Warsaw (fully remote), Poland Lead Python Backend Engineer We’re looking for Python backend engineers interested in team management to work on a trustless supercluster of performance-proofed GPU-enabled sandboxed docker container runners controlled by truly decentralized algorithms (not just PAXOS or RAFT). Wow, that was a mouthful... If you found it interesting, join Reef Technologies and lead a team of senior engineers who tackle complex technical challenges. With us, you’ll work on your own terms: Contribute from wherever you like—we are fully remote Set your own time commitment, as long as it’s at least 30h per week See how we work in our handbook: github.com/reef-technologies/handbook Influence the way we operate through our Sociocracy 3.0 decision-making process Salary on a B2B contract: 75–90 USD or 300–380 PLN per hour, or 12600–15120 USD or 48000–60800 PLN a month if you work 40 hours per week (most of us work a bit less) Flexible work schedule (as measured with a time tracker) We automatically adjust rates based on inflation twice a year So, what do you think? You don't even need a CV, just click here and shoot a few quick commands to apply. We're looking for someone with 2+ years of team management and 5+ years of programming experience (including at least a year with Python, open source and significant personal projects do count).

Warsaw (fully remote), Poland Senior Python Backend Engineer We’re looking for Python backend engineers to work on a trustless supercluster of performance-proofed GPU-enabled sandboxed docker container runners controlled by truly decentralized algorithms (not just PAXOS or RAFT). Wow, that was a mouthful... If you found it interesting, join Reef Technologies and tackle complex technical challenges like this on your own terms: Contribute from wherever you like—we are fully remote Set your own time commitment, as long as it’s at least 30h per week See how we work in our handbook Influence the way we operate through our Sociocracy 3.0 decision-making process Salary on a B2B contract: 45-70 USD or 180-280 PLN per hour Flexible work schedule (as measured with a time tracker) We automatically adjust rates based on inflation twice a year So, what do you think? You don't even need a CV, just click here and shoot a few quick commands to apply. We're looking for someone with 5+ years of programming experience, including at least a year with Python (including opensource and significant personal projects).

REMOTE, REMOTE THIS IS A FULLY REMOTE ROLE - YOU MUST BE LOCATED EITHER IN THE US, CANADA or WESTERN EUROPE We're seeking a versatile DevOps Engineer to help scale our infrastructure and operations. This is a "wear many hats" position perfect for someone who thrives in a fast-paced, distributed environment and enjoys building systems that grow with the business. What You'll Do Design and evolve AWS infrastructure using Python and 3rd party libraries. Build and maintain provisioning systems that scale with our growth. Assist with and eventually lead the provisioning system and software release process. Develop internal tools for employees and partners using our stack (Python, FastAPI, nicegui, PostgreSQL, Vue.js). Manage security policies and respond to customer security questionnaires. Support our remote-first culture through robust, reliable systems. What we are looking for Strong experience with AWS infrastructure and Python automation. Proven ability to work independently in a remote environment. Excellent async communication skills and self-management. Experience building scalable systems from the ground up. Comfortable with security best practices and compliance requirements. Adaptability to wear multiple hats and tackle diverse challenges. We release often, including the weekend. You are available to work then. Our Stack AWS, Python, FastAPI, NiceGUI, PostgreSQL, Vue.js, plus various 3rd party integrations If you are ready to help a growing SaaS company scale please start your cover letter with “ I AM A VERSATILE DEVOPS ENGINEER” We'd love to hear from you. To be considered please fill out the click up form https://forms.clickup.com/2257368/f/24wer-68877/ON1CTQHI8FXGJURL5V

