Python Backend Developer at Mustard Systems | London

Join the Vanguard of InnovationAt Palantir, we are at the forefront of developing advanced software for data-driven decision-making and operational excellence. Our platforms empower organizations to harness data for transformative outcomes—be it in developing lifesaving pharmaceuticals, anticipating supply chain disruptions, or locating missing persons.Your ContributionAs a Systems Engineer within Palantir’s Technical Operations team, you will play a pivotal role in optimizing our core business processes and workflows. Your responsibilities will encompass designing, constructing, and sustaining the infrastructure that underpins our vital business functions, including financial reporting, sales operations, and personnel management. Collaborating with both internal teams and external partners, you will adapt industry tools to meet the dynamic needs of Palantir, while enhancing our utilization of Palantir Foundry and AIP for internal projects.In this capacity, you will provide strategic technical guidance to key stakeholders. A typical day may involve assessing new technological solutions, aligning tech initiatives with business objectives, resolving high-priority system challenges, and engaging in cross-functional collaboration to drive system enhancements. Success in this role requires adeptness in managing multiple business systems while demonstrating flexibility and adaptability to evolving requirements and challenges.

We are seeking a talented and driven Business Systems Lead to join our dynamic team at Wifinity Ltd. In this pivotal role, you will oversee and enhance our business systems, ensuring they align with our strategic objectives and deliver maximum efficiency. This position offers an exciting opportunity to lead projects that shape the future of our organization.

Are you ready to embrace a new challenge as a System Engineer? Join us in taking charge of the design, maintenance, and optimization of cutting-edge IT systems and infrastructure. If you have a passion for ensuring reliability, security, and scalability across the environments that power Aidence's global operations, we want to hear from you! Your drive for continuous improvement, coupled with your ability to streamline processes and collaborate with cross-functional teams, will be vital in delivering efficient, compliant, and high-performing systems.

Join Arondite as a Deployed Systems Engineer, where you will play a pivotal role in the deployment and management of advanced systems solutions. This position offers an exciting opportunity for technical professionals to showcase their expertise in a dynamic environment.

Join Alten as a Senior Systems Engineer and be part of a leading technology consultancy that specializes in engineering and IT services. In this critical role, you will drive innovative solutions and enhance system performance across various projects.

Join our dynamic team at Pace Consulting as a Systems Thinking Business Analyst, where you'll leverage your analytical skills to drive innovative solutions for a diverse range of clients. In this role, you will collaborate with cross-functional teams to analyze complex business challenges, develop actionable insights, and implement effective strategies that enhance organizational performance.

Join System Canada Technologies as a Linux Systems Configuration Engineer, where you'll play a crucial role in optimizing and configuring Linux systems to enhance operational efficiency. Collaborate with a dynamic team to ensure seamless deployment and maintenance of systems that support our innovative technology solutions.

Hudson River Trading (HRT) is seeking a talented Senior GPU Systems Engineer to join our dynamic Research and Development team. In this pivotal role, you will play a crucial part in scaling and advancing our sophisticated HPC/AI research infrastructure. Collaborating with a diverse team of experts, you will ensure our trading and research operations run seamlessly 24/7 across the globe. Your responsibilities will include the design and optimization of extensive GPU compute clusters, identifying and resolving performance bottlenecks, and automating system deployment and monitoring across thousands of nodes. This is a high-impact opportunity that requires innovative thinking and technical expertise in a fast-paced environment.

The Trade Desk is a leading global technology firm dedicated to establishing a more accessible and transparent internet through principled and intelligent advertising solutions. Our platform processes over 1 trillion queries daily, operating at an unparalleled scale. We pride ourselves on nurturing an award-winning culture rooted in trust, ownership, empathy, and collaboration. We celebrate the distinctive experiences and viewpoints that every individual contributes to The Trade Desk, and we are devoted to cultivating inclusive environments where everyone can express their authentic selves daily. Are you passionate about tackling complex challenges on a grand scale? Do you long to be part of a vibrant, globally-connected team where your efforts will significantly impact the creation of a better media ecosystem? Discover why Fortune magazine regularly recognizes The Trade Desk as one of the best small to medium-sized workplaces worldwide. About the Role: We are on the lookout for a Lead Systems Reliability Engineer to enhance our engineering team, focusing on the development and upkeep of our data-driven platform. Utilizing cutting-edge technologies such as Aerospike, MongoDB, and Kafka, we execute numerous real-time activities, achieving a remarkable p99 latency of under 1 millisecond on the backend! If you thrive on tuning, performance testing, troubleshooting, automation, and operating at scale, and if you find excitement in testing next-gen hardware, evaluating data access patterns, and architecting automation for distributed systems, we want to hear from you!

