efficient coding methodologies, ensuring high-quality deliverables.You will collaborate with cross-functional teams to integrate new features, troubleshoot issues, and enhance system performance. If you are passionate about software development and eager to take on challenging projects, we want to hear from you!

What You Will Do:Contribute to the development and optimization of our Django-based Billing Engine operating within a Kubernetes (K8s) environment, prioritizing performance and dependability.Engage in the complete software development lifecycle, with a focus on system architecture, design, implementation, and ongoing maintenance.Collaborate closely with product managers, development teams, and QA to establish feature specifications and deliver top-notch solutions.Integrate with existing services through APIs and message brokers to ensure smooth data exchange and system interoperability.Architect and implement systems that adhere to high availability and disaster recovery standards.Participate in code reviews and share insights to enhance code quality, software architecture, and user experience.

Join our dynamic team as a Senior DevOps Engineer and play a key role in shaping the future of cloud security!About Us:At nix, we collaborate closely with our client’s team to develop a cutting-edge cloud-based security platform. As a backend engineer with robust infrastructure expertise, you will contribute to innovative solutions that empower security teams to conduct forensic investigations, execute custom scripts at scale, and swiftly respond to cyber threats affecting millions of endpoints.This next-generation platform facilitates the automated collection of forensic evidence, customizable forensic profiles, and efficient incident response workflows, all through a unified console integrated with EDR data.Your focus will be on modernizing our platform through infrastructure migrations to enhance scalability.

Role overview SmartRecruiters is seeking a Senior Software Engineer with strong Python skills to join the team in Poland. This role focuses on building and enhancing scalable software that supports the company’s product suite. Senior engineers at SmartRecruiters play a key part in shaping technical decisions and work closely with colleagues from various teams. What you will do Design and implement software solutions using Python Work with product managers, designers, and engineers to deliver new features Promote development best practices and contribute to architectural choices Mentor junior engineers and help them grow technically Requirements Experience building scalable applications with Python Comfort working in a collaborative setting that can move quickly Interest in solving practical problems with technology Ability to share knowledge and support less experienced team members

Kaseya delivers IT infrastructure and security management solutions to Managed Service Providers and internal IT teams around the world. Founded in 2000, the company operates in more than 20 countries and manages over 15 million endpoints across various industries. Backed by Insight Venture Partners, Kaseya continues to expand its global reach. More information is available at www.Kaseya.com. Role overview The networking products team in Krakow seeks a QA Automation Engineer (Python) who will focus on both automated and manual testing. The position centers on building and maintaining scalable test automation frameworks and collaborating with engineering teams to validate new features and improve product quality. What you will do Design, develop, and maintain automated test frameworks with Python, Pytest, and Playwright. Create reliable, reusable test scripts for web and API testing. Work closely with developers to validate new features and enhance functionality. Participate in design and requirements reviews to support testability and quality standards. Perform manual testing as needed for comprehensive QA coverage. Identify, document, and track defects through resolution. Develop and maintain test plans, test cases, and related documentation. Continuously improve testing processes, tools, and strategies. Ensure all QA activities align with company and industry best practices and compliance standards.

Are you passionate about creating powerful systems that enhance financial independence? Join DolarApp, a visionary startup dedicated to transforming access to dollar-based financial services throughout Latin America. As a Senior Python Engineer, you will architect, develop, and sustain scalable, secure, and high-performing backend systems that fuel our groundbreaking products. Collaborate with a skilled team to devise solutions that promote financial inclusion and revolutionize how individuals manage their finances. If you're eager to tackle intricate challenges and contribute significantly to a rapidly expanding company, we want to hear from you!What You'll Be DoingYou will be instrumental in developing the foundational infrastructure that supports our operations, including customer support bots and fincrime AI agents that will transform fintech operations.You will adopt a pragmatic approach to crafting our business logic, prioritizing clean code and maintainability, with a focus on rapid development through Test-Driven Development (TDD), Domain-Driven Design (DDD), and continuous integration and delivery.