Remote, United Kingdom Key information Salary: £47,922 + profit share per year (full-time equivalent, pro-rated for part-time working) Working pattern: Full-time as 37.5 hours per week or Part-time as 30 hours per week Location: Remote, UK-wide with occasional national travel to meet with colleagues in-person The role As a software developer joining our team you will: Develop and maintain useful and reliable Python-based back-end systems Build and support web-based tools and data infrastructure used in purpose-driven data initiatives Work with complex datasets and shared data standards Build and improve data systems including pipelines, validation processes, quality checks and tools that help people publish, use and maintain data well Work closely with colleagues across engineering, analysis and directly with partners and clients Over the past decade, we’ve helped more than 50 organisations design and build data initiatives that support better decisions. To give you an idea of the kind of projects you’ll get to work on, here are some examples of our impact. We’ve helped: improve how development and humanitarian resources are tracked understand the sustainability of infrastructure projects build standards that climate and disaster risk data easier to find map high-speed internet networks to close connectivity gaps build data infrastructure that makes grantmaking more informed and effective We recognise there are many paths to becoming a software developer. We’re more interested in demonstrable skills and experience than formal qualifications. We often work in specialised areas, and we’ll support you to learn the domain, build new skills, and apply your existing experience in context. Essential Experience of developing maintainable software in Python Experience of back-end web development (most of our projects use a combination of Django, DRF/FastAPI, and PostgreSQL) Experience of HTML, CSS and JS for front-end web development Experience of developing software and systems with a focus on robustness and quality through test-driven development, shift left testing, or other emphasis on automated unit/integration testing, including use of standard tools and frameworks (e.g., pytest, Selenium). Use of Git for version control and collaborative development You understand the value of clear and thoughtful written and spoken communication and have experience offering this to others. You’re interested in working in a flat organisation, where people contribute proactively, share responsibility and work collaboratively towards a shared purpose We don’t expect candidates to match every point listed here. If you meet most of the essential skills and experience, and this role feels like a good fit, we’d encourage you to apply. Desirable Experience developing data pipelines and/or code and systems that manipulate complex data in common data formats, such as JSON, XML and CSV. Experience in UI/UX and accessible front-end web development, or a desire to develop skills in this area. Experience of cloud/remote systems administration Experience of CI/CD and/or software deployment, e.g., Saltstack, OpenTofu Experience communicating with clients and/or other stakeholders Knowledge of the open data movement and community and/or understanding of open source software and content licensing

REMOTE, REMOTE This is a FULLY REMOTE-WORLDWIDE position As a senior software engineer, you'll join a team tackling genuinely hard problems: distributed data processing at enterprise scale, complex deduplication algorithms, and systems that need to handle billions of records without breaking. The kind of challenges that require actual engineering thinking, not just tutorial-level code. Ready to tackle complex engineering challenges that impact how the world's largest companies manage their data? Who we are NOT looking for *Agencies *People who are looking for a side “hustle” or are starting their own business *Anyone with less than 8 years of experience If you are a fit for this position, please start your Cover Letter with I AM A SENIOR BACK END PYTHON ENGINEER WITH 8+ YEARS OF EXPERIENCE in all CAPS To be considered pls fill out this form https://forms.clickup.com/2257368/f/24wer-69717/12MWQYCOXQEFIYE71Y Required Skills: *Very proficient with Linux at the terminal level *Test-driven development (TDD) and pytest proficiency *7+ years Python experience *Polars experience *PostgreSQL expertise: schema design, optimization, advanced queries *Familiarity with, and adherence to, PEP guidelines and Python coding standards *RESTful API development and design best practices *Scalable architecture design for high-volume data environments *Security practices and vulnerability prevention *Bug identification and resolution with local testing *Thoughtful development centered around performance, deeply optimized code, and proper code organization *Git version control with branching strategies *English fluency (written/verbal) *Previous experience working for a US-based company.

