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Senior Software Engineer - HubSpot (Contract)

Senior Software Engineer - HubSpot (Contract)

On site

London, United kingdom

£ 590 /day

Senior

Freelance

13-02-2026

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Skills

Communication Leadership Problem Solving JavaScript TypeScript HubSpot DevOps Architecture Azure node.js AWS GCP

Job Specifications

We're partnering with a fast-growing sports/entertainment business to hire a Senior Backend Engineer with hands-on experience in HubSpot and complex backend systems. This is a 6-month contract, outside IR35, with potential for extension or permanent conversion.

The Role

You'll take full ownership of the Commercial Data Manager (CDM) platform and the HubSpot ecosystem, bringing previously external-managed systems fully in-house. This role combines backend development, integrations, and stakeholder collaboration, giving you real technical leadership and system ownership from day one.

Key Responsibilities:

Lead the CDM platform (70%) and HubSpot system (30%)

Take over HubSpot maintenance, expansion, and integrations

Collaborate closely with commercial stakeholders to implement new fields/features

Mentor engineers and shape team practices

Drive architecture and integration decisions across multiple services

Team Environment:

Distributed across UK & Poland

Key stakeholders: Architect, Engineering leadership, Delivery, Commercial team

Hybrid environment with flexible UK/EU remote options; Holborn office optional

Required Skills & Experience

Must-have:

Node.js / TypeScript / JavaScript in production

Experience with large, complex backend systems

Cloud experience (preferably AWS; GCP/Azure also fine)

System design & architecture experience

Integration-heavy environments

Previous HubSpot experience essential

Priority Skills:

Mentorship, leadership, and architecture thinking

Collaboration with product and engineering stakeholders

Scaling complex backend systems

Nice-to-have:

DevOps/SRE awareness

High-scale platforms (gaming, sports, fintech, marketplaces)

Experience with complex workflows or multi-service integrations

Experience Level:

6-8+ years, hands-on senior engineer

Soft Skills & Culture Fit

Strong communication and collaboration skills

Leadership mindset, proactive and solution-focused

Can explain technical decisions clearly

Commercial awareness and creative problem solving

Avoid:

Strong technically but poor communication

Purely task-focused, non-proactive contractors

Contract & Logistics

Length: 6 months (potential to extend or perm conversion)

Rate: £575/day (Outside IR35)

Start: ASAP

Remote UK/EU (Holborn optional)

About the Company

Harnham provides specialist Data and AI recruitment and staffing services, along with bespoke training solutions, across multiple industry verticals, operating in the UK, the USA and EU - contact us today to discuss your requirements: info@harnham.com Our recruitment and talent teams cover all aspects of the data and AI pipeline, from collection to consumption, across multiple data roles and functions. Whether you need full-time staff, contract talent, specialized training, Data-qualified graduates, or C-suite executives... Know more