Senior Backend Engineer
Liberty Global
- London, England, United Kingdom
- London, England, United Kingdom
Über
We work closely with local authorities and businesses to deliver reliable, high quality charging networks at pace, at scale and at zero cost.
We offer all the advantages of being a scale‑up business, but with the added security and long‑term backing from well‑known parents – Liberty Global (who also own our delivery partner, Virgin Media O2) and Zouk Capital (who manage the Government’s Charging Investment Infrastructure Fund).
You’ll be joining this exciting journey at the start of our scale‑up phase, and work with us to hit the ambitious targets our shareholders have set. You’ll become part of a passionate and supportive team in a fast‑paced, dynamic and result‑driven environment.
About the role We are seeking an experienced Senior Software Engineer (Backend) to lead the development of our in‑house Charge Point Management System (CPMS) and customer‑facing app and web portal. Reporting into the Head of Engineering, this role will be responsible for enhancing these platforms to achieve feature parity with the incumbent SaaS solution. Following the migration, the focus will be on designing and implementing innovative features to create a market‑leading, scalable, and secure platform.
Key responsibilities
Backend Development:
Develop scalable and secure applications using
Python
with
FastAPI
on the backend.
Design and implement reusable, modular code for both client and server‑side components.
API & Microservices Design:
Define and build RESTful APIs and microservices using
FastAPI
that are efficient, secure, and scalable.
Create data models with
SQLAlchemy
for seamless database interaction.
System Performance & Reliability:
Conduct performance profiling and debugging to optimize system speed and reliability.
Use containerization tools like
Docker
for scalable deployments.
OCPP/OCPI Libraries:
Integrate
OCPP/OCPI protocols
into the CPMS to enable seamless communication with charging hardware and integration with third‑party services like EV roaming and payment service providers.
Collaboration & Mentorship:
Partner with product managers and designers to define technical requirements and ensure alignment with business goals.
Mentor junior developers, providing guidance on best practices and code reviews.
Continuous Improvement:
Stay updated with industry trends and implement improvements to ensure the system remains cutting‑edge.
Explore new tools & libraries which can improve the system, building prototypes to test
Integrate feedback from customers into the product, and define and deliver metrics to improve the product
About you At Believ, we are building a culture that attracts and retains the best talent. We are a dedicated and high‑performing team, accustomed to working at pace in an ever‑evolving industry, and we are looking for people who are as passionate as us about cutting carbon emissions and providing cleaner air for all. The successful candidate will have the following attributes and skills:
Knowledge & Experience
Proven track record of delivering scalable and secure applications.
Experience working with cloud‑based environments, particularly AWS.
Familiarity with performance optimization and debugging tools.
Knowledge of database design principles and SQL optimization.
Engineering Mindset
Ability to understand and consider the broader business context and long‑term implications of technical decisions.
Willingness to take ownership, innovate, and proactively seek opportunities to drive impact beyond immediate tasks.
Strong focus on delivering solutions that align with business goals and address real‑world challenges effectively.
Commitment to delivering exceptional user experiences by prioritizing customer needs and feedback throughout the development process.
Demonstrate enthusiasm, resilience, and a can‑do approach to tackling challenges and driving success.
Skills & Abilities
Expertise in
Python ,
FastAPI ,
SQLAlchemy .
Proficiency with containerization tools like
Docker
and infrastructure‑as‑code tools such as
Terraform .
Familiarity with
OCPP/OCPI protocol integration .
Experience designing scalable APIs and microservices.
Excellent communication skills and a collaborative mindset.
Benefits
Competitive salary and bonus scheme
25 days’ annual leave, plus the usual 8 UK Bank Holidays and the option to purchase up to 5 additional days per year*
Access to wellbeing and mental health benefits such as the Calm app, personal medical insurance, critical illness cover, dental, optical & travel insurance, income protection and life assurance
Pension contribution matched up to 10%
Access to our car benefit scheme and cycle to work scheme
Access to our online learning platform to continue to develop and grow your career with us.
16 hours a year Volunteer Time Off to support causes that are important to you
Virgin Media / O2 discounts and offers
Access to VIP Arena Suites at the O2 Arena (London) and First Direct Arena (Leeds)
Enhanced parental leave policies
* This perk can only be availed for the following calendar year by employees who started before 1st December
Location The business is currently based in our office in Southwark. The position is full time, hybrid with 3 days (Tuesday, Wednesday & Thursday) based in the office. Believ is an equal opportunity employer. We embrace diversity and are committed to creating an inclusive environment for our people.
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. Please contact us to request accommodation.
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Sprachkenntnisse
- English
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