Remote (EU), Overijsel, Remote (EU) Position Details Salary: EUR 70k annual base salary, with VSOP available for discussion Working Hours: Daytime working hours aligned with Central European Time (CET) Work Setup: Fully remote position Role Summary We are hiring a Senior Python Developer to lead design and implementation across a stateful, workflow-driven platform built in Python. This role requires strong backend engineering fundamentals and the ability to work confidently across application logic, APIs, integrations, asynchronous processing, state management, testing, and production architecture. You will work on a platform that combines: Python services and core runtime design FastAPI-style HTTP APIs and callback endpoints Redis-backed state and workflow persistence Async external-provider integrations and retry handling Multi-channel messaging backends LLM-assisted workflow components End-to-end testing of orchestration, contracts, and recovery paths This is a senior hands-on engineering role. We expect clear technical judgment, strong ownership, and pragmatic architectural decision-making without unnecessary complexity. Responsibilities Design, implement, and maintain production-grade Python services and runtime components Own complex backend features end to end, from domain modeling through rollout and regression coverage Build and evolve stateful workflow systems, orchestration layers, and asynchronous processing Integrate with third-party APIs and external service providers in a reliable, observable, and fault-tolerant way Improve system correctness around retries, idempotency, error handling, and distributed state transitions Contribute across the stack including APIs, integrations, contracts, and tooling Write high-signal tests covering unit, integration, contract, and recovery scenarios Review code rigorously and raise the bar for design clarity, maintainability, and runtime safety Collaborate with stakeholders to turn ambiguous requirements into robust implementation plans Working Style We value engineers who are: rigorous pragmatic comfortable with ownership concise in communication capable of handling both systems thinking and implementation detail If you are strongest only in isolated backend CRUD development and do not enjoy stateful systems, integrations, or workflow complexity, this role is likely not the right fit. Required Experience 6+ years of professional Python development experience Strong experience with modern Python backend development, including type-aware design and asynchronous programming Strong experience designing and maintaining APIs and service boundaries Solid experience with Redis or comparable key-value/data-structure stores in production systems Experience with event-driven or workflow-oriented systems, including retries, resumability, and state transitions Experience integrating with external services, callbacks/webhooks, and long-running remote processes Strong testing discipline with pytest and a clear understanding of regression prevention Comfortable working in systems that mix deterministic application logic with AI/LLM-assisted components Ability to work across backend, platform, and integration concerns without narrow specialization Preferred Experience Experience with FastAPI, Starlette, or similar Python web frameworks Experience with conversational systems, messaging backends, or multi-channel product flows Experience with queue-like async coordination patterns, webhook security, and idempotent callback handling Experience with localization/i18n pipelines and user-facing workflow systems Experience with Docker-based local development and production deployment workflows Experience working in codebases with strong architectural boundaries, typed domain contracts, and documentation-driven development Technical Profile The right candidate should be comfortable with most of the following: Python Async I/O and coroutine-based service design FastAPI-style API development Redis-backed application state Pytest-based automated testing REST/webhook integrations State machines, orchestration, and workflow engines Payload/schema design and validation Production debugging and operational reasoning Docker-based development environments What Good Looks Like Produces code that is clear, defensible, and easy to evolve Understands failure modes before they happen and designs accordingly Makes deliberate tradeoffs instead of defaulting to abstraction or framework-heavy solutions Can move between architecture, implementation, and debugging without losing precision Writes tests that reflect real system behavior, not just happy-path implementation details Communicates directly and professionally with strong technical judgment Seniority Expectations This role is not limited to ticket execution. We expect the engineer in this position to: identify weak spots in architecture and implementation propose clean solutions with minimal ceremony drive difficult features across multiple modules improve engineering standards through code review and design decisions and take responsibility for correctness in production-facing behavior Nice-to-Have Domain Exposure Messaging platforms such as WhatsApp or web chat systems Identity, onboarding, or verification workflows AI-assisted product experiences Workflow engines and rule-driven application behavior Employment / Tax EU VAT compliance is a must for contractors EU GDPR compliance is a must EU work permit is a strong pre

London, United Kingdom We are inviting applications for a research software engineer to be based in the Neuroinformatics Unit, working with the laboratories of Tom Mrsic-Flogel, Sonja Hofer and Tim Behrens in collaboration with the Advanced Microscopy Facility. Our research seeks to understand how the frontal regions of the brain build circuits for cognition (e.g. planning, reasoning, abstraction). The challenge is to identify the precise neural microcircuits that underpin cognitive computations. To achieve this, we image the activity of neurons in a variety of task using benchtop and miniaturise two-photon microscopes, and then perform targeted holographic stimulation of identified neurons to probe their connectivity. This requires a complex pipeline of imaging, signal processing and alignment of multi-modal data sources. You will be responsible for developing and optimising efficient algorithms to process functional brain imaging data including motion correction, segmentation and multimodal registration. These algorithms will then be integrated within existing software packages for data acquisition, analysis and visualisation. This post is funded until September 2028 in the first instance with the possibility of extension subject to grant funding. Informal enquiries regarding the role can be addressed to Adam Tyson (adam.tyson@ucl.ac.uk). A full job description and person specification for this role can be accessed below. To apply, please upload a current CV, complete the online application form, and use the supporting statement section or upload a cover letter to outline how you meet the essential and desirable criteria for the role. Please do not upload any additional attachments as these will not be considered by the selection panel. You will have strong programming skills in Python along with extensive experience working with numerical data such as images and timeseries. The ideal candidate will have experience in either image registration or working with multiphoton calcium imaging. You should have a strong interest in building easy to use software to help advance neuroscience and be comfortable working in teams of researchers and software engineers. The ideal candidate will have experience of good software engineering best practices and working on, and with open-source software.