Join our dynamic team at Synthesia as an IT Systems and Support Engineer. You will play a pivotal role in managing and enhancing our IT infrastructure, providing exceptional support to our teams, and ensuring seamless technology operations. This is an opportunity to work with cutting-edge technology in a fast-paced environment while collaborating with a talented group of professionals.

Are you ready to embrace an exciting new opportunity as a System Engineer? At DeepHealth, we are seeking a dedicated professional who is eager to take charge of the design, maintenance, and optimization of our cutting-edge IT systems and infrastructure. Your role will be crucial in ensuring the reliability, security, and scalability of the environments that support our global operations. If you are passionate about driving continuous improvement, enhancing processes, and collaborating with diverse teams to deliver high-performing and compliant systems, we want to hear from you!

Join AECOM as the Head of Systems Engineering, where you will lead a team of skilled engineers in delivering innovative engineering solutions across various sectors. Your leadership will drive best practices in systems engineering, fostering a culture of excellence and collaboration. This role offers an exciting opportunity to influence project outcomes and ensure the successful integration of complex systems.

Statkraft is looking for a Senior Power Systems Engineer to join the London office. This position centers on creating solutions that address shifts in the energy sector. Role focus The Senior Power Systems Engineer will work on challenges related to the evolving energy landscape. The work involves applying deep knowledge of power systems to develop practical responses to industry changes. What you bring Expertise in power systems engineering Strong interest in shaping the future of energy systems

About YapilyAt Yapily, we are on a mission to redefine global interactions with financial value. We envision a world where financial friction is a thing of the past, empowering individuals and businesses to seamlessly access and transfer value.Our innovative open banking infrastructure is designed to facilitate rapid digital transformation for leading organizations like Adyen, Intuit QuickBooks, and Google. By offering services such as payment initiation, bank data access, and pre-built financial products, we enable businesses to innovate swiftly and expand the horizons of financial technology.As trailblazers in the open banking sector, we are committed to shaping the future of finance through unparalleled expertise and a steadfast dedication to innovation.Position OverviewAs we expand our operations and gear up for accelerated product-led growth, we seek a proactive and seasoned Business Systems Analyst. This hybrid position will blend project management and business analysis, focusing on enhancing our existing Open Banking PIS and AIS infrastructure. With our recent transition into the money flow and EMI regulation, you will play a crucial role in developing and improving various internal tools and platforms that ensure the efficient operation of our business.The ideal candidate will have experience in designing solutions for financial services in a dynamic environment, with exposure to Risk and Compliance management, Business Operations, and Treasury Management. You will thrive in collaborative settings and demonstrate a solutions-oriented attitude, comfortable in designing and implementing technology frameworks that support effective operations across multiple functions.Your strong communication skills will foster an environment where operational excellence is recognized and valued, and you will contribute to a collaborative, energetic team spirit.

About Gigs Gigs builds a platform that lets technology companies add global mobile connectivity to their products. The goal: make it as easy to offer mobile services as it is to set up payments. Gigs removes telecom complexity for customers ranging from fintech startups launching mobile plans to HR platforms managing work phones. The team includes about 100 people working across the US and Europe, backed by nearly $100 million from investors like Ribbit Capital, Google, and Y Combinator. Gigs brings together engineers, product specialists, and business leaders with backgrounds at Stripe, Airbnb, Shopify, and other top tech companies. The company is growing quickly and tackling both technical and regulatory challenges to make connectivity seamless. Core Values Speed: Work with urgency and treat each week as important for progress. Ownership: Take initiative when problems arise and act with autonomy. Customer Obsession: Focus on customer success as a measure of company success. Ambiguity: Use good judgment and instincts to make decisions, even with incomplete information. First Principles: Question established practices and seek to understand the reasons behind them. Role Overview: Senior IT Systems Engineer The Senior IT Systems Engineer will help ensure that everyone at Gigs has the access, tools, and support needed to work efficiently. This position focuses on building and automating corporate IT infrastructure. The role is hands-on and results-driven, joining as the third member of the Security & IT team. Locations London, Amsterdam, Berlin

