python developer

Citi

<div><h2 class="jobSectionHeader">Discover your future at Citi</h2>
Working at Citi is far more than just a job. A career with us means joining a team of more than 230,000 dedicated people from around the globe. At Citi, you&rsquo;ll have the opportunity to grow your career, give back to your community and make a real impact.
<h2 class="jobSectionHeader">Job Overview</h2>
Counterparty Credit Risk Analytics is a group within Citi Financial Risk Technology, responsible for developing the applications used for derivatives credit Risk and Basel Capital calculations Firm-wide.
The Counterparty Credit Risk Developer is an intermediate level position responsible for participation in the development and advancement of the derivatives credit risk application.
Core objectives will include developing and maintaining the applications calculating the Counterparty Credit Risk metrics. Additional objectives will include the contribution towards application execution analysis reports, monitoring and optimization of the application build and the enhancement of the end-to-end calculation test suite.
This is an excellent opportunity to gain exposure to a wide range of advanced technology paradigms like high performance grid computing.
 
It will provide significant opportunities to collaborate with teams in the broader internal network including Front Office Technology, Risk and Quant groups, and exposure to high performance computing and cloud.
Responsibilities:
<ul><li>Develop and maintain Counterparty Credit Risk applications
</li><li>Enhance and support CI/CD processes, including build, testing, and release management.
</li><li>Optimize codebase performance and facilitate the transition to cloud-based workflows.
</li><li>Expand and execute test suites (unit, regression, integration) and conduct performance/memory profiling.
</li><li>Create and maintain comprehensive documentation for applications and processes.
</li><li>Collaborate with Quant and Technology teams to integrate model updates and new technologies.
</li><li>Analyze complex issues and provide evaluative judgments on business and system processes.
</li><li>Serve as a Subject Matter Expert (SME) for senior stakeholders and team members, exercising independent judgment.
</li></ul>Qualifications:
<ul><li>Programming experience in Python, including systems analysis and software application development.
</li><li>Proficiency with UNIX shell scripting (e.g., bash, ksh) and version control software like Git.
</li><li>Experience with CI/CD pipeline technologies, such as Jenkins.
</li><li>Outstanding analytical and problem-solving skills with a thorough and detailed approach to accuracy.
</li><li>Experience in AWS cloud a plus.
</li><li>Excellent verbal and written communication skills in English.
</li><li>Ability to collaborate effectively within a large team of developers.
</li><li>Capacity to work under pressure, manage deadlines, and take ownership of tasks.
</li><li>Master&rsquo;s degree or equivalent in computer science, mathematics, engineering, or physics.
</li></ul>-
<h2 class="jobSectionHeader">Job Family Group:
</h2>Technology
-
<h2 class="jobSectionHeader">Job Family:</h2>
Applications Development
-
<h2 class="jobSectionHeader">Time Type:</h2>
Full time
-
<h2 class="jobSectionHeader">Most Relevant Skills
</h2>Please see the requirements listed above.
-
<h2 class="jobSectionHeader">Other Relevant Skills
</h2>For complementary skills, please see above and/or contact the recruiter.
-
Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.</div>

Counterparty Credit Risk Python Developer, AVP

Mustard Systems Ltd.

<div>
 At Mustard Systems, we leverage statistical modeling to dive into sports events and help us make informed predictions about future outcomes. By utilising our unique datasets, advanced statistical models, and custom-built software, we strive to accurately forecast sports results.
 
 
 We value quick delivery and real-world impact over perfect code. If you're an engineer who thrives on solving problems quickly and enjoys a flexible, outcome-focused culture, you'll fit right in.
 
 
 
 What You'll Work On:
 
 
 
 <ul>
 <li>
 Expand our access to new liquidity providers, through advanced web scraping and reverse engineering techniques
 </li>
 <li>
 Develop and maintain low-latency real-time data feeds, based on the data extracted, to support trading strategies
 </li>
 <li>
 Enhance system visibility for our teams to provide insight into integration issues and improvements
 
 
 </li>
 </ul>
 We work with an agile approach, following a flexible plan that adapts to new information and opportunities as they arise. Developers are a core part of this process, taking full ownership of their software throughout its lifecycle&mdash;from design and development to testing, review, and production support.
 
 
 
 Key Responsibilities
 
 
 
 <ul>
 <li>
 Design and Build Impactful Features: Develop new features that align with and drive our business goals, delivering high-quality code that brings measurable value
 </li>
 <li>
 Collaborate on Code Quality: Review and test code from teammates to ensure functionality, maintainability, performance, and quality standards
 </li>
 <li>
 Support in Production: Take ownership of your team's software in production, ensuring stability and quickly addressing any issues that arise
 </li>
 <li>
 Cross-Team Collaboration: Work closely with other development teams on cross-functional projects, and partner with traders and quants to design and implement the best solutions to real business problems
 </li>
 <li>
 Participate in Out of Hours Support for our Software Systems
 
 
 
 </li>
 </ul>
 
 Core Tech Stack:
 
 
 
 <ul>
 <li>
 Languages: Python (Python 3.10+), JavaScript/TypeScript for frontend work, and Go for select infrastructure
 </li>
 <li>
 Tools: RabbitMQ and Kafka for messaging, PostgreSQL and Redis for data storage
 </li>
 <li>
 Environment: Linux servers
 </li>
 <li>
 Observability: OpenTelemetry, Prometheus, Grafana and Zabbix
 
 
 
 </li>
 </ul>
 
 Requirements
 
 
 
 
 
 Must-Haves:
 
 
 
 <ul>
 <li>
 Strong background in software development, with strong experience with Python
 </li>
 <li>
 A degree in Computer Science or a numerical subject from a top university
 </li>
 <li>
 Exceptional communication skills, enabling you to convey complex technical ideas clearly to both technical and non-technical audiences
 </li>
 <li>
 Strong decision-making abilities, with a knack for making thoughtful trade-offs in both implementation and architectural choices, balancing innovation and practicality
 </li>
 <li>
 Experience with web scraping and reverse engineering techniques, including working against bot protection tooling
 </li>
 <li>
 At least 3 years experience in software development
 
 
 
 </li>
 </ul>
 
 Nice-to-Haves:
 
 
 
 <ul>
 <li>
 Familiarity with building event-driven systems
 </li>
 <li>
 Comfort with Linux/Unix environments
 </li>
 <li>
 Track record of driving successful cloud migrations, ideally to AWS, including setting up secure, scalable account and access structures
 
 
 
 </li>
 </ul>
 
 Benefits
 
 
 
 
 
 Why join Mustard Systems?
 
 
 
 <ul>
 <li>
 Hybrid working environment. We're in the office every Monday, Tuesday and Thursday, and work from home every Wednesday and Friday
 </li>
 <li>
 Work on cutting-edge systems in a competitive and innovative field
 </li>
 <li>
 Collaborate with a smart, driven team, where your contributions directly impact business performance
 </li>
 <li>
 Opportunity to drive the company's technical direction and double its revenue in the next three years
 
 
 
 </li>
 </ul>
 
 Comprehensive benefits, including:
 
 
 
 <ul>
 <li>
 Competitive salary and significant bonus potential
 </li>
 <li>
 Enhanced pension match with salary sacrifice option
 </li>
 <li>
 Health insurance and life assurance
 </li>
 <li>
 Sabbatical leave after five years
 </li>
 <li>
 33 days of annual leave (including bank holidays)
 </li>
 </ul>
</div>

Python Backend Developer

Client Server

<div>
 
 
 
 Software Engineer / Developer (Python SQL) London to &pound;150k+
 
 
 
 
 
 
 
 Are you a data savvy Software Engineer with strong Python coding skills?
 
 
 
 
 
 You could be joining a Hedge Fund with complex work and substantial bonus earning potential.
 
 
 
 
 
 As a Software Engineer you will join a growing team building a modern medallion architecture data platform, working across everything from data engineering and distributed systems to infrastructure and frontend. This is a hands-on role in a small, collaborative team where you'll have real ownership and impact.
 
