Intern/ Junior Python Developer

🏢 Summary: Backend engineering role focused on building scalable backend services, APIs, and internal developer platforms in a fully remote environment. The position involves improving system architecture, optimizing distributed systems, and collaborating across the full software development lifecycle. The offer includes influence on technical decisions, modern technologies, and growth opportunities within an experienced engineering team. 🗂️ Requirements: 5+ years of backend software development experience, Proficiency in PHP or experience with Java, Python, Go, Knowledge of RESTful APIs and GraphQL, Experience building scalable distributed backend systems, Experience with SQL/MySQL and database optimization, Experience with automated testing and monitoring, Knowledge of debugging production systems, Familiarity with contract-driven development, English for daily technical communication 📃 Skills: PHP, Java, Python, Go, REST, GraphQL, SQL, MySQL, React, API 🏢 Description: ✅ Your responsibilities: ・Design, develop, and maintain scalable backend services and APIs for third-party integrations. Improve platform architecture, service communication, and internal developer tooling. Collaborate with Product Managers, Designers, and Engineers throughout the entire software development lifecycle. Optimize existing systems for performance, scalability, reliability, and maintainability. Drive engineering best practices, including code quality, testing, and documentation. Participate in architecture discussions and technical decision-making. Mentor engineers through code reviews, pair programming, and knowledge sharing. Continuously improve the developer experience by building reliable internal platforms and tools. 🧠 Our requirements: 5+ years of experience in backend software development. Strong proficiency in PHP (preferred) or solid experience with Java, Python, Go , or similar backend technologies. Strong understanding of RESTful APIs , GraphQL , and API design best practices. Experience designing and building scalable, distributed backend systems. Hands-on experience with SQL/MySQL databases and database optimization. Experience with automated testing, observability, monitoring, and debugging production systems. Familiarity with contract-driven development and modern software development practices. Basic knowledge of frontend technologies such as React is a plus. Strong communication skills and the ability to collaborate across cross-functional teams. Passion for writing clean, maintainable, and high-quality code or AI automation English at a level allowing daily technical communication 🌟 What we offer: 100% remote work. Private healthcare and Multisport. Life insurance. Real influence on technical decisions and system architecture. Opportunity to build scalable backend services and developer platforms. Work with modern technologies in a collaborative engineering environment. Knowledge sharing, mentorship, and professional growth opportunities. Friendly, supportive, and experienced engineering team.

🏢 Summary: Entry-level Backend Engineer role focused on supporting the development of backend services and REST APIs under senior guidance. The position involves contributing to production systems, writing tested and maintainable code, and collaborating within a cross-functional engineering team. Ideal for candidates with foundational Java experience seeking hands-on experience in scalable and secure systems. 🗂️ Requirements: Bachelor's degree in Computer Science or related field (or currently pursuing), Minimum 0.5 years of Java experience, Practical experience with RESTful APIs, Ability to work with HTTP methods, status codes, and JSON, Experience writing SQL queries (SELECT, JOIN, WHERE, GROUP BY) or using ORM, Basic understanding of SQL and NoSQL differences, Knowledge of data structures and algorithms, Ability to use Git in a team environment (branching, pull requests, merge conflicts), Experience writing unit tests, Experience contributing code to production through review and deployment process 📃 Skills: Java, REST, HTTP, JSON, SQL, NoSQL, ORM, Git, JUnit, Pytest, Jest, CI, Algorithms, DataStructures, APIs, Testing 🏢 Description: (5190) About This Role You will be a part of the Engineering team and reports to our Manager, Engineering. You will support the development of backend services and APIs that power customer’s products. Working under close guidance from experienced engineers, you will gain hands-on experience contributing to real-world systems while learning best practices in software development, scalability, and security. Key Responsibilities Support the development of backend services and APIs under direct supervision of senior engineers Assist with writing clean, maintainable, and well-documented code following team standards Help debug, test, and troubleshoot backend systems and services Contribute to small tasks or components within larger projects Collaborate with cross-functional teams including Frontend, Product, and DevOps Participate in code reviews and apply feedback to improve technical skills Assist in writing unit tests and validating functionality Document technical processes and development work Required Qualifications Bachelor's degree in Computer Science or a related field; Currently pursuing is also an option Strong theoretical knowledge of Java, at least 0.5 years of experience Practical experience building and consuming RESTful APIs — HTTP methods, status codes, JSON, request/response handling, basic error handling. Working knowledge of databases — has written real SQL queries (SELECT, JOIN, WHERE, GROUP BY) or used an ORM in production code; understands the difference between SQL and NoSQL at a basic level. Solid understanding of data structures and algorithms — arrays, hash maps, trees, basic Big-O analysis — sufficient to discuss simple coding problems and reason about correctness. Comfortable with Git in a team setting — branching, pull requests, code review, addressing feedback, resolving merge conflicts; has worked in a shared repository with at least one other developer. Hands-on experience writing unit tests for their own code (pytest, JUnit, Jest, or equivalent), and basic familiarity with how testing fits into a CI pipeline. Demonstrated ability to ship code to production — even small features or bug fixes — through a real review and deployment process; ability to clearly describe what they built, how it was reviewed, and how it was tested. Genuine interest in cryptocurrency, blockchain, or Web3 (self-taught is fine — owning crypto, reading, side projects, hackathons) and willingness to learn the regulated FinTech context; English level: Upper-intermediate or higher, sufficient for daily team communication and code review discussions. Bonus: exposure to Linux / command line, Docker basics, message queues (Kafka, RabbitMQ), cloud platforms (AWS, GCP), open-source contributions, hackathon participation, or an active public GitHub portfolio.

