Senior Python Engineer

🏢 Summary: Senior Software Engineer role focused on building and scaling high-throughput logistics services using Python, routing algorithms, and geospatial technologies. The position involves developing delivery optimization solutions, microservices architecture, and routing systems for first-mile and last-mile logistics operations. 🗂️ Requirements: 4+ years of commercial backend development experience with Python and SQL, Knowledge of logistics domain, network analysis, and routing, Experience with graph theory, road network modeling, or VRP, Experience with geospatial data and spatial indexing, Knowledge of Google Cloud Platform, Experience with Kubernetes, Terraform, and Airflow, Understanding of Clean Code, TDD, CI/CD, and code review practices, Ability to design and scale microservices architecture, University degree in computer science or related technical field, Good command of English and Polish, Availability for monthly workshops in Warsaw 📃 Skills: Python, SQL, GCP, Kubernetes, Terraform, Airflow, PostGIS, H3, VRP, CI/CD, TDD, Microservices 🏢 Description: We are looking for a Senior Software Engineer specializing in Python and routing algorithms. In this role, you will support the design and scaling of high-throughput services that power first-mile and last-mile delivery logistics. Our expectations - Min. 4 years of commercial experience in backend software development using Python and SQL. - Experience in or very good knowledge of the logistics domain, network analysis, and routing (e.g., graph theory, road network modeling, Vehicle Routing Problem – VRP). - Experience with programmatically utilized geospatial data (e.g., H3, spatial indexing, clustering algorithms, PostGIS). - Knowledge of cloud environments (Google Cloud Platform preferred) and modern infrastructure tools (Kubernetes, Terraform, Airflow). - Promote engineering best practices, such as: Clean Code, TDD (Test Driven Development), CI/CD, rigorous code review. - Ability to design and scale microservices-based architecture. - Positive attitude, strong teamwork skills, and hold a university degree in computer science or a related technical field. - Good command of English and Polish. - Readiness to participate in workshops at the client's office in Warsaw once per month. Key tasks - Supporting the design and scaling of high-throughput services powering first-mile and last-mile delivery logistics operations. - Co-developing the next-generation Delivery Optimization Engine (DOE) using network analysis and spatial optimization. - Developing and implementing routing algorithms. - Directly impacting and improving the efficiency of logistics processes.

🏢 Summary: Senior Python Engineer role focused on building and scaling a cloud-native real-time Data Platform handling massive datasets. The position involves developing high-performance backend services, optimizing distributed systems, and integrating large-scale data storage solutions. Hybrid work model in Warsaw with employment benefits including private medical care and multisport card. 🗂️ Requirements: 8+ years of backend software development experience, Advanced Python expertise, Experience with scalable production-grade systems, Knowledge of concurrency and multiprocessing, Experience with Pandas or NumPy, Experience with Parquet or JSON data formats, Knowledge of relational and NoSQL databases, Experience with performance optimization and low-latency systems, Ability to use AI-assisted development tools responsibly 📃 Skills: Python, Pandas, NumPy, Parquet, JSON, SQL, NoSQL, API, OOP, Concurrency, Multiprocessing, Algorithms, Databases, Cloud 🏢 Description: For our client, a leading, high-growth global fintech company – we are looking for an experienced Senior Python Engineer to join a key engineering team responsible for the company’s core data foundation. The project focuses on building, optimizing, and scaling a cloud-native, high-throughput Data Platform designed to ingest, process, and distribute massive datasets in real-time. This platform serves as the backbone for various downstream analytical systems, requiring extreme reliability, performance, and scalability. This is a fantastic opportunity for a strong Python generalist who enjoys solving complex distributed system problems, optimizing data flows, and working with modern cloud architectures. Responsibilities Backend & Pipeline Development: Design and develop scalable backend services and high-performance data processing pipelines using Python. Performance Tuning: Identify bottlenecks and optimize system performance, focus on concurrency, throughput, and low-latency execution. Data Integration & Storage: Build robust integrations with modern cloud-native storage solutions and databases to manage large-scale datasets efficiently. Collaborative Engineering: Work closely with cross-functional technical teams to understand data requirements and deliver reliable API services and platform features. Engineering Excellence: Maintain top-tier coding standards, emphasizing clean code, robust testing (unit/integration), automation, and security. Requirements 8+ years of professional backend software development experience (with a strong track record in building scalable, production-grade systems). Deep expertise in Python (advanced OOP, concurrency/multiprocessing, memory management, data structures, and algorithms). Solid experience with data-centric libraries such as Pandas, NumPy, or similar data processing frameworks. Experience with large-scale data storage formats (e.g., Parquet, JSON, or column-oriented databases) and relational/NoSQL databases. AI-assisted development mindset: Comfortable utilizing AI tools  to accelerate delivery, while maintaining strong developer judgment regarding validation, testing, security, and refactoring. What our client offers: Hybrid work model in Warsaw (minimum 3 days a week in the office - strictly non-negotiable). Contract of Employment (UoP) with increased tax-deductible costs (KUP). Private medical care (including full dental care). Lunch card to cover your daily meals. Multisport card.

