Python Developer (Contract / FTC) – London

Delta Capita Group; City of London; Hybrid; GBP 50,000 - 70,000; Full time

Job summary

A leading financial services provider in London is seeking a skilled Python Developer for a hybrid position. The candidate will develop scalable solutions focusing on data transformation and API integration. Key responsibilities include designing Python codebases and managing CI/CD pipelines. Strong experience in financial services is preferred. This contract position offers competitive rates.

Qualifications

• Proven experience in financial services or regulated environments.
• Able to work independently and manage deliverables in a fast-paced setting.
• Strong understanding of exception handling and error management.

Responsibilities

• Design and develop modular, maintainable Python codebases.
• Build and expose RESTful APIs using FastAPI or Flask.
• Handle complex data ingestion and transformation tasks.

Skills

Advanced proficiency in Python 3.x

Expertise in Pandas and NumPy

RESTful API development

CI/CD pipeline experience

Basic Docker knowledge

Strong communication skills

Job description

Location: London (Hybrid)

Rate: TBC

Duration: 6 months (with potential extension)

Start Date: ASAP

This is a great opportunity for a highly skilled Python Developer to support a strategic client engagement. We are looking for candidates who can deliver robust, scalable Python solutions across data transformation, API integration, and deployment pipelines.

Key Responsibilities

• Design and develop modular, maintainable Python codebases using both procedural and object-oriented paradigms.
• Build and expose RESTful APIs using FastAPI or Flask, ensuring secure integration with API Gateway.
• Handle complex data ingestion and transformation tasks using Pandas and NumPy.
• Implement field-level and cross-file data validation checks, ensuring schema integrity and referential consistency.
• Collaborate with DevOps teams to deploy solutions via CI/CD pipelines (GitHub Actions, Azure DevOps).
• Configure environments, manage secrets, and support containerisation using Docker.

Required Skills & Experience

Core Python Development

• Advanced proficiency in Python 3.x
• Strong understanding of exception handling and error management
• Experience in modular code design for scalability

Data Handling & Transformation

• Expertise in Pandas and NumPy for:
• Bulk data ingestion
• Multi-file processing
• Schema validation and cleansing
• Familiarity with rule engines or custom validation frameworks

API & Integration

• RESTful API development using FastAPI or Flask
• JSON/XML payload handling, request/response management
• Authentication protocols (OAuth2, RBAC)

DevOps & Deployment

• CI/CD pipeline experience (GitHub Actions, Azure DevOps)
• Basic Docker knowledge and cloud deployment familiarity
• Environment configuration and version control best practices

Ideal Candidate Profile

• Proven experience in financial services or regulated environments
• Able to work independently and manage deliverables in a fast-paced setting
• Strong communication skills and stakeholder engagement

How We Work

Delta Capita is an equal opportunity employer. We positively encourage applications from suitably qualified and eligible candidates regardless of age, colour, disability, national origin, ancestry, race, religion, gender, sexual orientation, gender identity and/or expression, veteran status, genetic information, or any other status protected by applicable law.

We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. If you require any reasonable adjustments through your interview process, please use the designated space within the application questionnaire.

This is a Contract or FTC position located in London with hybrid working. As the selection and interview process is ongoing, please submit your application in English as soon as possible, if your profile is selected, a member of our team will contact you within 4 weeks. For this role a valid working permit for the UK is mandatory.

Who We Are

Delta Capita Group (a member of the Prytek Group) is a global managed services, consulting and solutions provider with a unique combination of experience in Financial Services and technology innovation capability. Our mission is to reinvent the financial services value chain providing technology based mutualised services for financial institutions for non-differentiating services.

Our 3 offerings are

• Managed Services
• Consulting
• Technology

To know more about Delta Capita and our culture click here: