Python Developer (PySpark & AWS Data Engineering) – Copenhagen

Twoday is the leading digital transformation partner in Northern Europe with a global presence. With approximately 3,000 employees, we collaborate with the most admired private and public organizations to deliver cutting-edge digital solutions. Our deep industry expertise spans Data & AI, software development, digital experiences, and business applications. Operating across the Nordics and Lithuania, our team generated a revenue of 280 million euros in 2023. We serve over 8,000 customers, supporting their digital transformation journeys.

Join Twoday and help build business-critical data solutions for one of Denmark's largest public sector organisations

At Twoday, we help organisations create lasting value through technology. We are looking for an experienced Python Developer to join our Digital Engineering team in a permanent role. You will initially be assigned to a long-term customer project in Lyngby, working as part of a dedicated onsite team delivering and maintaining business-critical data integration and analytics solutions.

As a Twoday consultant, you will be employed by Twoday on a permanent basis. Following the initial assignment, you will have the opportunity to work on other exciting customer engagements across Copenhagen.

The role

You will become part of a team responsible for operating, maintaining and further developing a number of data processing components that provide critical business data to BI tools and user interfaces used for planning and operational management.

The technology stack primarily consists of:

• Python
• PySpark
• AWS Glue
• AWS Step Functions
• Athena SQL
• GitHub

You will work closely with analysts, architects, developers and infrastructure specialists to design, develop and maintain robust, scalable and high-quality data solutions.

Your Responsibilities

Your responsibilities will include:

• Collaborating with the Value Team Lead and Business Analyst to ensure Jira issues contain sufficient information to support efficient and high-quality delivery
• Participating in backlog refinement and translating business requirements into robust technical solution designs
• Working with domain architects to validate and document technical solution designs
• Developing, maintaining and optimising PySpark code, AWS Glue jobs and Athena SQL scripts
• Promoting and applying best practices for PySpark and distributed data processing across the development team
• Designing and implementing unit tests in accordance with development standards
• Implementing data validation, error handling, logging and monitoring solutions, including Soda Core where applicable
• Producing and maintaining technical documentation and operational procedures
• Performing developer testing, participating in peer reviews and supporting the release process
• Creating and executing relevant test cases using Jira and Xray where required
• Documenting test results and supporting defect resolution
• Collaborating with infrastructure specialists on AWS platform maintenance and optimisation, including services such as S3, EC2, IAM, CloudWatch, Terraform and Jenkins
• Supporting knowledge sharing and ensuring effective handover of technical knowledge within the team

What we're looking for

We are looking for someone who brings solid technical expertise together with a collaborative mindset.

To succeed in this role, you should have:

• At least five years of relevant full-time professional experience developing Python-based data solutions using technologies such as PySpark, SQL and AWS
• Commercial experience with PySpark and distributed data processing
• AWS Glue and the wider AWS ecosystem
• SQL, preferably Athena SQL
• ETL development and data engineering best practices
• Git and modern version control workflows
• Unit testing and automated quality assurance
• Technical documentation and structured development processes
• Agile delivery methods and Jira

Experience with one or more of the following would be an advantage:

• AWS Step Functions
• Soda Core
• CloudWatch
• Terraform
• Jenkins
• Xray test management

You enjoy working closely with business stakeholders and technical colleagues and take pride in delivering maintainable, high-quality solutions.

Mandatory Requirements

To be considered for this role, you must:

• Be fluent in both spoken and written Danish
• Be able to work full-time onsite in Lyngby during the initial customer assignment
• Be willing to work onsite at customer locations across Copenhagen on future assignments, as customer requirements may vary and can include working onsite five days per week

Please note that while the initial assignment offers the possibility of working from home on Wednesdays, this arrangement is specific to the first customer engagement and cannot be guaranteed on future assignments.

What We Offer

At Twoday, you'll join one of the leading technology consultancies in the Nordics. We combine the stability of a well-established organisation with the flexibility, variety and professional development opportunities of consultancy.

We offer:

• Permanent employment with Twoday
• Challenging, business-critical projects
• Opportunities to work with modern cloud and data technologies
• Professional development and continuous learning
• A collaborative and highly skilled technical community
• Competitive salary and benefits

The process

• Telephone interview with a Talent Acquisition Partner
• Teams interview with hiring manager
• Technical assessment
• Onsite interview with hiring manager

About Twoday

Twoday has modern offices across more than 30 locations in Norway, Sweden, Denmark, Finland, and Lithuania. We offer an engaging working environment with strong professional expertise and a collaborative culture. With us, you will have the opportunity to develop both professionally and personally in an international and innovative organisation.

Diversity & Inclusion

Do you feel that you do not meet every requirement?

Studies show that women and other underrepresented groups are less likely to apply if they do not match every criterion. At Twoday, we are committed to building an inclusive workplace and encourage you to apply if this role appeals to you — even if your experience does not fully match the job description.