🏢 Summary: Senior Python Developer role in a startup-like environment focused on designing and delivering high-performance, scalable systems for demanding clients. The position involves full ownership of features from architecture to deployment, solving complex engineering problems, and shaping technical direction. It requires working under pressure with rapidly changing priorities while ensuring code quality and system reliability. 🗂️ Requirements: 5+ years commercial software development experience, Strong professional experience with Python, Excellent knowledge of Python 3.11+, Production experience with FastAPI or Falcon and Async SQLAlchemy 2.0, Strong expertise in REST and GraphQL API design, Solid understanding of relational and non-relational databases, Advanced knowledge of OOP, SOLID, YAGNI, TDD, Extensive experience with pytest, CI/CD pipelines, Docker, deployments, Experience building scalable, low-latency systems, Very good written and spoken English 📃 Skills: Python, FastAPI, Falcon, SQLAlchemy, REST, GraphQL, PostgreSQL, MongoDB, Redis, Elasticsearch, pytest, Docker, CI/CD, AWS, Azure, OOP, SOLID, TDD 🏢 Description: Startup Environment, High Ownership, Demanding Clients Join our startup-like environment filled with new ideas, rapid change, and a strong focus on priorities and delivery. We are looking for a Senior Python Developer - someone experienced, open-minded, and ready to take real ownership of both product and technical direction. You will work closely with demanding clients , solve complex engineering problems, and help shape ambitious, high-performance systems. This role is for engineers who enjoy responsibility, fast feedback loops, architectural challenges, and working under pressure . Your primary responsibilities beyond the will to change the world: Act as a technical partner for clients : analyze business needs, challenge requirements, and propose effective, scalable solutions Take full ownership of complex features - from concept and architecture through implementation, testing, and automated deployment Design system architecture, APIs, and data models for high-load, data-intensive systems Deliver core and business-critical components of projects Work in a dynamic, startup-style environment with changing priorities, tight deadlines, and real product pressure Proactively identify risks, bottlenecks, and technical debt , and drive improvements Ensure high code quality, performance, and reliability Support and mentor other developers, helping raise engineering standards across teams Must have: 5+ years of commercial software development experience, including strong professional experience in Python Excellent knowledge of Python 3.11+ (typing, dataclasses, modern best practices) Production experience with modern Python frameworks ( async FastAPI preferred, Falcon welcome, Async SQLAlchemy 2.0 ) Strong expertise in API design (REST, GraphQL) Solid understanding of databases and data-driven systems (relational, document, search, key-value stores) Advanced knowledge of software engineering principles (OOP, SOLID, YAGNI, TDD) Extensive experience with unit testing (pytest), CI/CD pipelines, Docker, and deployments Proven ability to build efficient, low-latency, scalable systems Confidence working with tight deadlines, pressure, and frequently evolving requirements Very good written and spoken English Strong communication skills and a proactive, ownership-oriented mindset Experience we'd appreciate, too: Experience in system architecture and technical leadership Asynchronous programming and high-concurrency systems Messaging systems and distributed architectures DDD and event-driven design Cloud and DevOps experience ( AWS / Azure ) Mentoring and influencing technical direction of projects Nice to have: Community involvement (meetups, open source, speaking) Writing technical articles or internal knowledge-sharing A list of benefits is long so we will mention only about the crucial ones: Challenging projects with real business impact Work in a startup-like environment : fast decisions, autonomy, responsibility 100% remote or office in Poland (Wrocław / Zielona Góra) Sport subscription Private healthcare

