Junior Developer

Junior Developer

03 March 2026

London, UK

An exciting opportunity has become available to be part of our fast-growing team and to be a key part of the Tech & Innovation function. This role provides an outstanding opportunity to join a growing global integrated marketing advisory and will provide an ambitious individual with valuable experience for progression and development.

The Company

mediasense is a global, independent advisor that brings the clarity, connection and confidence modern marketers need to fuel growth. We help marketers eliminate waste and maximize the impact of their most significant investments at scale. Our ambition is to define and own an entirely new category - recognized as the world's most trusted, independent and impactful marketing advisor. We do this by elevating how clients operate, how agencies deliver, how platforms perform, and how all parts of the ecosystem connect. Because progress doesn't happen in isolation, it takes alignment, intelligence, and trust. That's what we enable. That's what we stand for. That's Unified Marketing Intelligence.

mediasense is designed around how we help marketers optimize and transform through best-in-class structure and governance (Organization), partners and platforms (Ecosystem), governance and controls (Assurance), and measurement and effectiveness (Science). We have the proven ability to effectively support large, complex organizations and deliver multiple projects simultaneously. As evidenced through our strong track record with clients, we pride ourselves on the consistent high quality of service delivery and the ability to accelerate transformation and growth.

mediasense has over 200 employees across London, New York, Singapore and New Delhi. For more information, visit

The Role

This role is for a Junior Developer, based in London. This role will report into the Head of Engineering & DevOps.

The Junior Developer will support the design, development, delivery and maintenance of software platforms, and data-driven pipelines used by internal employees. With guidance from more experienced engineers, you will help improve existing systems, contribute to new initiatives, and gain exposure to modern engineering practices, tools, and ways of working. You will also develop an understanding of how technology supports mediasense's wider business objectives.

Responsibilities

• Software Development & Maintenance: Assist in developing, enhancing, and maintaining software applications and services under the guidance of senior engineers.
• Issue Investigation & Resolution: Help investigate bugs, incidents, and reported issues, learning how to identify root causes and implement effective fixes.
• Write Clean Code: Code that articulates its purpose, has low levels of complexity, has side-effects extracted when possible, and is easy to test.
• Understanding Business Systems: Build an understanding of mediasense's business processes, applications, and data flows to contribute to meaningful improvements.
• Collaboration & Teamwork: Work closely with members of the direct team, contributing to shared goals and supporting team delivery.
• Code Reviews & Feedback: Participate in code reviews as a learner, receiving constructive feedback and gradually contributing to reviews as your confidence grows.
• Continuous Improvement: Support initiatives to improve efficiency, scalability, and reliability of systems through automation and standardisation.

The Candidate

This role is well suited to someone early in their software engineering career who is eager to learn, enjoys solving problems, and wants to develop strong engineering fundamentals in a supportive and collaborative environment.

Qualifications

• Early Career Technical Skills: Experience in software development through education, placements, internships, personal projects, or a previous junior role. Familiarity with technologies such as Python, JavaScript/React, or SQL is beneficial but not essential.
• Willingness to Learn: A strong desire to learn new technologies, tools, and ways of working, with openness to feedback and guidance.
• Problem-Solving Mindset: An interest in understanding how systems work and a logical, methodical approach to solving problems.
• Communication Skills: Ability to communicate clearly and professionally with both technical and non-technical colleagues.
• Attention to Quality: An appreciation for well-written code, good documentation, and reliable systems, with an interest in continuous improvement.
• Technology Stack: Can consider a wide range of different technologies. The main application we are looking for use the following tech stack:
  • Backend: Python, FastAPI, SQLAlchemy, Pandas
  • Frontend: js & React
  • Infrastructure: AWS, including Lambda, all built via Terraform
  • Database: PostgreSQL
  • Containerisation: Docker

What We Offer

• Hybrid working
• 28 days holiday per year, up to a maximum of 32 days
• Work from any location in the world for up to 4 weeks per year
• 10 days Annual Leave Purchase per year
• Day off for your birthday
• Company bonus scheme
• Pension
• Private Healthcare
• Employee Assistance program
• Group Life insurance
• Annual season ticket loan
• Cycle to work scheme
• Eye test & contribution towards glasses for VDU
• Employee Referral Bonus
• New Business Bonus