Senior Python Systems Developer - Functional Testing Expert

Please submit your CV in English and specify your English proficiency level. This is a freelance, project-based position with Toloka AI, connecting through the Mindrift platform. Assignments focus on testing, evaluating, and improving AI systems for technology companies. This role is not a permanent employment contract. Role overview The Senior Python System…

Note: This is a freelance, project-based position via Mindrift (powered by Toloka AI), not a permanent role. Candidates must submit a CV in English and indicate their English proficiency level. Mindrift connects skilled professionals to project-based work in AI, supporting leading technology companies. Projects focus on testing, evaluating, and improving AI systems. Role overview Toloka AI is seeking a Senior Python Developer with expertise in code migration and functional testing. This remote position is open to candidates based in Sweden. The work involves handling large codebases across multiple programming languages, managing Docker environments, and using large language models (LLMs) to automate and streamline development tasks. What you will do Develop functional black box tests for codebases written in various languages Set up and maintain Docker environments to support consistent builds and test execution Track code coverage and implement automated scoring to align with industry standards Apply LLMs (such as Roo Code and Claude Code) to automate repetitive tasks, enhance code quality, and accelerate development cycles Requirements 5+ years of software engineering experience, with a strong focus on Python Advanced knowledge of pytest, including fixtures, session-scoped tests, and timeouts; experience designing black-box functional tests for CLI tools Expertise in Docker: writing reproducible Dockerfiles, managing user contexts, and maintaining secure workspaces Proficiency in Linux and Bash scripting, with the ability to debug within containers Familiarity with modern Python tools (uv, pyproject.toml, packaging) Ability to read and understand code in C, C++, Rust, and Go, with support from LLMs Experience using LLMs (Claude Code, Roo Code, Cursor) to speed up development and generate test cases English proficiency at B2 level or above Preferred qualifications Background with agent evaluation platforms Familiarity with MCP CLI Technologies used Python (pytest, uv, Pillow), Docker, Bash, Git Submodules, C/C++/Rust/Go (for reading code), Dagger, GitHub Codespaces, LLMs (Claude Code, Roo Code, Cursor), coverage.py, gcov, kcov. Benefits Project-based freelance work through Mindrift Fully remote and flexible: set your own hours (20-30 per week) Compensation varies by project and expertise; AI trainers can earn up to $50 per hour

Join Our Innovative Team!At Magnet Forensics, we are at the forefront of digital investigative technology, committed to empowering users through our cutting-edge software solutions. Our products are designed to acquire, analyze, and share vital evidence from a variety of devices, including computers, smartphones, tablets, and IoT devices. Our mission is to provide advanced tools that help protect businesses, communities, and nations by enhancing digital investigations. With a global clientele, our solutions are pivotal in modernizing how investigations are conducted, assisting law enforcement and security personnel in combating crime and safeguarding assets. As we continue to expand our international footprint, we are looking for talented individuals who are passionate about making a difference. Become a part of our dynamic and supportive environment where you can grow and thrive alongside a team of exceptional professionals. If you believe you align with our vision and are eager to contribute, we want to hear from you!Position OverviewAs a Senior Software Development Engineer in Test, you will take the lead in automating the testing processes for both our new and existing products. This role is instrumental in mentoring fellow team members, offering technical insight, and spearheading the development of internal engineering tools and quality frameworks. Collaborating closely with our development teams, you will ensure robust, reliable, and thorough testing practices by utilizing state-of-the-art technologies and industry best practices.

jobgether is hiring a Senior Full-Stack Engineer based in Sweden. This position focuses on building and improving software using Python and React. The role centers on developing solutions that enhance how users interact with our products. What you will do Work on both backend and frontend projects using Python and React Collaborate with engineers and colleagues from other teams to deliver software Tackle complex technical challenges and contribute to key projects Requirements Professional experience with Python and React Ability to solve complex problems and deliver high-quality solutions Comfort working with cross-functional teams

Sopra Steria is hiring a Java System Developer for the Östersund office. This position centers on building and maintaining software applications as part of a collaborative team. Role overview This role involves working on a range of software projects using Java. The team values new ideas and a strong interest in technology. Expect to contribute to the development of reliable and effective solutions for clients. What you will do Develop and maintain Java-based software applications Work closely with colleagues to solve technical challenges Participate in projects that require creative and analytical thinking Requirements Experience with Java development Interest in technology and software solutions Ability to work well in a team setting

Sopra Steria is looking for a Senior .NET System Developer to join the team in Stockholm. This position focuses on leading projects that use .NET technologies to build scalable software applications. Role overview As a senior developer, you will design and develop solutions that support both internal teams and client needs. Collaboration with colleagues from different disciplines is central to the role. Your technical decisions will help shape project outcomes and improve the quality of our software. What you will do Lead the development of applications using .NET technologies Work closely with cross-functional teams to deliver software solutions Contribute to the design and architecture of scalable systems Requirements Extensive experience with .NET development Strong background in designing and building scalable applications Comfort working in a collaborative, team-oriented setting

Are you a driven and solutions-focused NetSuite expert with extensive functional expertise in financial processes? Do you thrive on connecting Finance with IT and enjoy leading and mentoring teams?Join our Emerging ERP Solutions - Team NetSuite, where we empower clients to leverage their NetSuite solutions through in-depth advisory, implementation, and operational services. Collaborating closely with our clients, we help them realize their vision and develop sustainable capabilities by merging profound process knowledge with technical excellence.This position allows you to create a lasting impact for our clients while gaining exposure to some of the most intriguing and complex transformation initiatives in the Nordic region. Coupled with our structured coaching and mentoring framework, we encourage you to shape and lead your own professional development, fostering both personal and career growth.Your Role and ResponsibilitiesAs a Functional NetSuite Consultant, you will spearhead and contribute to dynamic advisory, implementation, and operational projects across the entire finance process spectrum. You will utilize your thorough understanding of NetSuite and enterprise finance processes to support, advise, and mentor clients and junior team members on their NetSuite journey. Your responsibilities will include:Process Design & Advisory: Leading clients through structured decision-making processes to design and refine their Record-to-Report (R2R), Procure-to-Pay (P2P), and Order-to-Cash (O2C) processes within NetSuite, ensuring alignment with their business strategy and transformation goals.Implementation Leadership: Managing or substantially contributing to all stages of NetSuite implementations, including discovery, requirement gathering, functional design and configuration, testing, training, and go-live support.Data Migration Expertise: Crafting and supervising data migration strategies and execution, guaranteeing data integrity, completeness, and compliance throughout the migration lifecycle.Project Management: Employing robust project management practices to deliver outcomes, overseeing timelines, scope, resources, and stakeholder expectations. Mentoring junior team members on best practices for project execution.Stakeholder Management: Engaging effectively with a diverse range of stakeholders—from C-level finance executives to operational teams—to gather requirements, manage expectations, and enhance the adoption of new processes and systems.Change Management: Assisting clients in navigating organizational change by developing training materials and ensuring a seamless transition to new NetSuite-enabled processes.Continuous Improvement: Evaluating clients’ existing NetSuite implementations, identifying areas for optimization, and recommending enhancements to improve efficiency and effectiveness.

As a System Developer, you will be a part of our division that provides services and consultancy in digitalization, artificial intelligence, design, and more. Through digitalization, we assist our clients in accelerating their transition towards a more sustainable society.Do you wish to collaborate with other talented colleagues who share your technical enthusiasm? At AFRY, you will have the opportunity to work at a company that prioritizes its employees and consistently strives to be at the forefront of technological innovation with a focus on sustainability.We offer extensive opportunities for those who have experience in system development and thrive in the dynamic role of a consultant. The project that suits you best will be determined based on your specific skills and knowledge.

Join our dynamic team at Sopra Steria as a System Developer specializing in .Net technologies in Östersund. We are looking for innovative thinkers who are passionate about creating software solutions that make a difference. You will collaborate closely with cross-functional teams to develop, maintain, and enhance applications that drive our business objectives.

Join Us as a Senior Financial Systems Engineer!At Lovable, we’re on the lookout for a skilled engineer to lead the development and management of our financial systems infrastructure. This infrastructure is vital as it supports our payment flows, usage metering, monetization, and billing processes.Why Choose Lovable?Lovable empowers individuals and teams of all sizes to create software using any programming language. From aspiring entrepreneurs to major corporations, millions leverage Lovable to turn innovative ideas into successful products swiftly. We’re pioneering a transformative era in software development, providing you with an extraordinary chance to influence the digital landscape. With over 2 million users across more than 200 countries, Lovable is making waves in business automation and idea realization, and this is just the beginning.Our compact, highly talented team is dedicated to forging a company that defines a generation from our base in Stockholm. We emphasize extreme ownership, rapid execution, and collaborative humility, seeking individuals who are passionate, fast-paced, and eager to make a significant impact.Why This Role is Crucial?As we expand our global reach, it’s essential that our financial systems evolve in tandem. We are establishing a dedicated Financial Systems Engineering team to manage everything that links product usage to revenue, including subscription billing, credit-based usage models, service billing, and new monetization infrastructures as we grow.This senior position offers substantial influence. You won’t just maintain existing systems; you’ll be re-engineering and re-architecting while we still have the agility to do it right, shaping the architecture that will support our journey through scaling for years ahead.

Are you a driven and solution-focused NetSuite professional with extensive expertise in financial processes? Do you have a knack for connecting Finance with IT and thrive in leading and mentoring teams?Join our Emerging ERP Solutions - Team NetSuite, dedicated to helping clients unlock the full potential of their NetSuite systems through comprehensive advisory, implementation, and operational services. We collaborate closely with our clients to realize their vision and establish sustainable capabilities by merging deep process knowledge with technical proficiency.This role presents a chance to make a substantial impact for our clients while engaging with some of the Nordic region's most intriguing and complex transformation projects. Coupled with our structured coaching and mentoring framework, you will be encouraged to shape and steer your personal and professional growth.Your Role and ResponsibilitiesAs a Functional NetSuite Consultant, you will spearhead and contribute to dynamic advisory, implementation, and operational projects across the entire finance process spectrum. You will leverage your extensive knowledge of NetSuite and enterprise finance processes to support, advise, and mentor clients and junior team members along their NetSuite journey. Your responsibilities will encompass:Process Design & Advisory: Leading clients through structured decision-making to design and enhance their Record-to-Report (R2R), Procure-to-Pay (P2P), and Order-to-Cash (O2C) processes within NetSuite, aligned with their business strategies and transformation goals.Implementation Leadership: Overseeing or significantly contributing to all stages of NetSuite implementations—including requirement gathering, functional design, configuration, testing, training, and go-live support.Data Migration Expertise: Crafting and managing data migration strategies and execution, ensuring data integrity and compliance throughout the migration process.Project Management: Applying robust project management principles to deliverables, managing timelines, scope, resources, and stakeholder expectations while mentoring junior team members in project execution best practices.Stakeholder Management: Communicating effectively with a diverse range of stakeholders—from executive finance leaders to operational teams—to gather requirements, manage expectations, and promote the adoption of new processes and systems.Change Management: Assisting clients in navigating organizational change, creating training materials, and ensuring a seamless transition to new NetSuite-enabled processes.Continuous Improvement: Fostering a culture of continuous improvement by identifying opportunities for enhancing processes and systems.