🏢 Summary: The role involves full ownership of software products, covering architecture design, development, deployment, and maintenance within distributed systems. It focuses on building RESTful microservices, automation tools, and modular components to industrialize asset management processes. The position also ensures system integration, cloud-native deployment, and ongoing optimization in a DevOps environment. 🗂️ Requirements: Advanced proficiency in Python, Experience building RESTful microservices, Experience with ETL data processing, Basic knowledge of Java, Foundational understanding of Spring Boot, Proficiency in PostgreSQL design and optimization, Familiarity with S3 or NAS storage, Experience with Kubernetes and Docker, Experience with CI/CD pipelines, Working knowledge of Linux environments 📃 Skills: Python, Java, Spring, PostgreSQL, S3, NAS, Kubernetes, Docker, Jenkins, BitBucket, Linux, ETL, REST 🏢 Description: Key Responsibilities: End-to-End Product Ownership: Manages the full software lifecycle, from initial concept and architecture design to production release and maintenance. Workflow Automation: Develops internal tools to automate data collection, remediation, and reporting to industrialize asset management processes. Modular Development: Delivers independent, high-quality software modules through iterative cycles of coding, testing, and documentation. System Integration: Ensures seamless integration and maintenance of applications within complex, distributed infrastructures. Technical Collaboration: Works closely with architects and product owners to define technical solutions and security standards. Technical Requirements: Python Expertise: Advanced proficiency in Python for building RESTful microservices, automation scripts, and ETL data processing. Basic Java Knowledge: Foundational understanding of Java and Spring Boot to support existing backend components and minor maintenance tasks. Data & Storage: Proficiency in PostgreSQL (design and optimization) and familiarity with S3 or NAS storage solutions. Cloud & DevOps: Familiarity with Kubernetes, Docker, and CI/CD pipelines (Jenkins, BitBucket) within a Linux environment.

🏢 Summary: The offer is for a Python Backend Engineer to build and maintain scalable backend services and REST APIs in a collaborative product environment. The role focuses on developing clean, well-tested code and contributing to architecture and code quality from day one. It is a fully remote position with flexible contract options and long-term international projects. 🗂️ Requirements: 3+ years of professional Python experience, Strong knowledge of FastAPI, Django, or Flask, Experience with PostgreSQL, Experience with REST API design, Proficiency with Git, Experience with pytest, Experience with CI/CD workflows 📃 Skills: Python, FastAPI, Django, Flask, PostgreSQL, REST, Git, pytest, CI/CD, AWS, GCP, Azure, Docker, Kubernetes, Kafka, Redis, RabbitMQ, Poetry, uv 🏢 Description: About the role We're looking for a Python backend engineer to join a client team and build reliable, scalable services from day one. Responsibilities Design and maintain Python-based backend services and REST APIs Write clean, tested, well-documented code Collaborate with product and DevOps teams on feature delivery Participate in code reviews and architecture discussions Requirements 3+ years of professional Python experience Solid knowledge of FastAPI, Django, or Flask Experience with PostgreSQL and RESTful API design Comfortable with Git, pytest, and CI/CD workflows Good written and spoken English Nice to have AWS, GCP, or Azure Docker / Kubernetes Kafka, Redis, or RabbitMQ Poetry or uv for dependency management pre-commit hooks and code quality tooling We offer B2B contract or employment contract (umowa o pracę / umowa zlecenie) — flexible on the form Fully remote, flexible setup Long-term engagements with international clients Dedicated recruiter support through onboarding