🏢 Summary: Senior Python Developer role focused on building and maintaining high-performance backend services and REST APIs using Python and FastAPI in a fully remote environment. The position involves designing scalable solutions, integrating with internal and third-party systems, and contributing to architectural decisions and CI/CD improvements. You will work on core product services with strong ownership and emphasis on clean, testable code. 🗂️ Requirements: 5+ years commercial experience with Python, Strong production experience with FastAPI, Experience designing and building REST APIs, Knowledge of async programming, Understanding of authentication and data validation, Experience with SQL databases (PostgreSQL or MySQL), Experience with at least one NoSQL database (Redis or MongoDB), Experience with Docker, Experience with Git, Experience with CI/CD pipelines, Experience writing tests with pytest 📃 Skills: Python, FastAPI, REST, SQL, PostgreSQL, MySQL, Redis, MongoDB, Docker, Git, CI/CD, pytest, Async 🏢 Description: About us We are a fast-growing iGaming company building modern, scalable products for international markets. We work in a fully remote, international setup and value clean code, ownership and pragmatic engineering over buzzwords. About the role We are looking for a Senior Python Developer with strong FastAPI experience to join our backend team. You will be designing and developing high-performance services that power our core products, working closely with product, design and other engineers. What you'll do - design, build and maintain backend services and REST APIs using Python and FastAPI - integrate with internal and third-party systems - write clean, testable, well-documented code - participate in code reviews, technical discussions and architectural decisions - contribute to improving our development practices, CI/CD and code quality What we expect - 5+ years of commercial experience with Python - strong, hands-on experience with FastAPI in production - solid background in web development (REST API design, async, auth, data validation) - good command of SQL databases (PostgreSQL/MySQL) and at least one NoSQL store (Redis, MongoDB) - experience with Docker, Git and CI/CD pipelines - comfortable writing tests (pytest) - English at B2+ level Nice to have - experience in iGaming, fintech or other high-load industries - message queues (RabbitMQ, Kafka, Celery) - cloud platforms (AWS/GCP) - Pydantic, SQLAlchemy, Alembic - microservices and event-driven architecture What we offer - B2B contract, fully remote - competitive salary in EUR - international, English-speaking team - modern tech stack and real ownership of what you build - flexible working hours

🏢 Summary: Senior Fullstack Engineer role focused on building and scaling an AI-powered drive-thru platform for a QSR client. The position involves developing integrations with POS systems and digital menu boards, building data pipelines, and leading end-to-end integration projects in production environments. The engineer will also troubleshoot complex issues and drive technical delivery in a cloud-based ecosystem. 🗂️ Requirements: 7+ years experience in Python and JavaScript, Strong backend development skills, Strong software architecture skills, Experience delivering and deploying production projects, Proficiency with Async IO, Experience with React and Redux (RTK), Experience with CI/CD pipelines, Experience with cloud platforms (AWS/GCP/Azure), Experience with Linux environments, Experience with Docker and Kubernetes, Experience with 3rd party API integrations, Experience building Data Pipelines and ETL processes, BSc in Software Development or equivalent experience, 1+ year of technical leadership experience 📃 Skills: Python, JavaScript, React, Redux, CSS, AsyncIO, CI/CD, AWS, GCP, Azure, Linux, Docker, Kubernetes, APIs, ETL, SQL 🏢 Description: Join a QSR client as a Senior Fullstack Engineer and help develop an AI drive-thru platform that scales faster, smarter, and more accurately. RESPONSIBILITIES In this role, you will: Integrate with new POS systems and digital menu boards Build data pipelines to process restaurant menus Support existing integrations and pipelines Debug and solve complex customer issues Lead communication with integration partners to deliver the integrations Estimate, plan and deliver the integration projects Handle a large set of complex and diverse customer issues Create documentation for integrations REQUIREMENTS 7+ years experience in Python and JavaScript Strong backend development and software architecture skills Experience in developing and deploying multiple projects used in production Proficient with Async IO Experience with React, Redux (RTK), CSS modules Experience with CI/CD, Clouds (AWS/GCP/Azure), Linux, Docker, Kubernetes, 3rd Party API integrations Experience with Data Pipelines, ETL Prior experience working in startups BSc in Software Development or equivalent industry experience 1+ years of experience in technical leadership WHAT DO WE OFFER ON THIS PROJECT? Cooperation based on a B2B contract. 