About the TeamAt OpenAI, our Platform Systems team is at the forefront of innovation, merging advanced AI technologies with large-scale distributed systems. We create the engineering and research infrastructure essential for training OpenAI’s premier models on some of the world's most powerful, custom-designed supercomputers.Our dedicated team develops critical model training software, delving deep into the technical stack to enhance collective communication, optimize compute efficiency, refine parallelism strategies, and improve fault tolerance, failure detection, and observability. The systems we engineer are pivotal to accelerating OpenAI’s research, ensuring reliable and efficient training at the cutting edge of technology.We foster close collaboration with researchers throughout the organization, consistently integrating insights from across OpenAI to advance our training platform.About the RoleAs a Software Engineer specializing in Platform Systems, you will architect and develop distributed systems that enhance visibility into large-scale training workloads, ensuring their reliable operation at scale.Your responsibilities will include engineering failure detection, tracing, and observability systems to identify suboptimal or malfunctioning nodes, revealing performance bottlenecks, and enabling engineers to optimize extensive distributed training jobs. This infrastructure is vital for the functionality of OpenAI’s training stack and is continuously evolving to accommodate new use cases and increasingly intricate workloads.This position is central to our training infrastructure, merging systems engineering, performance analysis, and large-scale debugging.In This Role, You WillDesign and implement distributed systems for failure detection, tracing, and profiling large-scale AI training tasks.Create tools to detect slow, faulty, or erratic nodes, providing actionable insights into system performance.Enhance observability, reliability, and performance across OpenAI’s training framework.Diagnose and resolve challenges in complex, high-throughput distributed environments.Collaborate with systems, infrastructure, and research teams to elevate platform capabilities.Adapt and extend failure detection and tracing systems in support of new training methodologies and workloads.You Might Thrive in This Role If YouPossess a strong passion for performance, stability, and observability in distributed systems.Have experience with large-scale systems and are excited to tackle complex challenges in AI infrastructure.

Become a part of Fastned, leading the charge in Europe’s electric vehicle revolution! With over 400 team members from 45+ nationalities working across 10 countries, we are dedicated to transforming the energy landscape with a focus on reliability, sustainability, and clean energy solutions. Our accolades include being named the “Best Charging Network” in the UK, France, Switzerland, and the Netherlands, solidifying our position as an industry leader. This is your chance to make a meaningful impact in an exciting and rapidly evolving sector!In the role of Business Systems Specialist, you will be pivotal in aligning our business processes with cutting-edge technology. Your efforts will ensure that Salesforce effectively supports Fastned’s swift growth and enhances team efficiency. This hands-on, impactful position is set in an informal, international scale-up atmosphere that values inclusivity and a people-focused culture. If you have a passion for bridging the divide between business needs and technology solutions, we want to hear from you!Your ResponsibilitiesYou will act as both a system administrator and a business analyst, tasked with maintaining and enhancing our core business systems while collaborating with various teams throughout the organization. This role is part of our ‘Centre of Organisational Excellence’ team, with members based in our state-of-the-art London Shoreditch office, as well as in Madrid and Amsterdam. Your diverse responsibilities will include:System Administration & ConfigurationOversee user management, roles, permissions, and security settings within Salesforce, Sitetracker, and ServiceNow.Configure objects, fields, views, reports, dashboards, and automation processes (flows, rules).Assist with releases, testing, and change management, ensuring clear documentation and user communication.Business Analysis & Process ImprovementCollaborate with stakeholders from Architecture, Construction Management, and Operations to grasp their needs and goals.Evaluate business processes and workflows to uncover opportunities for system enhancements and automation.Convert business requirements into well-defined system configurations or user stories for development teams.Stakeholder CollaborationFacilitate close cooperation with various teams to ensure alignment on system improvements and changes.

EMBARK ON A REWARDING JOURNEY WITH YOUR CAREERAt Eurostar, we are at the forefront of transforming rail travel, operating across five countries and creating new opportunities for travelers. Our trains do more than just connect people; they play a vital role in fostering a greener and more inclusive future. By joining our dedicated team, you'll contribute to an inspiring mission that goes beyond transportation.We are seeking a talented Customer Systems Engineer to join our Rolling Stock team. In this role, you will be instrumental in enhancing customer-facing systems, ensuring that both front-line staff and our customers receive the tools and experiences they expect and deserve, all delivered in a timely fashion.This is a permanent position based on-site at our Temple Mills depot in Leyton. A hybrid work arrangement is available, requiring on-site attendance four days a week.Please note that the application deadline for this role is 5 PM on Tuesday, April 14, 2026. We encourage candidates to apply promptly, as Eurostar reserves the right to reach out to suitable candidates before the deadline and to close the position early if appropriate candidates are identified.

Hypersonica develops advanced defence technology across Europe, with a focus on speed, resilience, and strengthening technological independence. The company values technical excellence and seeks people who approach complex problems with creativity and urgency. Role overview This Junior Systems Engineer position is based in London and sits within a close-knit, skilled team. The role involves hands-on work on projects that influence the future of defence technology. Junior engineers here contribute directly to Hypersonica’s mission and ongoing growth. What makes this role unique Collaborate with experienced professionals in an environment where each team member’s work matters Tackle meaningful challenges and help develop quick, effective solutions Shape the position over time by drawing on your own strengths and interests Support projects that advance Europe’s technological autonomy Who succeeds at Hypersonica People with strong technical abilities and sound judgment Those who thrive both independently and within a team Candidates who have achieved results that others considered unlikely, or who bring a unique mix of skills Individuals ready to take on evolving responsibilities as their contributions grow Applicants with unconventional backgrounds or skills are encouraged to apply, especially if they have a record of delivering results in demanding situations.