Python Developer with Data Experience

Hackajob Ltd; Greater London; On-site; GBP 61,000 - 101,000; Full time

Benefits offered by this job

Bonus scheme

Private healthcare insurance

25 days annual leave

Pension

Gym membership

Job summary

Solirius Reply, part of the Reply Group, is hiring a Data Engineer in Greater London. You will design, develop and maintain Python applications and data processing solutions, delivering scalable ETL/ELT pipelines for diverse data sets while ensuring data quality and performance.

You will work with APIs, databases and streaming systems, collaborating with engineers and architects to evolve data platforms. A UK security clearance is mandatory for this role and a strong background in Linux and

Qualifications

• Significant commercial experience developing Python applications and services.
• Strong experience in data engineering and scalable ETL/ELT pipelines.
• Proven experience with SQL, relational databases and large datasets.

Responsibilities

• Design, develop and maintain high-quality Python applications and data processing solutions.
• Build and optimise scalable ETL/ELT pipelines for structured and unstructured data.
• Develop robust data processing workflows using Python and modern data engineering tech.

Skills

Python development

Data engineering

SQL

PySpark

Pandas

Spark

Data quality

Data integration

Git

CI/CD

Linux

Security clearance

Collaboration

Tools

CI/CD tooling

Job description

Salary: £61,000 - 101,000 per year

Requirements

• Significant commercial experience developing Python applications and services.
• Strong experience in data engineering, including the design and development of scalable ETL/ELT pipelines.
• Proven experience working with SQL, relational databases and large datasets.
• Experience with data processing technologies such as PySpark, Spark or Pandas.
• Strong understanding of data quality, transformation and integration.
• Experience with Git, CI/CD and automated testing.
• Comfortable working in Linux and secure development environments.
• Experience delivering production-grade solutions within complex technical environments.
• Active UK Security Clearance (SC/DV) is mandatory for this role.

Responsibilities

• Design, develop and maintain high-quality Python applications, services and data processing solutions.
• Build and optimise scalable ETL/ELT pipelines for the ingestion, transformation and delivery of structured and unstructured data.
• Develop robust data processing workflows using Python and modern data engineering technologies.
• Work with large and complex datasets, ensuring data quality, integrity, availability and performance.
• Integrate data from multiple sources, including APIs, databases, files and streaming systems.
• Develop reusable, well-tested and maintainable software components following modern engineering practices.
• Design and implement automated testing, monitoring, logging and error-handling mechanisms.
• Collaborate with data engineers, software engineers, architects and other technical stakeholders to deliver end-to-end data solutions.
• Contribute to the design and evolution of data platforms, pipelines and supporting infrastructure.
• Identify opportunities to improve system performance, scalability, reliability and automation.
• Participate in code reviews and contribute to engineering standards and best practices.
• Work within secure development environments and adhere to relevant security, governance and compliance requirements.
• Produce clear technical documentation and contribute to architectural and engineering decisions.

Technologies

• AI
• CI/CD
• DevOps
• ETL
• Git
• Linux
• Python
• PySpark
• SQL
• Security
• Spark
• pandas
• Support

More

We are Solirius Reply, part of the Reply Group, a technology consultancy and digital transformation partner helping organisations solve complex challenges through strategy, design, engineering, and delivery. We work closely with our clients to deliver secure, accessible, user-focused services that evolve with their needs. Our consultants embed directly into client teams, delivering tailored solutions across public and private sectors. Our services span the full digital delivery lifecycle, including architecture, engineering, delivery management, user-centred design, business analysis, data, DevOps, and AI. We offer a competitive salary, bonus scheme, private healthcare insurance, 25 days annual leave plus bank holidays, up to 10 days allocated for development training per year, enhanced parental leave, paid fertility leave, pension, EAP with Help@Hand, gym membership benefits, cycle to work and electric vehicle schemes, flexible working, and annual away days/company socials. We are committed to equality, diversity, social mobility, and inclusive practices, with a supportive environment where our people can thrive.

last updated 40 week of 2026