 
 
 
 
 
 Your role:
 
 
 <ul>
 <li>
 Design and build data platform components using Python
 </li>
 <li>
 Develop and optimise ETL pipelines, Data Lakes/ Lakehouses and distributed systems
 </li>
 <li>
 Improve infrastructure, observability and CI/CD practices
 </li>
 <li>
 Maintain and evolve existing systems (microservices, ETL, Excel add-ins)
 </li>
 <li>
 Support platform operations, ensuring reliability and performance
 </li>
 </ul>
 
 
 
 
 
 Location / WFH:
 
 
 
 You'll join colleagues in the impressive Central London office on a fulltime basis, Monday to Friday.
 
 
 
 
 
 
 About you:
 
 
 <ul>
 <li>
 You have strong backend development experience with Python
 </li>
 <li>
 You have experience of working with financial or market data
 </li>
 <li>
 You have experience of designing and operating data-intensive and distributed systems
 </li>
 <li>
 You have a strong knowledge of databases (Relational, NoSQL and Columnar)
 </li>
 <li>
 You're keen to take ownership and work across the full development lifecycle
 </li>
 <li>
 You're collaborative and pragmatic with strong stakeholder management skills
 </li>
 <li>
 You have achieved a 2.1 or above in a STEM discipline, likely to have studied to MSc
 </li>
 </ul>
 
 
 
 
 
 What's in it for you:
 
 
 
 As a Software Engineer / Developer (Python SQL) you will receive a competitive package:
 
 <ul>
 <li>
 Salary to &pound;150k
 </li>
 <li>
 Bonus
 </li>
 <li>
 Pension
 </li>
 <li>
 Self development and career progression opportunities
 </li>
 </ul>
 
 
 
 
 
 Apply now
 
 to find out more about this Software Engineer / Developer (Python SQL) opportunity.
 
</div>

Software Engineer Python SQL - Market Data

<div>At CGI, you'll help deliver secure, high-impact solutions that enable government agencies to tackle some of their most complex and mission-critical challenges. As a Python Software Engineer, you'll work with modern technologies to build secure, scalable and reliable systems that drive real-world outcomes. You'll collaborate with talented colleagues, contribute innovative ideas, and take ownership of technical solutions in an environment that values continuous learning, creativity and professional growth. If you're passionate about solving complex engineering problems and want to make a meaningful impact while developing your career, CGI offers the opportunity to do just that. 
 
CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK &lsquo;Best Employer&rsquo; by the Financial Times. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant. Join us and you&rsquo;ll be part of an open, friendly community of experts. We&rsquo;ll train and support you in taking your career wherever you want it to go. 
 
Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. This is role is required on a secure site.
Your future duties and responsibilities
In this role, you will develop secure, scalable Python applications that support mission-critical programmes within CGI's Space, Defence and Intelligence business. Working as part of a collaborative, cross-functional engineering team, you will design, build, test and enhance software solutions using modern development practices, while contributing ideas that help solve complex technical challenges. You'll take ownership of your work, share your expertise by mentoring colleagues, and play a key role in delivering high-quality solutions that make a tangible impact for our clients. 
 
You'll also contribute to the continuous improvement of engineering standards, helping to evolve development processes, adopt new technologies and maintain a strong focus on quality, security and innovation throughout the software lifecycle. 
 
Key responsibilities: 
 
~Develop &amp; Deliver secure, scalable Python software using modern engineering practices. 
~Design &amp; Document technical solutions and software components. 
~Build &amp; Maintain data processing pipelines for complex applications. 
~Test &amp; Assure quality through unit, integration and end-to-end testing. 
~Collaborate &amp; Mentor within cross-functional Agile delivery teams. 
~Optimise &amp; Improve development processes using DevOps and CI/CD practices. 
~Innovate &amp; Solve complex technical challenges with creative engineering approaches. 
~Support &amp; Enhance cloud-based and virtualised environments where appropriate.
Required qualifications to be successful in this role
You'll be an experienced Python Software Engineer with a passion for developing high-quality software and solving challenging technical problems. You will be comfortable working within collaborative delivery teams, have strong communication skills, and enjoy continuously learning new technologies. Experience across modern software engineering, testing and cloud-based environments will enable you to succeed in this role. 
 