Client Overview:We are partnering with a leading SaaS company at the forefront of technology, specializing in innovative solutions for the detection and management of risks that could influence clinical trial outcomes. Our client’s unique algorithms analyze clinical and operational data in real-time, enabling the identification of outliers and anomalies effectively.Role Overview:Join a vibrant engineering team of over 100 professionals dedicated to advancing data-driven statistics, machine learning, and AI software solutions. As a Senior Python Engineer, you will be instrumental in integrating AI-driven development practices into our dynamic workflow. Collaborating with a talented cohort of Python developers, you will address significant engineering challenges while utilizing a tech stack that includes Python, FastAPI, Kubernetes, Docker, Flask, Pyramid, Git, MySQL, MongoDB, Azure Cosmos DB, Celery, and Temporal.

Join the forefront of online security technology!Are you a passionate problem-solver eager to make your mark? Become a vital part of our innovative team at Nordsec, creators of Threat Protection Pro, the NordLynx protocol, and the fastest VPN available today. Our cutting-edge tools empower individuals to reclaim their online privacy, enhance security, and maintain control over their personal data.Your contribution: Play a crucial role in helping millions of users regain their online security, privacy, and data integrity.

About the Role Nearmap is looking for a Software Engineering Manager to guide the Web Platform team in Warsaw. This role involves leading engineers focused on building and improving web solutions that support user experience and business objectives. What You Will Do Direct a team of engineers working on the web platform Work with cross-functional groups to clarify project needs and set schedules Oversee delivery of software projects, keeping quality and deadlines in focus Encourage a culture centered on technical growth and ongoing improvement Location This position is based in Warsaw.

Join our dynamic team at Inetum Polska as a Python Software Engineer, where you'll play a pivotal role in the development and upkeep of cutting-edge data processing solutions tailored for a vast telecommunications environment. Your primary focus will be on crafting Python-based modules that efficiently load, transform, and analyze network data, in addition to creating supportive tools for monitoring, reporting, and SLA-related processes.Key Responsibilities:Design and implement new Python modules for effective data processing within telecommunications networks.Develop and sustain software that enhances network quality monitoring, comprehensive reporting, and SLA calculations.Construct and optimize Python scripts for data loading and transformation in Oracle databases.Engage in ongoing transformation projects to enhance our technical environment.Provide support and maintenance for existing solutions in production.Participation in on-call support (24/7) may be required, typically one week per month. This rotation is currently inactive but could be reinstated in the future, with readiness to participate if needed.

Company Overview:Twisto, a Param Company, is a forward-thinking financial services provider revolutionizing payment methods in Central and Eastern Europe. Our innovative app empowers users with complete control over their financial transactions, enabling them to defer or split purchases, share expenses, pay invoices, and shop using both virtual and physical cards. We are committed to providing transparency, convenience, and competitive exchange rates both locally and globally. Our mission is to continuously innovate and expand our offerings to simplify everyday financial tasks for our customers.Your Future Responsibilities:We are seeking a dedicated Python Engineer to join our dynamic team! In this role, you will collaborate with Engineering Managers, Product Analysts/Managers, and fellow engineers to enhance user stories, define requirements, and assist in prioritizing and executing tasks throughout the software development life cycle.Key Responsibilities:Design, develop, and maintain Python applications with an emphasis on writing clean, reliable, and maintainable code.Transform business requirements into viable technical solutions.Implement new features, conduct code reviews, provide technical support, and resolve bugs.Contribute to system architecture design and ensure that technical documentation remains current.Engage actively in code reviews and promote high engineering standards within the team.Effectively communicate with stakeholders and team members regarding technical solutions and project updates, both verbally and in writing.Our technology stack is constantly evolving, but currently includes the following tools: Languages: Python.Tools: Kubernetes, Terraform, Docker, AWS Cloud, Grafana, Firebase.Methodologies: Agile, Scrum; we operate on 14-day sprints, with stand-ups conducted online via Slack.

