304 freelance English-speaking jobs in Poland

We are looking for a Senior Backend Developer to join our Optimization Team at Programmers Force. In this role, you will focus on optimizing backend systems for performance, scalability, and efficiency while working on large-scale, high-traffic workloads. Your responsibilities will include refactoring backend code, improving database queries and indexing, troubleshooting bottlenecks, and collaborating with cross-functional teams to scale backend architecture. You will ensure systems remain secure, reliable, and efficient while mentoring junior team members and enhancing test coverage. The ideal candidate has 4+ years of backend development experience with strong expertise in PHP (Laravel), Node.js, Python, MongoDB, and relational databases (MySQL, PostgreSQL). You should also be proficient in API development (REST/GraphQL), performance optimization, Docker, Git, and CI/CD practices. Experience with Redis, RabbitMQ, AWS/Azure, and backend security best practices will be considered a plus.

Job Title: Freelance Maintenance Engineer - Medical Devices Location: On-site, Poland Contract Type: ... Freelance Start Date: Immediate / Negotiable Duration: Initial 12 months, with potential for extension ... Overview: We are recruiting a Freelance Maintenance Engineer to support on-site operations at a medical

Medical Consultant - Freelance KOL / SME for Internal Medicine Medical Consultant - Freelance KOL / SME ... Medical Consultant - Freelance KOL / SME for Neurology (Pain Specialist) Join to apply for the Medical ... to apply for the Medical Consultant - Freelance KOL / SME for Neurology (Pain Specialist) role at TFS ... - Freelance KOL / SME for Neurology (Pain Specialist) 2 weeks ago Be among the first 25 applicants Join ... HealthScience Freelance Opportunity | TFS HealthScience TFS HealthScience is a leading global mid-size

Freelance DevOps - Apache Superset Deployment Automation Join to apply for the Freelance DevOps - Apache ... 17 hours ago Be among the first 25 applicants Join to apply for the Freelance DevOps - Apache Superset ... Superset Deployment Automation role at People More Freelance DevOps - Apache Superset Deployment Automation ... For the project that we are working on with our foreign partner, we are looking for Freelance DevOps ... Team Lead DevOps - Freelance for 1-2 months project (Senior) QA Engineer - International service (fluent

(freelance side project) role at Blazity Senior Ruby On Rails Engineer (freelance side project) 2 days ... Senior Ruby On Rails Engineer (freelance side project) Join to apply for the Senior Ruby On Rails Engineer ... ago Be among the first 25 applicants Join to apply for the Senior Ruby On Rails Engineer (freelance ... About The Project We’re looking for a Senior Ruby On Rails Engineer for a freelance engagement . ... stakeholders and technical teams Ability to support or advise on technical team composition and recruitment Freelance

Join to apply for the Salesforce DevOps (freelance) role at PwC Polska 3 days ago Be among the first ... 25 applicants Join to apply for the Salesforce DevOps (freelance) role at PwC Polska Get AI-powered advice ... We are looking for: Salesforce DevOps (freelance) Your future role: Operate, support and improve the

We’re currently looking for a freelance Linux Embedded Engineer to join a specific IoT project to work ... The work is fully remote, with flexible hours, and we are open only to B2B/freelance cooperation. ... protocols knowledge of RTOS (e.g., FreeRTOS) scripting in Bash or Python Practical info Type of contract: freelance

Freelance Software Developer (C++) - AI Trainer Freelance Software Developer (C++) - AI Trainer 2 months ... Take part in a part-time, remote, freelance project that fits around your primary professional or academic ... switch between tasks and topics quickly and sometimes work with challenging, complex guidelines Our freelance ... laptop, internet connection, time available and enthusiasm to take on a challenge Benefits Why this freelance ... Consulting Referrals increase your chances of interviewing at Mindrift by 2x Get notified about new Freelance

Freelance Software Developer (Java) - AI Trainer Development Scientist (Associate Director) Business ... - Business Development Manager Freelance Software Developer (Python) - Quality Assurance (AI Trainer ... Development Manager Poland (d/f/m) Senior Frontend Developer - React / React Native Freelance Software ... ) Freelance Software Developer (C#) - AI Trainer Senior Fullstack Developer (Frontend Oriented) Senior ... Developer (C++) - AI Trainer Freelance Software Developer (Python) - AI Trainer Junior Account Manager

Freelance Senior Game Tester (Functionality) - Warsaw TransPerfect Games is looking for freelance novice

We’re currently looking for a freelance Linux Embedded Engineer to join a specific IoT project starting ... The work is fully remote, with flexible hours, and we are open only to B2B/freelance cooperation. ... Practical info Duration: 6 weeks (starting August 18) Type of contract: freelance / B2B only Location

Medical Consultant - Freelance KOL / SME for Internal Medicine Medical Consultant - Freelance KOL / ... Clinical Research Medical Advisor - Poland Medical Consultant - Freelance KOL / SME for Internal Medicine ... SME for Neurology (Pain Specialist) Medical Consultant - Freelance KOL / SME for Neurology (Pain Specialist

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We’re looking for someone experienced to join our Copywriting & Translations team as a Freelance Copywriter

What we need from you: As a Freelance Graphic Designer , your portfolio is a must-see! ... visual trends, understand product design, and want to join a dynamic team, then we have the perfect freelance

spoken) Availability for full-time cooperation (B2B contract only) Requirements What do we mean by freelance ... Consulting Referrals increase your chances of interviewing at Monterail by 2x Sign in to set job alerts for “Freelance

Medical Consultant - Freelance KOL / SME for Neurology (Pain Specialist) Medical Consultant - Freelance ... Medical Consultant - Freelance KOL / SME for Internal Medicine Clinical Research Medical Advisor - Poland ... Medicine Medical Affairs Manager (M/F) - Immunology (Dermatology & Rheumatology) Medical Consultant - Freelance

Mid/ Senior Presentation Designer Freelance Join to apply for the Mid/ Senior Presentation Designer Freelance

Backend Developer (Cyber Security) Junior Software Engineer - Cross-platform C++ - Multipass Freelance ... [VKS] Software Engineer (Java & NodeJS/TypeScript) Freelance Software Developer (Java) - AI Trainer Python ... with German (React&Angular) Python Backend Senior Software Engineer - Remote 4 days a week (Europe) Freelance

We are looking for: Salesforce DevOps (freelance) Your future role: Operate, support, and improve tools