Essential qualifications: 
 
~You should have at least five years' experience developing software using Python, including object-oriented and functional programming. 
~Strong experience working within cross-functional software development teams. 
~Proven ability to mentor and support junior engineers. 
~Experience with unit, integration and end-to-end testing, with a quality-first mindset. 
~Experience producing technical designs and documentation. 
~Experience developing or maintaining data processing pipelines. 
~Working knowledge of DevOps practices and cloud or virtualisation platforms. 
~Strong interpersonal and stakeholder communication skills. 
~Demonstrable enthusiasm for learning new technologies and driving innovation. 
 
Desirable: 
 
~Experience with AWS. 
~Experience using Elasticsearch and Kibana. 
~Containerisation experience with Docker, Kubernetes and/or OpenShift. 
~Knowledge of security technologies and protocols, including PKI and TLS. 
 
#LI-JS2
Together, as owners, let&rsquo;s turn meaningful insights into action. 
 
Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you&rsquo;ll reach your full potential because&hellip; 
 
You are invited to be an owner from day 1 as we work together to bring our Dream to life. That&rsquo;s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company&rsquo;s strategy and direction. 
 
Your work creates value. You&rsquo;ll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise. 
 
You&rsquo;ll shape your career by joining a company built to grow and last. You&rsquo;ll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.
 
 
That same commitment to fairness extends to how we use technology. To support our recruitment team, AI tools may be used to help assess applications though they never replace human judgement. All hiring decisions remain entirely in the hands of our recruitment professionals. 
 
Come join our team&mdash;one of the largest IT and business consulting services firms in the world.</div>