🏢 Summary: Senior C++ backend role focused on designing and optimizing multithreaded, production-grade features in a Linux environment. The position involves driving technical direction, improving engineering processes, and delivering complex end-to-end solutions. 🗂️ Requirements: 7+ years of professional C++ experience, Expertise in modern C++, Strong multithreading knowledge, Strong memory management skills, Experience with performance optimization, Strong Linux development experience, Experience delivering complex production-grade features end-to-end, Technical degree in Computer Science, Engineering, or related field 📃 Skills: C++, Linux, Multithreading, Memory, Optimization 🏢 Description: Responsibilities: Design, implement, and optimize multithreaded, production-grade backend features. Set technical direction and enforce coding standards. Mentor team members and guide technical growth. Introduce process improvements and adopt new technologies. Requirements: 7+ years C++ experience (modern C++ preferred). Expert in multithreading, memory management, and performance optimization. Proven experience leading technical initiatives and mentoring. Strong Linux development skills. Experience delivering complex end-to-end production features. Technical degree in CS, Engineering, or related field.

🏢 Summary: The offer is for a Backend .NET Developer responsible for building and maintaining robust backend systems while supporting full software development lifecycle and DevOps practices. The role involves working in Agile teams, ensuring high performance, scalability, and seamless integration of applications. The position also emphasizes containerization and cloud-based solutions using Azure. 🗂️ Requirements: Proven experience with .NET development, Strong knowledge of Docker, Strong knowledge of Kubernetes, Familiarity with Microsoft Azure, Experience with Azure DevOps Server, Experience working in Agile environments 📃 Skills: .NET, Docker, Kubernetes, Azure, AzureDevOpsServer, Agile, DevOps, Microservices 🏢 Description: Main Responsibilities Design, develop, and maintain robust backend solutions. Collaborate across teams to ensure seamless software integration. Participate in the full software development lifecycle. Implement DevOps practices for continuous integration and delivery. Optimize application performance and scalability. Review and improve code quality through peer reviews. Key Requirements Proven experience with .NET development. Strong knowledge of Docker and Kubernetes . Familiarity with Microsoft Azure and Azure DevOps Server . Experience working in Agile environments . Strong problem-solving skills. Nice to Have Experience with microservices architecture . Knowledge of additional programming languages. Familiarity with front-end technologies.

🏢 Summary: The offer is for a Backend .NET Developer responsible for building and maintaining scalable backend solutions within a DevOps-driven environment. The role involves full software development lifecycle participation, cloud integration, and performance optimization. The position requires collaboration in Agile teams and ensuring high code quality and seamless deployment processes. 🗂️ Requirements: Proven experience with .NET development, Strong knowledge of Docker, Strong knowledge of Kubernetes, Familiarity with Microsoft Azure, Experience with Azure DevOps Server, Experience working in Agile environments, Experience implementing CI/CD practices, Ability to optimize application performance and scalability 📃 Skills: .NET, Docker, Kubernetes, Azure, AzureDevOps, CI/CD, Agile 🏢 Description: Main Responsibilities Design, develop, and maintain robust backend solutions. Collaborate across teams to ensure seamless software integration. Participate in the full software development lifecycle. Implement DevOps practices for continuous integration and delivery. Optimize application performance and scalability. Review and improve code quality through peer reviews. Key Requirements Proven experience with .NET development. Strong knowledge of Docker and Kubernetes . Familiarity with Microsoft Azure and Azure DevOps Server . Experience working in Agile environments . Strong problem-solving skills. Nice to Have Experience with microservices architecture . Knowledge of additional programming languages. Familiarity with front-end technologies.

🏢 Summary: Part-time Backend Developer role for early-career candidates or students, focused on building and maintaining web applications using Python, Django, and microservices architecture. The position involves developing, testing, debugging, and documenting backend solutions, as well as participating in code reviews. It offers hands-on experience in modern backend development within a collaborative team environment. 🗂️ Requirements: Experience with Python, Experience with Django framework, Knowledge of RESTful APIs, Knowledge of microservices architecture, Experience with SQL, Experience with PostgreSQL, Knowledge of data modeling, Knowledge of data warehouse concepts, Knowledge of software testing methodologies, Ability to create unit tests, Understanding of clean code principles, Familiarity with design patterns, Ability to read technical documentation in English, Adherence to software development best practices 📃 Skills: Python, Django, REST, Microservices, SQL, PostgreSQL, APIs, UnitTesting, IntegrationTesting, SystemTesting, DataModeling, DataWarehouse, GitHub, GitLab 🏢 Description: Who we are looking for: We are looking for a Backend Developer, available for at least half-time, to join our team. If you are at the beginning of your professional career or currently studying, this job is for you. Responsibilities: implementing and developing software based on Python, Django, and microservices technologies, designing and developing web applications, running, testing, and debugging implemented software, creating unit tests, documenting the source code you create, conducting code reviews of source code written by other team members. Requirements: experience with Python and the Django framework, knowledge of RESTful APIs, microservices architecture, and best practices in API design, experience with SQL, especially PostgreSQL, data modeling, and data warehouse concepts, English proficiency sufficient to read technical documentation, creative, solution-oriented problem-solving skills, knowledge of software testing methodologies, including unit, integration, and system testing, openness toward others and the ability to work in a team, willingness to learn new technologies, adherence to software development best practices, knowledge and application of clean code principles, and familiarity with design patterns. Nice to have: knowledge of industry trends, emerging technologies, and best practices in software development, personal projects in your portfolio, familiarity with code repository management platforms such as GitHub or GitLab, documented ability to lead and comprehensively manage complex projects, from initial planning and scope definition through successful implementation and delivery, ensuring timely execution and alignment with business goals. We offer: sports card co-funding, company events, opportunities to learn and gain experience, prospects of working on interesting and diverse projects, participation in industry events, the possibility to work 100% remotely.

🏢 Summary: Backend Python Developer role owning end-to-end product development across backend systems, from architecture and implementation to deployment. The position focuses on building scalable applications, designing RESTful APIs, and working with cloud and data technologies. You will drive backend architecture decisions and deliver high-quality features in a production environment. 🗂️ Requirements: 8+ years of professional software engineering experience, Strong production experience with Python, Experience building scalable, high-quality applications, Deep understanding of backend architecture, Strong knowledge of RESTful API design, Strong experience with PostgreSQL, Hands-on experience with AWS, Experience with Elasticsearch, Experience working in Agile environments, Experience with Test-Driven Development (TDD) 📃 Skills: Python, PostgreSQL, AWS, Elasticsearch, REST, TDD, Agile, GCP, Snowflake, TypeScript, PHP, JavaScript 🏢 Description: Role Overview We’re looking for a Backend Python Developer to take ownership of product development across backend systems. You’ll work across the full development lifecycle — from architecture and implementation through to deployment — partnering closely with Product and Engineering. Must Have (Non-Negotiable) Strong hands-on experience with Python in production environments 8+ years of experience building scalable, high-quality software applications Deep understanding of backend architecture and RESTful API design Strong experience with relational databases (PostgreSQL preferred) Hands-on experience with AWS Proven ability to design, build, and ship end-to-end features independently Nice to Have TypeScript PHP Basic familiarity with JavaScript Elasticsearch Snowflake or modern data warehousing platforms Familiarity with GCP Key Responsibilities Product Development: Lead the development efforts, taking ownership of the entire product lifecycle from ideation to implementation. Collaborate with cross-functional teams, including product managers and engineers, to deliver high-quality products. Technical Leadership: Apply expertise in technologies to drive the adoption of new architectures and design patterns for our products. Mentor and guide junior developers, fostering a culture of continuous learning and improvement within the team. Innovation and Best Practices: Actively contribute to the evolution of our technical stack, ensuring it aligns with industry standards and supports scalability and maintainability. Cross-Functional Collaboration: Work closely with cross-functional teams to ensure backend systems effectively support product requirements. Your Professional Qualifications 🌟 Core Experience & Technical Skills Extensive Experience: 8+ years of professional experience as a Software Engineer delivering high-quality, scalable applications. Mandatory Backend Expertise: Proven, in-depth experience with Python Database Proficiency: Strong experience with relational databases, specifically PostgreSQL (Postgres). Search & Indexing: Direct experience designing, implementing, and optimizing solutions using Elasticsearch. Cloud Computing: Hands-on experience with AWS (mandatory), with familiarity with GCP as a bonus. Data Warehouse (Nice to Have): Experience working with modern data warehousing solutions like Snowflake. 🏗️ Architecture & Design Component Design: Experience with a shared component design paradigm utilizing controller-based patterns. Application Implementation: Proven track record of implementing applications effectively using established style guides and detailed wireframes. Backend Principles: Strong understanding of backend architecture principles and best practices for RESTful design. 📈 Development Methodologies & Teamwork Agile Development: Comfortable working in Agile environments and proficient in Test-Driven Development (TDD) methodologies. Collaboration: Highly team-oriented and collaborative, with the proven capacity to mentor junior team members and elevate team skill levels. Leadership & Communication: Demonstrated leadership ability combined with excellent written and verbal English skills. About Mozaiq Mozaiq is a fully remote team with roots in the US and Eastern Europe. We build powerful, cross-functional teams that support some of the most sophisticated tech and marketing organizations in the world. 🌐 Global Family: A tight-knit, multicultural, remote-first team 💼 Meaningful Work: Support world-class brands and products 🤝 Inclusive Culture: We prioritize collaboration, clarity, and growth Perks & Benefits 🌍 Work from anywhere ⏳ Flexible hours 🏝 Paid time off + holidays 🛫 Team offsites 🩺 Subsidised Health insurance