100% remote work. The support of a dedicated mentor. In the relationship, we focus on direct communication. When you join speedapp, you will be put in touch with a dedicated mentor who will make sure that you enjoy working with us and with the client. Events and integration meetings, as well as participation in various initiatives, e.g., sports. Access to the benefits offering (medical care, life insurance, Multisport card). WHAT DOES THE RECRUITMENT PROCESS LOOK LIKE? Application: Apply and submit your CV. After the application review, the recruiter will contact selected candidates by phone. Screening: Have a conversation with a speedapp recruiter about your experience. Next steps: The speedapp recruiter will explain the recruitment process for the specific position. The speedapp recruiter will stay in touch with you throughout the entire process. ABOUT SPEEDAPP At speedapp, we believe that an organization is only as good as the people who make it up. We are a team of IT experts and other professionals working for our clients around the world (including Israel, Austria, USA). We go far beyond the HR category. We build IT teams and also help manage them. 👉 10 years of experience 👉 +100 clients worldwide +300 hires per year 💎 We have won the prestigious "Forbes Diamonds" award four times (2022, 2023, 2024, 2025). We are a member of the European Fast Growth Icons network and FinTech Poland. We are ranked 18th among the 100 fastest growing companies 2023 by Clutch. DO YOU HAVE ANY QUESTIONS? Contact the recruiter responsible for this process directly. Barbara Krawczyk Junior IT Delivery Consultant barbara.krawczyk@speedapp.pl +48 734 469 838

🏢 Summary: Senior Python Engineer role focused on building and deploying enterprise-grade, AI-powered solutions in a cloud-based microservices environment for a large-scale professional services project. The position involves end-to-end development of scalable Python applications, integration of Generative AI and LLM capabilities, and technical leadership within a cross-functional team. Offered as a remote B2B contract with a competitive hourly rate. 🗂️ Requirements: 5+ years of commercial experience in software development, Strong hands-on experience with Python and FastAPI, Practical knowledge of Pydantic for schema modelling and data validation, Experience with asyncio and asynchronous/parallel programming, Experience with Generative AI and Large Language Models in real business use cases, Understanding of RAG pipelines and hybrid search with vector databases, Strong analytical and problem-solving skills, Very good organizational and self-management skills, Strong troubleshooting and communication skills, English level Intermediate+ 📃 Skills: Python, FastAPI, Pydantic, asyncio, LLM, RAG, LangChain, LangGraph, Azure, MongoDB, AzureSQL, Angular, Kendo, GitHub, Copilot, Docker, Kubernetes, .NET, ASP.NET, Microservices 🏢 Description: For our client we are looking for an experienced Senior Python Engineer to join a modern technology initiative delivered for one of the Big Four firms - the world's largest professional services network, headquartered in London and operating across more than 150 countries. The team behind this project is responsible for designing, building, and deploying enterprise-grade tools and AI-powered solutions that support tax service delivery. It is a cross-functional environment bringing together experts in software engineering, tax, project management, and change management. The scope of work includes solution design, implementation, rollout, training support, and broader stakeholder collaboration. Tech stack Azure Cloud, Microservices Architecture, .NET 8, ASP.NET Core services, Python, MongoDB, Azure SQL, Angular 18, Kendo, GitHub Enterprise with Copilot, LangGraph, LangChain, RAG Pipelines, Multi-modal LLMs Responsibilities Analyse business and technical requirements, contribute to system design, and support end-to-end Python and AI solution development Build, enhance, and maintain scalable Python applications using FastAPI and Pydantic Develop asynchronous and parallel processing solutions with asyncio Perform detailed code reviews to ensure consistency with engineering standards and maintain high code quality Integrate and test multi-modal GenAI capabilities, including areas such as text-to-image and text-to-audio Work effectively both independently and as part of a collaborative team Support day-to-day team coordination by giving clear guidance and helping organize ongoing work Stay in regular contact with the client and support smooth communication Provide technical leadership within the team by mentoring others, coaching colleagues, and setting a strong example Requirements 5+ years of commercial experience in software development Strong hands-on experience with Python and FastAPI Good practical knowledge of Pydantic for schema modelling and data validation Experience with asyncio and asynchronous / parallel programming Practical experience with Generative AI and Large Language Models, including building agentic AI solutions for real business use cases Good understanding of RAG pipelines and hybrid search with vector databases Strong analytical thinking and problem-solving skills, with close attention to detail Pragmatic mindset and the ability to balance process, structure, and flexibility in delivery Very good organizational skills, including self-management, prioritization, and effective work under deadlines Strong troubleshooting and communication skills English level: Intermediate+ Nice to have Experience with Azure Cloud services or other major cloud platforms, including SaaS tools such as Service Bus, Data Lake, Blob Storage, Redis, and similar solutions Familiarity with agentic protocols such as MCP and A2A Hands-on experience with the LangGraph ecosystem, especially long-term memory, state management, and human-in-the-loop workflows Familiarity with .NET Experience with Docker and Kubernetes Solid understanding of microservices architecture and scalable distributed systems Offer rate: 140 - 160 pln B2B remote

🏢 Summary: The offer is for a Staff Python Engineer to lead and evolve a complex, real-time distributed backend system built in Python and Rust for an AI product. The role involves owning core infrastructure components, delivering large initiatives end-to-end, and resolving complex production issues in cloud-based environments. It requires strong expertise in high-performance systems, networking, and reliability at scale. 🗂️ Requirements: 10+ years of Python development experience at Staff/Principal level, Strong experience with Python Asyncio, Strong software design skills, Experience with at least one strongly typed language (Rust, C++, Go, Swift, or Java), Deep understanding of networking protocols, Deep understanding of operating systems, Experience with Python profiling, Experience delivering and troubleshooting production-grade cloud-based distributed systems, Experience with real-time low-level systems (kernel, drivers, RTOS), Experience with Kubernetes and Helm, Experience with observability stacks, Experience with gRPC and troubleshooting, Experience contributing to open-source projects, BSc in Software Development or equivalent experience 📃 Skills: Python, Asyncio, Rust, C++, Go, Swift, Java, Networking, Linux, Profiling, Kubernetes, Helm, gRPC, LLM, RTOS, Kernel, Drivers, Cloud, DistributedSystems, Observability 🏢 Description: For our international client - AI product company - we are looking for an experienced Staff Python Engineer. RESPONSIBILITIES Own parts of our core backend infrastructure, which is a complex, real-time distributed system written in Python and Rust. Own big initiatives end-to-end and deliver them with minimal guidance. Troubleshoot highly complex production issues. Constantly improve our development velocity while maintaining a very high reliability standard. REQUIREMENTS 10+ years of experience in Python development as a Staff/Principal Engineer. Strong Python Asyncio experience. Strong software design skills. Significant experience with at least one strongly typed language (Rust, C++, Go, Swift, Java, etc). Deep understanding of Networking Protocols, Operating Systems. Deep knowledge of Python Profiling. Experience in delivering and troubleshooting a production-grade cloud-based distributed system and a real-time low-level system (e.g. kernel, drivers, RTOS). Experience with Kubernetes, Helm and different observability stacks. Strong LLM prompting skills, but also being able to work without them. Experience with gRPC and its troubleshooting. Being a contributor or maintainer of an open-source package. Excellent communication skills, both verbal and written. BSc in Software Development or equivalent industry experience. NICE TO HAVE An understanding of one of the following: WebRTC, STUN/TURN, SIP, RTP, HLS, RTMP. Having worked with Rust and PyO3. Audio programming experien. WHAT DO WE OFFER ON THIS PROJECT? Cooperation based on a B2B contract and rate paid in USD. 100% remote work. The support of a dedicated mentor. In the relationship, we focus on direct communication. When you join speedapp, you will be put in touch with a dedicated mentor who will make sure that you enjoy working with us and with the client. Events and integration meetings, as well as participation in various initiatives, e.g., sports. Access to the benefits offering (medical care, life insurance, Multisport card). WHAT DOES THE RECRUITMENT PROCESS LOOK LIKE? Application: Apply and submit your CV. After the application review, the recruiter will contact selected candidates by phone. Screening: Have a conversation with a speedapp recruiter about your experience. Next steps: The speedapp recruiter will explain the recruitment process for the specific position. The speedapp recruiter will stay in touch with you throughout the entire process. ABOUT SPEEDAPP At speedapp, we believe that an organization is only as good as the people who make it up. We are a team of IT experts and other professionals working for our clients around the world (including Israel, Austria, USA). We go far beyond the HR category. We build IT teams and also help manage them. 👉 10 years of experience 👉 +100 clients worldwide 👉 +300 hires per year 💎 We have won the prestigious "Forbes Diamonds" award four times (2022, 2023, 2024, 2025). We are a member of the European Fast Growth Icons network and FinTech Poland. We are ranked 18th among the 100 fastest growing companies 2023 by Clutch. DO YOU HAVE ANY QUESTIONS? Contact the recruiter responsible for this process directly. Anna Więckowska Junior IT Delivery Consultant anna.wieckowska@speedapp.pl

🏢 Summary: Senior Python Developer role focused on building and scaling the back-end of an AI-driven quantitative investment platform using FastAPI and AWS. The position involves developing secure, high-performance RESTful services and contributing to a full-stack AI-native feature team. The goal is to deliver a robust, scalable system supporting intelligent and transparent investment solutions. 🗂️ Requirements: Bachelor’s degree in Computer Science, Engineering or related field or equivalent experience, 3+ years of back-end development experience, Proven experience with Python, Commercial experience with FastAPI, Experience building RESTful APIs, Strong knowledge of server-side architecture, Experience with database management, Hands-on experience with AWS, Knowledge of security and data protection practices, Experience with Git 📃 Skills: Python, FastAPI, AWS, REST, API, Git, SQL, GenAI 🏢 Description: We are looking for a dynamic, hands-on Senior Python Developer to join a full-stack AI native feature team for building a cutting-edge quantitative investment platform. The project aims to deliver a groundbreaking, AI-driven investment ecosystem that revolutionizes the entire investment process through an intuitive and human-centric design approach. This initiative transcends mere digitization, aiming to redefine investment decision-making with systematic, transparent and intelligent solutions. The platform is designed with the versatility to cater to a wide array of users and offers transformative capabilities for the investment landscape. Responsibilities Design, develop, and maintain robust and scalable back-end systems using FastAPI and Python Implement security and data protection measures to ensure the integrity and confidentiality of data Optimize applications for maximum speed and scalability Develop and maintain RESTful APIs for seamless communication between different components of the application Conduct code reviews and provide mentorship to ensure code quality and adherence to best practices Troubleshoot and resolve complex technical issues and bugs in a timely manner Stay up-to-date with the latest industry trends and technologies to continuously improve development processes and system performance Requirements Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience 3+ years of proven experience as a Back-End Developer with a focus on FastAPI and Python Strong understanding of server-side logic and database management Expertise in Amazon Web Services Knowledge of FastAPI and REST API Background in Gen AI Assisted Development Familiarity with version control systems such as Git Excellent problem-solving skills and attention to detail Strong communication and collaboration skills Ability to work independently and as part of a team in a fast-paced environment B1+ English level proficiency Nice to have Skills in Cursor Proficiency in ReactJS We offer/Benefits We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