Python Developers

Wise

<div>Company Description 
Wise is a global technology company, building the best way to move and manage the world&rsquo;s money. 
Min fees. Max ease. Full speed.
Whether people and businesses are sending money to another country, spending abroad, or making and receiving international payments, Wise is on a mission to make their lives easier and save them money.
As part of our team, you will be helping us create an entirely new network for the world's money. 
For everyone, everywhere.
More about our mission and what we offer. 
Job Description 
We are seeking a talented quantitative developer to join our Treasury Markets Data Science team. This role focuses on owning and operating the production infrastructure behind our FX pricing, risk, and trading systems with the opportunity to broaden the scope of work into traditional quant aspects.
Your work will have a direct impact on Wise&rsquo;s mission and millions of our customers. 
About the Role:
You'll join the Treasury Markets Data Science team, owning the quantitative infrastructure that powers how Wise manages FX risk across a USD 250bn+ in annual FX volume- serving everyone from retail customers sending money abroad to tier-1 banks via Wise Platform.
The wider Treasury FX team includes quants, traders, analysts, product managers and engineers working together to price, hedge, manage and scale FX operations within Wise in real time. Within that, the Data Science team owns the quantitative platform:
We run a Python-first, production-grade quant platform: real-time curve construction, multi-instrument pricing, risk analytics, and trading strategy - all built and operated by the same team. Your primary focus is keeping these systems reliable, performant and well-engineered - while thinking deeply about how they serve customers and products. You'll also contribute to the quantitative models themselves as you grow into the domain.
What you&rsquo;ll own<ul><li>
Python microservices that run quantitative models in production</li><li>
Monitoring, alerting, and reliability for real-time pricing and risk systems</li><li>
Shared quant libraries used across multiple services</li><li>
CI/CD pipelines, deployment and operational excellence</li><li>
Incident response and root cause analysis for production issues</li></ul>
Where you&rsquo;ll grow<ul><li>
Real-time curve construction (yield curves, FX forwards, vol surfaces)</li><li>
Pricing models for new instruments and products</li><li>
Trading strategy development and optimisation</li><li>
Risk modelling alongside the Risk team (VaR, stress testing, scenario analysis)</li><li>
Backtesting frameworks and model validation</li><li>
Customer behaviour modelling, pricing strategy and product launch support</li><li>
Collaborating with product teams to translate quantitative insights into customer-facing decisions</li></ul> 
Qualifications 
What we&rsquo;re looking for<ul><li>
4+ years building and maintaining production Python systems</li><li>
Strong experience with microservices, databases, and production infrastructure</li><li>
Experience with streaming systems, real-time data pipelines, or event-driven architectures (Kafka, Flink, Redis etc.)</li><li>
Quantitative background - maths, physics, engineering or finance - you can read a model and reason about correctness</li><li>
Experience with testing, monitoring, and debugging complex systems under load</li><li>
A product mindset - you think about who uses your systems and why</li><li>
Clear communicator who can work cross-functionally with other quants, analysts, traders, product managers and engineers</li></ul>
It&rsquo;s a bonus if you are familiar with<ul><li>
FX or financial markets experience</li><li>
Term structure modelling, stochastic calculus or Monte Carlo methods</li><li>
Interest rate curve bootstrapping</li><li>
Algorithmic execution experience</li><li>
Data lake or warehouse experience (Snowflake, Iceberg, Spark etc.)</li></ul>
We&rsquo;re people without borders &mdash; without judgement or prejudice, too. We want to work with the best people, no matter their background. So if you&rsquo;re passionate about learning new things and keen to join our mission, you&rsquo;ll fit right in.
Also, qualifications aren&rsquo;t that important to us. If you&rsquo;ve got great experience, and you&rsquo;re great at articulating your thinking, we&rsquo;d like to hear from you.
And because we believe that diverse teams build better products, we&rsquo;d especially love to hear from you if you&rsquo;re from an under-represented demographic 
Additional Information<div></div> 
For everyone, everywhere. We're people building money without borders &mdash; without judgement or prejudice, too. We believe teams are strongest when they are diverse, equitable and inclusive.
We're proud to have a truly international team, and we celebrate our differences. 
Inclusive teams help us live our values and make sure every Wiser feels respected, empowered to contribute towards our mission and able to progress in their careers.
If you want to find out more about what it's like to work at Wise visit Wise.Jobs.
Keep up to date with life at Wise by following us on LinkedIn and Instagram.</div>

Lead Data Scientist (Quant) - Treasury FX

JPMorganChase

<div>JOB DESCRIPTION 
 
 
We have an opportunity to impact your career and provide an adventure where you can push the limits of what's possible.
As a Lead Software Engineer at JPMorgan Chase within Quantitative Execution Strategies Tech, you are an integral part of an agile team that works to enhance, build, and deliver trusted market-leading technology products in a secure, stable, and scalable way. As a core technical contributor, you are responsible for building critical technology solutions across multiple technical areas within various business functions in support of the firm's business objectives.
Team Overview:
The QES (Quantitative Execution Strategies) infrastructure supports the execution of cross-markets intraday trading strategies. It is a large growth area for JP Morgan's markets franchise, and will see significant additional investment over the next year to further our excellence in the business. The team's responsibility includes the design, build and support of the platform. The work requires close collaboration with our front office partners from sales, trading and quantitative research.
Job Responsibilities:
<ul><li>Executes creative software solutions, design, development, and technical troubleshooting with ability to think beyond routine or conventional approaches to build solutions or break down technical problems</li>
<li>Develops secure high-quality production code, and reviews and debugs code written by others</li>
<li>Identifies opportunities to eliminate or automate remediation of recurring issues to improve overall operational stability of software applications and systems</li>
<li>Leads communities of practice across Software Engineering to drive awareness and use of new and leading-edge technologies</li>
<li>Acts as a front office developer within the QES technology team.</li>
<li>Collaborates closely with front office teams (trading, structuring) to support the QES platform.</li>
<li>Develops platform and visualization components required by the desk.</li>
<li>Utilizes principal technologies such as Java, Python and TypeScript (React) within the team.</li>
</ul>Required Qualifications, Capabilities, and Skills:
<ul><li>Formal training or certification on software engineering concepts and proficient advanced experience</li>
<li>Hands-on practical experience delivering system design, application development, testing, and operational stability</li>
<li>Advanced in Python programming language</li>
<li>Excellent analytical skills (i.e. problem solving)</li>
<li>Experience in leading an agile delivery team leveraging scrum, sprint planning, retrospectives and reporting progress to senior stakeholders.</li>
</ul>Preferred Qualifications, Capabilities, and Skills:
<ul><li>Experience of working in a front office environment within financial services</li>
<li>Knowledge of Java, Python, Typescript, React</li>
</ul>ABOUT US
 