About UsAt Xenon7, we are where elite tech talent meets exceptional opportunities! We collaborate with leading enterprises and innovative startups to tackle exciting, cutting-edge projects using the latest technologies across various IT domains, including Data, Web, Infrastructure, AI, and more. Our expertise in IT solutions development and on-demand resources empowers us to partner with clients on transformative initiatives, driving innovation and significant business growth. Whether empowering global organizations or collaborating with pioneering startups, we are dedicated to delivering advanced and impactful solutions that address today's most complex challenges.Join us in building a community of top-tier experts! We are currently inviting exceptional AI & ML Professionals to solve real-world problems and help shape the future of intelligent systems.About the RoleWe are searching for a talented Node.js + Python Engineer with extensive experience in building backend services, APIs, automation, and data-driven features. You will collaborate with a distributed engineering team on a modern platform utilizing Node.js, Python, PostgreSQL, and cloud-native tools.Key ResponsibilitiesDevelop and maintain backend services using Node.js and Python.Design and optimize REST APIs, microservices, and backend workflows.Utilize PostgreSQL for schema design, queries, and performance tuning.Create automation scripts, integrations, and backend utilities.Collaborate with product, DevOps, and frontend teams to deliver features end-to-end.Produce clean, testable, and maintainable code following industry best practices.Diagnose production issues and enhance system reliability.Engage in code reviews, architecture discussions, and technical planning.Required Skills3–7+ years of backend engineering experienceProficient in Node.js (using frameworks like Express, Fastify, NestJS, etc.)Strong background in Python (including automation, APIs, scripts, services)Proven SQL skills and experience with PostgreSQL.Experience in microservices, API design, and distributed systems.Familiarity with Docker, CI/CD pipelines, and cloud environments (AWS/Azure/GCP).Solid understanding of authentication, authorization, and security best practices.Excellent debugging, problem-solving, and communication skills.Nice to HaveExperience with message queues (SQS, RabbitMQ, Kafka).Knowledge of Redis or caching strategies.Familiarity with serverless architectures (AWS Lambda).Experience with monitoring tools (CloudWatch, Prometheus).

We invite you to submit your CV in English, clearly indicating your level of English proficiency.Mindrift specializes in connecting skilled professionals with project-based AI opportunities for prominent tech companies. Our focus is on the testing, evaluation, and enhancement of AI systems. Please note that this is a project-based role, not a permanent position.About the RoleEach project offers unique challenges, and contributors may be involved in:Creating innovative computational engineering tasks that mirror real-world engineering processes;Developing problems that necessitate Python programming for solving engineering calculations and simulations;Ensuring tasks are computationally demanding, utilizing numerical methods or iterative solutions;Designing problems related to system optimization, design, and analysis;Formulating challenges based on genuine research problems or practical engineering applications;Validating solutions using Python with established engineering libraries;Clearly documenting problem statements and providing verified correct solutions.Candidate ProfileThis opportunity suits engineers experienced in Python, looking for part-time, project-based engagements. Ideal candidates will possess:A degree in Electrical Engineering or a related discipline;Proficiency in Python for numerical validation; familiarity with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or any equivalent programming language is acceptable;A minimum of 2 years of relevant professional experience, whether in applied work, research, or teaching;A solid understanding of practical engineering constraints and approximations;Exceptional written English skills (C1+);Professional certifications (e.g., CMME, SAS Certifications, CAP) and experience in international or applied projects are advantageous.How to Get InvolvedApplication → Qualification Process → Project Engagement → Task Completion → CompensationProject CommitmentTasks are anticipated to require approximately 10–20 hours per week during active project phases, depending on specific project needs. This is an estimate and not a guaranteed workload.Compensation DetailsParticipants can earn up to $50 per hour, contingent on their expertise and contribution pace. Compensation rates may vary across projects based on scope, complexity, and required skills. Please be aware that other projects on our platform may offer different compensation structures.