🏢 Summary: Senior Backend Engineer (Python) responsible for designing, building, and maintaining scalable backend services in production environments. The role covers end-to-end ownership from architecture design to production deployment, with strong focus on asynchronous programming and distributed systems. The position is fully remote under a B2B contract. 🗂️ Requirements: Minimum 7 years of experience with Python, Minimum 3 years of experience with Python 3.10+, Experience with asyncio and asynchronous programming, Experience building backend services in production environments, Experience designing and implementing REST APIs, Experience designing scalable distributed systems, Experience with event-driven architecture or queue-based systems, Experience designing fault-tolerant and resilient systems, Experience maintaining production systems, Production experience with NoSQL databases, Experience with data modeling, schema management, and migrations, Experience optimizing database queries and structures, End-to-end ownership from requirements analysis to production deployment, Ability to make technical decisions and manage risks, Very good English communication skills 📃 Skills: Python, Asyncio, REST, NoSQL, MongoDB, Microservices, DistributedSystems, EventDriven, Queues, Kubernetes, CI/CD, OpenTelemetry, Monitoring, SLO, AI, LLM, APIs 🏢 Description: Dla naszego klienta poszukujemy Senior Backend Engineer'a – Python! ZADANIA Senior Python Backend Engineer będzie współpracować z wewnętrznym zespołem developerskim oraz liderami technicznymi. Rola obejmuje pełną odpowiedzialność za budowanie i rozwój rozwiązań oraz wdrażanie ich do środowisk produkcyjnych. WYMAGANIA Min. 7 lat doświadczenia w pracy z Python - co najmniej 3 lata doświadczenia z wersjami 3.10 i nowszymi Asyncio, współbieżność, programowanie asynchroniczne Doświadczenie w budowie usług backendowych działających w środowisku produkcyjnym Projektowanie i implementacja REST API Projektowanie skalowalnych systemów rozproszonych Doświadczenie z architekturą zdarzeniową lub systemami opartymi o kolejki zadań Projektowanie systemów odpornych na błędy i przeciążenia Doświadczenie w utrzymaniu systemów produkcyjnych Doświadczenie produkcyjne z bazami danych (NoSQL, preferowane MongoDB) Modelowanie danych, zarządzanie schemą, migracje Optymalizacja zapytań i struktury bazy Odpowiedzialność end-to-end za dostarczane rozwiązania, od analizy i weryfikacji dostarczonych wymagań, zaprojektowanie architektury, po wdrożenie produkcyjne Umiejętność podejmowania decyzji technicznych, analizy i adresowania ryzyk Dobra/bardzo dobra komunikacja w języku angielskim MILE WIDZIANE Chmura i konteneryzacja Kubernetes i wdrożenia kontenerowe CI/CD i automatyzacja procesów wdrożeniowych Obserwowalność systemów Systemy śledzenia rozproszonego (np. OpenTelemetry) Monitorowanie oparte na metrykach i SLO Integracje AI / LLM Integracja z API modeli językowych Projektowanie pipeline’ów oceny i scoringu Zarządzanie limitami i kosztami zapytań do modeli CO OFERUJEMY NA TYM PROJEKCIE? Współpracę w oparciu o umowę B2B i stawkę: 145-165 zł/h Pracę 100% zdalną Wsparcie dedykowanego opiekuna. Po dołączeniu do speedapp, otrzymasz kontakt do dedykowanego opiekuna, który zadba, aby współpraca z nami oraz z klientem sprawiała Ci satysfakcję Wydarzenia oraz spotkania integracyjne, a także udział w różnych inicjatywach np. sportowych Dostęp do oferty benefitów (opieka medyczna, ubezpieczenie na życie, karta Multisport). JAK WYGLĄDA REKRUTACJA? Zgłoszenie : Zaaplikuj i prześlij swoje CV. Po weryfikacji aplikacji rekruter skontaktuje się telefonicznie z wybranymi kandydatami. Screening : Porozmawiaj z rekruterem speedapp o Twoim doświadczeniu . Kolejne etapy: Rekruter speedapp przedstawi Ci jak wygląda proces rekrutacji na dane stanowisko. Rekruter speedapp pozostanie z Tobą w kontakcie podczas całego procesu. O SPEEDAPP W speedapp wierzymy, że organizacja jest tak dobra jak tworzący ją ludzie. Jesteśmy zespołem ekspertów IT i innych specjalistów pracujących dla naszych klientów na całym świecie (m.in Izrael, Austria, USA). Wykraczamy daleko poza kategorię HR. Budujemy zespoły IT, a także pomagamy w ich zarządzaniu. 