Senior JavaScript Full Stack Developer - London

Location: Offices in London (City) & Hampshire (Fleet)
About Us

Alphix is a privately held, forward-thinking business part of Fundamental Group, an award-winning, global leader in the B2B and financial marketing services sector. As a fast-paced scale-up, Alphix is experiencing rapid growth, securing an increasing number of clients and delivering cutting-edge, privacy-first marketing technologies. Our solutions empower B2B marketers to become more agile and responsive through the power of AI and data.
This is a highly innovative environment that thrives on change. We seek individuals who embrace transformation, dislike stagnation, and have a deep sense of autonomy and accountability. At Alphix, your contributions directly shape the future of B2B marketing.

The Role

We are seeking an experienced Senior JavaScript full stack developer who loves modern web design and backend development, has a great eye for detail and is excellent problem solver. Naturally you will be able to produce great UI/UX in conjunction with our designers and be able to take on complex backend development using NodeJS and your database skills. You will be self-motivated and able to take on project briefs and lead technical projects regularly as well as assisting other engineers openly.

Key Responsibilities:

• Own Project Delivery: Take ownership of development projects, delivering high-quality work within agreed timelines and scope. Communicate risks early and keep the product team informed to ensure smooth and transparent collaboration.
• Drive Cross-Functional Collaboration: Work closely with stakeholders and product managers, designers, to translate business needs into actionable technical solutions.
• Support Estimation and Risk Management: Collaborate with the product team to provide realistic estimates, identify potential technical risks early, and play an active role in finding solutions to keep projects on track.
• Build with Security, Speed, and Scale in Mind: Make sure the features we build are safe, run fast, and can handle growth, by following best practices and staying mindful of how our choices today affect performance and scalability tomorrow.
• Write and Review Quality Code: Deliver secure, high-quality code, and help maintain high standards by reviewing, debugging, and improving code written by others.
• Maintain High-Quality Engineering Documentation: Create, organize, and continuously update technical documentation to ensure clarity, knowledge sharing, and long-term maintainability of systems and features.
  
  

Qualifications & Experience:

• Proven track record as a Senior Software Engineer in a SaaS environment.
• Deep technical expertise in:
• Databases such as MySQL, Singlestore, and BigQuery.
• Expertise working with third party data feed APIs.
• Strong understanding of software engineering best practices, feature deployment processes and testing.
• Ability to drive rapid decision-making, manage competing priorities, and deliver under pressure.
• Strategic thinking combined with a hands-on ability to execute technical solutions.
• Strong problem-solving and communication skills in a collaborative, fast-paced environment.
• Experience developing and maintaining clear, well-structured engineering documentation.
• Experience in high-growth startup or scale-up businesses is highly desirable.
• Passion for continuous learning, improvement, and operational excellence.
• Proactive, self-motivated, and eager to take on technical ownership.
• Experience working with remote or hybrid teams.
  

What we offer:

• Supportive, friendly colleagues who work together to achieve shared goals.
• Competitive salary and a discretionary bonus.
• Career growth opportunities: We're committed to your success and offer recognition, rewards, and the training and support needed for advancement.
• A dynamic and innovative work environment within a contemporary, team-focused, and forward-thinking company.
• 100% Club: A prestigious, peer-nominated award where top performers earn an all-expenses-paid vacation (previous destinations include Dubai, skiing in France, diving in the Red Sea, and Mykonos).
• Excellent benefits including pension contribution, private healthcare, life cover, cycle scheme, season ticket loans, 25 days' annual leave pro rata, 2 days paid leave for charity work, study loans and free snacks in the office.
  

If you're looking for a company that values your contributions, invests in your development, and offers exciting rewards, Fundamental Media is the place for you!

We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/beliefs, sexual orientation, or age.

Personal data collected will be used for recruitment purposes only. Strictly no agencies.