London, United Kingdom The SWC is pioneering open-source approaches (such as Aeon) to study behaviour and brain function over long time scales (days to weeks). Processing and analysing this data represents a considerable challenge due to the scale and the complexity of such long-term recordings (e.g. drift of electrophysiological recordings). We are inviting applications for a research software engineer to be based in the Neuroinformatics Unit, working with the laboratories of Tom Mrsic-Flogel, Tiago Branco and Tim Behrens. You will be responsible for developing, optimising, and using efficient tools to process and visualise large volumes of extracellular electrophysiological data (such as from Neuropixels probes) and behavioural data (such as from video recordings). This will include contributing to open-source packages such as "SpikeInterface" and "Movement" and implementing them within SWC pipelines (e.g. using DataJoint). A key part of the role will be to efficiently process large-scale data recorded by researchers at SWC (e.g. from Aeon), and ensuring that data is processed accurately and efficiently. Informal enquiries regarding the role can be addressed to Adam Tyson (adam.tyson@ucl.ac.uk). This post is funded until September 2028 in the first instance with the possibility of extension subject to grant funding. To apply, please upload a current CV, complete the online application form, and use the supporting statement section or upload a cover letter to outline how you meet the essential and desirable criteria for the role. Please do not upload any additional attachments as these will not be considered by the selection panel. What we offer The post is based in London, suitable for hybrid working with a minimum of 40% of time onsite. As well as the exciting opportunities this role presents SWC offers staff an award winning work environment with state of the art facilities an on site brassiere and access to pleasant outdoor spaces. SWC staff receive the full range of UCL benefits. Our commitment to Equality, Diversity and Inclusion As London’s Global University, we know diversity fosters creativity and innovation, and we want our community to represent the diversity of the world’s talent. We are committed to equality of opportunity, to being fair and inclusive, and to being a place where we all belong. We therefore particularly encourage applications from candidates who are likely to be underrepresented in UCL’s workforce. These include people from Black, Asian and ethnic minority backgrounds; disabled people; LGBTQI+ people; and for our Grade 9 and 10 roles, women. You can read more about UCL's commitment to Equality, Diversity and Inclusion here You will have strong programming skills in Python along with extensive experience working with timeseries data. The ideal candidate will have experience working with extracellular electrophysiology and building data pipelines. You should have a strong interest in building easy to use software to help advance neuroscience and be comfortable working in teams of researchers and software engineers. The ideal candidate will have experience of good software engineering best practices and working on, and with open-source software.

Remote, Remote, USA HypothesisBase is seeking a curious & motivated python developer. The candidate will: Assist in the development & deployment of software applications using Python Conduct unit testing of applications Use Python for development, testing & outreach objectives Collaborate to identify project requirements, and deliver solutions To apply, you must complete the assessment at link: https://algorithmspath.com/assessments/1f3d0bc8-0b72-41a2-8184-19071ed080a9/start then send your resume to jobs@hypothesisbase.com. Requirements: Experience in source code management (git) Experience with Python Experience with Windows/Linux Willingness to learn new technologies Use software to achieve business goals Clear communicator Even if you don't meet all the above requirements, we'd still love to hear from you! We are goal-oriented & offer great flexibility.

Atlanta, US Responsibilities: Design and develop a real-time visualization and monitoring toolkit for distributed training workflows Maintain and improve the APPFL codebase, addressing bugs and performance issues Implement new features aimed at enhancing privacy-preserving federated learning Create clear and comprehensive documentation for all developed tools and features Support the growth and sustainability of the APPFL community through engagement and education Engage with users to address inquiries and promote best practices within the framework Participate in version releases and manage any necessary updates and changelogs Must: Proven experience in Python programming, particularly for production-quality code Strong knowledge of software engineering principles and practices Familiarity with real-time visualization and monitoring tools Experience with federated learning frameworks or similar technologies Proficient in documenting software solutions and providing clear user guidance Ability to optimize code for performance and scalability Excellent collaboration and communication skills Understanding of open-source development and community engagement Bachelors degree in Computer Science, Engineering, or related field, or equivalent experience