👉 10 lat doświadczenia 👉 +100 klientów na całym świecie +300 zatrudnień rocznie 💎 Jesteśmy laureatem prestiżowej nagrody Diamenty Forbes cztery lata z rzędu (2022, 2023, 2024, 2025), członkiem sieci Fast Growth Icons oraz FinTech Poland. MASZ PYTANIA? Skontaktuj się bezpośrednio z rekruterem odpowiedzialnym za ten proces. Karolina Kizowska Senior IT Delivery Consultant karolina.kizowska@speedapp.pl +48 608 487 448

🏢 Summary: Senior Full Stack Developer role focused primarily on backend development with Python and FAST API, combined with React-based frontend work in a hybrid B2B model. The position involves designing scalable web applications, building high-performance APIs, and working with relational and NoSQL databases. Strong backend expertise is essential, with intermediate frontend skills and experience in modern DevOps practices. 🗂️ Requirements: 8+ years of professional software development experience, Expert proficiency in Python, Strong experience with FAST API, Strong knowledge of relational and NoSQL databases, Experience with SQLAlchemy ORM, Deep understanding of data structures and algorithms, Experience building RESTful APIs and microservices, Proficiency in writing unit and integration tests in Python, Strong knowledge of ReactJS and NodeJS, Experience with Redux or MobX, Familiarity with React Query, Experience with Material UI, CSS, and HTML, Experience with Jest and Cypress, Solid understanding of JavaScript and TypeScript 📃 Skills: Python, FASTAPI, SQLAlchemy, PostgreSQL, MySQL, MongoDB, DynamoDB, ReactJS, NodeJS, Redux, MobX, ReactQuery, MaterialUI, CSS, HTML, Jest, Cypress, JavaScript, TypeScript, Docker, Kubernetes, AWS, Azure, GCP, RabbitMQ, Kafka 🏢 Description: Working mode: Hybrid mode ( 2-3 days in a week from the office in Wroclaw or Warsaw) Experience Level: 8+ Years Contract Type: B2B About the Role We are looking for a highly skilled Senior Full Stack Developer with a primary focus on Python and FAST API to join the development team. The ideal candidate is a Python expert capable of architecting robust backend services. While React skills are required, we are flexible regarding the depth of frontend expertise (Intermediate level is acceptable), provided the backend strength is exceptional. Key Responsibilities Backend Architecture: Design, develop, and maintain scalable web applications using Python and FAST API . API Development: Build high-performance RESTful APIs and microservices, ensuring low latency and high availability. Database Management: Work with relational and NoSQL databases, utilizing ORMs like SQLAlchemy to design efficient database schemas and queries. Frontend Development: Develop and maintain user-facing features using ReactJS , ensuring the technical feasibility of UI/UX designs. Code Quality: Write clean, maintainable, and testable code; perform unit testing to ensure robustness. DevOps: Implement and manage CI/CD pipelines to streamline deployment processes. Collaboration: Work closely with cross-functional teams (Product, QA, and Design) in a hybrid working environment. Mandatory Technical Skills 1. Backend (Core Strength): Languages: Expert proficiency in Python . Frameworks: Strong experience with FAST API (Must-have). Experience with SQLAlchemy is highly preferred. Fundamentals: Deep understanding of data structures, algorithms, and space-time complexity. Database: Strong understanding of Relational (e.g., PostgreSQL, MySQL) and NoSQL (e.g., MongoDB, DynamoDB) databases. Testing: Proficiency in writing unit tests and integration tests for Python applications. 2. Frontend (Intermediate Level): Libraries: Strong knowledge of ReactJS and NodeJS . State Management: Experience with React workflows such as Redux or MobX . Tooling: Familiarity with React Query . Styling: Experience with Material UI , CSS , and HTML . Testing: Experience with frontend testing tools like Jest and Cypress . JavaScript: Solid understanding of JavaScript , TypeScript , and browser rendering behavior. Good to Have Experience with cloud platforms (AWS, Azure, or GCP). Knowledge of containerization (Docker, Kubernetes). Understanding of microservices architecture and message queues (RabbitMQ, Kafka).