🏢 Summary: Rola senior backend/full‑stack engineera odpowiedzialnego za projektowanie i implementację usług backendowych oraz API dla nowych modeli płatności i systemów autoryzacyjnych w środowisku o wysokiej dostępności i podwyższonym rygorze bezpieczeństwa. Obejmuje współtworzenie architektury, budowę integracji, proof‑of‑conceptów oraz dbanie o skalowalność, bezpieczeństwo i jakość rozwiązań. Praca przy kluczowym systemie płatniczym z realnym wpływem na jego rozwój i niezawodność. 🗂️ Requirements: Minimum 10 lat doświadczenia jako backend / full-stack / system engineer, Bardzo dobra znajomość co najmniej dwóch języków programowania, Doświadczenie w projektowaniu API i architekturze mikroserwisowej, Znajomość kolejek, architektury zdarzeniowej i bezpieczeństwa usług, Doświadczenie w pracy z bazami danych SQL i NoSQL, Umiejętność tworzenia złożonych integracji systemowych, Doświadczenie w środowiskach o wysokiej dostępności lub podwyższonym rygorze bezpieczeństwa, Doświadczenie z technologiami Open Source, Samodzielność w prowadzeniu prac projektowych, Umiejętność analizy dokumentacji technicznej i proponowania rozwiązań 📃 Skills: API, Microservices, SQL, NoSQL, OpenSource, Queues, EventDriven, Security, Blockchain, Ethereum, Hyperledger, Cosmos, Substrate, ITIL, AI, RAG, VectorDB 🏢 Description: Twój zakres obowiązków Projektowanie oraz implementacja usług backendowych i API dla nowych modeli płatności oraz systemów autoryzacyjnych Tworzenie prototypów i usług integracyjnych działających w środowisku o wysokiej dostępności Współpraca z liderem technicznym przy projektowaniu architektury nowych rozwiązań Uczestnictwo w procesie analizy technologicznej i wyborze narzędzi Tworzenie kodu produkcyjnego oraz proof-of-concepts dla nowych funkcjonalności Dbanie o bezpieczeństwo, skalowalność i jakość implementowanych usług Współpraca z osobą odpowiedzialną za warstwę biznesowo-regulacyjną oraz z pozostałymi członkami zespołu technicznego Wspieranie procesów testowych i wdrożeniowych Nasze wymagania Minimum 10 lat doświadczenia w roli backend software engineer / full-stack engineer / system engineer. Bardzo dobra znajomość przynajmniej dwóch języków programowania Zdrowe fundamenty architektoniczne: API design, mikroserwisy, kolejki, zdarzenia, bezpieczeństwo usług Umiejętność pracy z bazami danych (SQL/NoSQL) oraz tworzenia złożonych integracji Samodzielność w prowadzeniu prac projektowych oraz zdolność do działania w obszarach bez gotowych rozwiązań Doświadczenie w pracy w środowiskach o podwyższonym rygorze bezpieczeństwa lub wysokiej dostępności usług Doświadczenie w pracy z technologiami Open Source Umiejętność czytania i rozumienia dokumentacji technicznej oraz proponowania rozwiązań Mile widziane Znajomość wyzwań związanych z low-latency, event-driven architecture, real-time processing. Znajomość technologii blockchain (Ethereum, Hyperledger, Cosmos, Substrate itp.). Znajomość zagadnień ITIL lub posiadanie podstawowych certyfikatów. Rozumienie tokenizacji aktywów, modeli emisji, systemów rejestrów. Praca z agentami AI, orchestratorami, RAG, systemami wektorowymi. Tworzenie botów lub API do automatycznych agentów wykonujących procesy decyzyjne. To oferujemy Pracę przy jednym z najważniejszych systemów płatniczych w Polsce, który codziennie obsługują miliony użytkowników. Realny wpływ na bezpieczeństwo i dostępność usług płatniczych. Możliwość rozwoju kompetencji technicznych i operacyjnych. Przyjazne środowisko, nastawione na współpracę i ciągłe doskonalenie. Elastyczne godziny pracy oraz model hybrydowy. Pakiet benefitów (opieka medyczna, ubezpieczenie, język angielski, platforma e-learningowa, MyBenefit, MultiSport). Budżet rozwojowy i dostęp do szkoleń branżowych.