Join our dynamic team at Capco as a Quality Assurance Engineer, where you will play a crucial role in ensuring the quality and reliability of our software solutions. You will work with cutting-edge technologies like Playwright and Python to develop automated tests and improve our testing processes.This position is perfect for individuals who are passionate about technology and quality assurance, eager to contribute to innovative projects in a collaborative environment.

Join the forefront of digital security with Nord Security!As a part of our innovative team, you'll contribute to the development of cutting-edge tools like Threat Protection Pro and the NordLynx protocol, ensuring that millions regain control over their online privacy and security.Your Role: As a Senior Software Engineer, you will design and maintain services that enhance our Threat Intelligence capabilities.Main Responsibilities:Design, code, and maintain data curation and ingestion services for the Threat Intelligence team.Develop and implement architectural solutions for distributed computing pipelines and microservices.Participate actively in code reviews and knowledge sharing to uphold high technical standards.Create new services to ensure the availability of quality data feeds.Maintain coding standards and ensure your code is maintainable, readable, and secure.Encourage innovation and develop ideas that enhance our cybersecurity products.Provide technical leadership and mentorship to team members.

Location: Poland (Remote/Flexible) About Us: RTB House is a leading global company specializing in advanced marketing technologies tailored for top brands and agencies around the globe. Our innovative ad-buying engine, the first of its kind fully powered by Deep Learning algorithms, empowers advertisers to achieve remarkable results and fulfill their objectives at every stage of the marketing funnel. The Bidding Platform division is at the heart of RTB's operations, handling over 20 million requests per second to engage in real-time auctions and display advertisements to audiences across more than 90 countries. The Ad Display Team, which this position pertains to, is a newly formed group within the Bidding Platform focused on guaranteeing the smooth, high-quality, and reliable display and tracking of advertisements. This is an exciting opportunity for those eager to tackle technically challenging solutions!

Join Netguru, a leading partner in digital commerce, as we empower top-tier brands to modernize their B2B solutions, marketplaces, and retail ecosystems. Since our inception in 2008, we have been at the forefront of technology innovation, utilizing AI-driven personalization and exceptional engineering and design expertise. As a certified B Corporation®, we proudly serve renowned clients such as IKEA, VW, OLX, Delivery Hero, Żabka, Wolt, Careem, and Vinted.What to Expect as a Netguru Freelancer:At Netguru, we offer the flexibility you crave. You have the autonomy to decide when, where, and how you work on projects, ensuring a perfect fit with your skills. We provide numerous opportunities across various industries, allowing you to enhance your experience and expand your skill set.Furthermore, our freelancers can enjoy the perks of full-time collaboration, becoming integral members of our team.Ready to leave your mark? Join us in creating beautiful software that makes a difference.Location: Preferably Warsaw, PolandWork Model: Hybrid - At least once a week at the Client's office in WarsawContract Type: B2BCompensation: Up to 100 PLN/h (NET)Contract Duration: Start Date: 13/04/2026, End Date: 09/10/2026Language Requirement: Polish C1

Join Valtech, a leading experience innovation company and trusted partner to the world’s most recognized brands. We pride ourselves on offering our team members unparalleled growth opportunities, a values-driven culture, international career prospects, and the chance to actively shape the future of digital experiences.The OpportunityAs a Senior Python Engineer at Valtech, you will immerse yourself in an environment that champions continuous learning, impactful work, and professional development. Your contributions will range from pioneering cutting-edge AI solutions to redefining customer experiences, ultimately transforming entire industries.

Join Our Team as an Integration Engineer!We are seeking a talented Integration Engineer to become a vital part of our team, collaborating with prestigious clients from the high-end American IT market.In this role, you will engage in an exciting project with a US-based company, developing a sophisticated revenue management platform aimed at the hospitality industry. This platform automates pricing decisions, optimizes inventory, and forecasts demand for thousands of hotels worldwide. Our technology stack primarily consists of Python, AWS, and modern data integration patterns, allowing you to work with both well-established companies and innovative startups at various stages of development.Experience the freedom of working within the Polish time zone while forging connections with clients from the elite IT sector.