Mindrift offers project-based remote roles for specialists in chemistry and Python, supporting the development and evaluation of AI systems for technology companies. This freelance position is open to candidates based in Sweden and is not a permanent employment opportunity. Role overview As a Freelance AI Trainer, the main focus is to create and validate computational chemistry problems that mirror real-world research workflows. Tasks include designing original scenarios that require advanced reasoning in physical chemistry, quantum chemistry, and molecular modeling. Problems should demand Python programming for resolution, often using libraries such as numpy, scipy, or other relevant chemical packages. Each problem must be computationally intensive, with solutions that cannot be completed manually in a reasonable timeframe. All problem statements and answers should be clearly documented and verified using established computational chemistry methods in Python. Requirements Degree in Chemistry or a related field Proficiency in Python for numerical validation (experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or domain-specific libraries is also acceptable) At least 2 years of professional experience in applied, research, or teaching roles Experience with numerical methods in chemistry Strong understanding of computational chemistry concepts and techniques Excellent written English skills at C1+ level Project commitment During active project phases, expect to contribute approximately 10–20 hours per week. Actual workload may vary depending on project needs. Compensation Contributors can earn up to $45 per hour, depending on expertise and the pace of contributions. Compensation may differ between projects based on complexity, scope, and required skills. How to apply Please submit your CV in English and include your English proficiency level. The process involves applying, passing qualifications, joining a project, completing assigned tasks, and receiving compensation.

Please submit your CV in English and indicate your level of English proficiency.Mindrift connects talented specialists with exciting project-based AI opportunities for leading technology companies, focusing on the testing, evaluation, and enhancement of AI systems. Note that participation is project-based and does not entail permanent employment.What This Opportunity Involves:While each project presents its own unique challenges, contributors may:Design innovative computational statistics problems that reflect authentic mathematical research workflows;Create Python-based problems requiring solutions utilizing libraries such as Numpy, SciPy, and Sympy;Ensure problems are computationally intensive, taking days or weeks to solve manually;Develop scenarios necessitating complex reasoning in fields like number theory, combinatorics, graph theory, and numerical analysis;Base problems on genuine research challenges or practical applications in mathematics;Validate solutions using Python and standard mathematical libraries;Clearly document problem statements and provide verified correct answers.What We Look For:This opportunity is ideal for statistics specialists with Python experience who are open to part-time, non-permanent projects. Ideally, candidates will possess:A degree in Statistics or related disciplines;Proficiency in Python for numerical validation. Experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or any programming language can be considered equivalent;At least 2 years of professional experience in applied, research, or teaching roles;Strong command of written English (C1+ level);Professional certifications (e.g., CMME, SAS Certifications, CAP) and experience in international or applied projects are advantageous.How It Works:Apply → Pass qualification(s) → Join a project → Complete tasks → Get compensatedProject Time Expectations:During active phases, tasks are estimated to require about 10–20 hours per week, depending on project requirements. This is an estimate and not a guaranteed workload.Compensation:Contributors can earn up to $50 per hour equivalent, depending on their expertise and contribution pace. Compensation varies by project based on scope, complexity, and required expertise, and different projects may offer varying earning levels.

Toloka AI seeks a freelance AI trainer who combines civil engineering experience with strong Python programming skills. This contract position is fully remote and open to candidates based in Sweden. Role overview This role centers on applying civil engineering knowledge and Python expertise to help train and refine artificial intelligence systems. The work supports the development of AI applications by contributing specialized insights from both fields. What you will do Apply civil engineering concepts and Python programming to improve AI models Offer subject matter expertise to shape and support AI application development Location This is a remote position for candidates located in Sweden.