 
J.P. Morgan is a global leader in financial services, providing strategic advice and products to the world's most prominent corporations, governments, wealthy individuals and institutional investors. Our first-class business in a first-class way approach to serving clients drives everything we do. We strive to build trusted, long-term partnerships to help our clients achieve their business objectives. 
<div><div>We recognize that our people are our strength and the diverse talents they bring to our global workforce are directly linked to our success. We are an equal opportunity employer and place a high value on diversity and inclusion at our company. We do not discriminate on the basis of any protected attribute, including race, religion, color, national origin, gender, sexual orientation, gender identity, gender expression, age, marital or veteran status, pregnancy or disability, or any other basis protected under applicable law. We also make reasonable accommodations for applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs. Visit our FAQs for more information about requesting an accommodation. 
</div></div> 
 
ABOUT THE TEAM
 
 
J.P. Morgan's Commercial &amp; Investment Bank is a global leader across banking, markets, securities services and payments. Corporations, governments and institutions throughout the world entrust us with their business in more than 100 countries. The Commercial &amp; Investment Bank provides strategic advice, raises capital, manages risk and extends liquidity in markets around the world.</div>

Senior Lead Software Engineer - Python / Java

HCLTech

City Of London, England
 Job Summary
 As a Subject Matter Expert in Support & Operations, you will play a vital role in ensuring the timely resolution of escalated incidents while adhering to quality standards and service level agreements (SLAs). Your expertise in Terraform and Python will empower you to analyze complex issues, mentor team members, and maintain effective communication with stakeholders, ultimately aiming for high customer satisfaction and operational excellence.
 Key Responsibilities
 1. Utilize Terraform And Python To Automate Incident Resolution Processes, Ensuring On-Time Delivery While Adhering To Quality Compliance And Sla Requirements.
 2. Mentor Team Members And Administrators By Providing Guidance On Best Practices In Support Operations, Preparing Standard Operating Procedures (Sops), And Maintaining Comprehensive Documentation.
 3. Collaborate With Cross-Functional Teams To Validate Change Order Implementation Plans, Ensuring Adherence To Human Error Compliance And Contributing To Capacity Planning Initiatives.
 4. Engage With Customers Through Meetings To Gather Feedback And Understand Issues, Ensuring A Positive Customer Experience And Satisfaction With Support Services.
 5. Conduct Root Cause Analysis And Trend Analysis Using Python Scripts And Data Analysis Techniques, Presenting Findings And Actionable Insights To Key Business Stakeholders To Drive Performance Improvements.
 Skill Requirements
 1. Proficiency In Terraform For Infrastructure As Code And Automation.
 2. Strong Programming Skills In Python For Data Analysis And Process Automation.
 3. Familiarity With Git And Github For Version Control And Collaboration.
 4. Experience With Cloudbuild For Continuous Integration And Deployment.
 5. Knowledge Of Ansible For Configuration Management And Automation.
 
Other Requirements
 1. Optional Certifications: Hashicorp Certified: Terraform Associate, Python Institute'S Pcap Ã¯Â¿Â½ Certified Associate In Python Programming, Or Related Certifications That Demonstrate Knowledge In The Relevant Technologies
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SME - Terraform,Python,Google Cloud Build,Ansible

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