We invite you to submit your CV in English and specify your level of English proficiency.At Mindrift, we bridge the gap between specialized talent and exciting, project-based AI roles with leading technology firms. Our focus is on testing, evaluating, and enhancing AI systems. Note: Participation is on a project basis, not permanent employment.What You Will DoEach project presents unique challenges, and contributors may:Design innovative computational physics problems that replicate actual research workflows;Create programming challenges that necessitate Python solutions (utilizing libraries such as Numpy, SciPy, and Sympy);Ensure tasks are computationally demanding and cannot be resolved manually within a reasonable timeframe;Develop problems that require sophisticated reasoning in mechanics, electromagnetism, thermodynamics, and quantum mechanics;Base problem sets on genuine research obstacles or real-world applications from the field of physics;Verify solutions using Python and standard physics simulation libraries;Clearly document problem statements and provide validated answers.What We Are Looking ForThis role is ideal for physicists with Python experience who are interested in part-time, non-permanent engagements. Ideal candidates will possess:A degree in Physics (Theoretical, Experimental, or Computational) or a related discipline;Proficiency in Python for numerical validation, with familiarity in MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or Stata being advantageous;A minimum of 2 years of professional experience in applied research or teaching;Experience with numerical simulation techniques;The capability to create problems that reflect real-world physics research workflows;Creative approaches to problem design across various physics domains;A solid understanding of physics modeling and approximation methods;Strong written English skills (C1+).Process OverviewApplication → Qualification Assessment → Project Assignment → Task Completion → PaymentProject Time CommitmentFor this project, expect to dedicate approximately 10–20 hours per week during active phases, based on specific project needs. This is an estimate and not a guaranteed workload for the duration of the project.Compensation DetailsContributors can earn up to $45 per hour, contingent upon their proficiency and contribution pace. Compensation may vary by project based on scope, complexity, and expertise required. Note that other projects may offer differing compensation levels based on their specific needs.

Kindly submit your CV in English, along with a description of your English proficiency level.Mindrift bridges the gap between specialists and project-based AI opportunities offered by leading tech companies, focusing on the testing, evaluation, and enhancement of AI systems. Please note that participation in these projects is temporary and project-based, not permanent employment.What This Opportunity Entails:Contributors will engage in unique tasks for each project, which may include:Designing original computational engineering challenges that replicate real-world engineering workflows;Creating problems that require Python programming to address engineering calculations and simulations;Ensuring tasks are computationally intensive and necessitate numerical methods or iterative solutions;Formulating challenges related to system design, optimization, and analysis;Base challenges on actual research issues or practical applications from engineering practice;Validating solutions using Python and established engineering libraries;Clearly documenting problem statements and providing verified correct answers.Candidate Profile:This role is ideal for engineers with Python experience who are interested in part-time, non-permanent project engagements. The ideal candidate will possess:A degree in Mechanical Engineering or a related field;Proficiency in Python for numerical validation; familiarity with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, domain-specific libraries, Stata, or experience in any programming language will be considered;At least 2 years of professional experience, which can include applied, research, or teaching roles;A strong grasp of practical engineering constraints and approximations;Excellent written English skills (C1 level or higher);Professional certifications (e.g., CMME, SAS Certifications, CAP) and experience in international or applied projects are advantageous.How It Works:Submit an application → Complete qualification assessments → Join a project → Carry out tasks → Receive payment.Project Time Commitment:During active project phases, tasks are estimated to require approximately 10-20 hours per week, based on project demands. This is an estimate and not a guaranteed workload.Compensation:Contributors can earn up to $50 per hour, depending on their skill level and contribution pace. Compensation may vary by project based on its scope, complexity, and required expertise. Please note that other projects on the platform may offer different earning levels based on their unique requirements.

Join our innovative team at Sopra Steria as a System Developer specializing in .NET technologies. In this role, you will collaborate with cross-functional teams to design, develop, and maintain high-quality software solutions that meet our clients' needs.

Sopra Steria is looking for a Java System Developer to join the team in Stockholm. This position centers on building and maintaining Java-based applications that support a range of business needs. Role overview As a Java System Developer, the work involves designing, developing, and maintaining applications. Collaboration with colleagues from different disciplines is a key part of the role, ensuring that software solutions meet high standards of quality and reliability. What you will do Design and implement Java applications Maintain and improve existing systems Work closely with cross-functional teams on project delivery Location This position is based in Stockholm.