At a Glance
- Tasks: Lead complex NetSuite customisation and integration, mentoring the development team.
- Company: William Smith Group 1832 Limited, implementing Oracle NetSuite as core ERP.
- Benefits: Pension scheme, life assurance, free parking, training, and career development.
- Other info: Hybrid role with a dynamic team and clear roadmap for growth.
- Why this job: Be a senior technical voice with genuine influence on long-term platform direction.
- Qualifications: 4+ years of NetSuite SuiteScript experience and strong integration skills.
William Smith Group 1832 Limited is implementing Oracle NetSuite as its core ERP platform (go-live 1 November 2026), with Celigo as the integration layer, with Phase 1 covering core back‑office functions, warehousing and distribution, and Phase 2 covering manufacturing functionality. The in‑house development team – two Senior Developers and a further developer with growing NetSuite skills – delivers day‑to‑day platform development.
This role exists to add senior technical depth and specialist breadth to that team: owning the architecture of complex and cross‑cutting work, leading on integrations, acting as design authority and technical reviewer, and accelerating the wider team’s capability through mentoring and code review. It is positioned as a senior individual contributor role, parallel to the IT Manager on the technical track, complementing rather than competing with the existing developers.
Key Responsibilities:
- Act as design authority for NetSuite customisation and integration: architectural decisions, technical standards, code review, design sign‑off on non‑trivial work.
- Lead the design and build of the most complex SuiteScript work (Map/Reduce at scale, performance‑critical Suitelets and RESTlets, advanced workflow logic) and act as escalation point for the team on technical problems.
- Own the integration architecture end‑to‑end: flow design patterns, error handling and recovery, monitoring strategy, onboarding of new endpoints, retirement of legacy integrations when required.
- Establish and maintain platform engineering disciplines: SuiteCloud Development Framework, source control, sandbox and release management, deployment pipelines, governance limit monitoring.
- Mentor and upskill the existing development team through pairing, structured knowledge transfer, code review and technical coaching.
- Partner with the IT Manager on platform roadmap, technical debt management and Phase 2 (manufacturing) technical design.
- Engage directly with business stakeholders on the most complex requirements; translate to technical design and supporting documentation.
- Contribute to third‑line support as escalation specialist for the most complex incidents.
Strongly preferred (tier 1)
- Substantial hands‑on NetSuite SuiteScript development experience (4+ years, all major script types, demonstrable production track record).
- Deep working experience of Celigo integrator.io – flow architecture, error handling at scale, complex transformations.
- Demonstrable design and architectural responsibility on a NetSuite implementation or estate – not solely build‑to‑spec experience.
- Strong NetSuite data model fluency: saved searches, custom records, scripted vs. workflow trade‑offs, governance and performance considerations.
- Experience operating as a senior individual contributor – code review, mentoring, technical decision‑making.
Acceptable with development plan (tier 2 – alternative entry routes)
- Senior integration architect background on comparable platforms (Boomi, MuleSoft, Workato) with NetSuite exposure and willingness to specialise in Celigo.
- NetSuite SuiteCloud Developer II or Administrator certification.
- CPQ tooling experience.
- Manufacturing ERP functionality exposure (inventory, work orders, BOMs) – relevant to Phase 2.
- Git‑based source control and CI/CD for NetSuite (Salto, Blue Yonder or equivalent tooling).
- SQL, Python or other scripting languages for tooling and data work.
- Manufacturing, distribution or food and beverage sector background.
- Experience with BI tooling (principally Phocas).
Personal Attributes
- Comfortable as senior technical voice without being the line manager – collaborative with both the IT Manager and the existing development team.
- Mentoring mindset; gets satisfaction from levelling up a team rather than hoarding the complex work.
- Pragmatic on engineering rigour – applies standards proportionately to the business context.
- Strong written and verbal communication with non‑technical stakeholders.
- Committed to the agreed on‑site working pattern
What the Role Offers
- Senior technical role on a newly implemented enterprise platform with a clear Phase 2 roadmap ahead.
- Genuine design authority and influence over the long‑term technical direction.
- Strong existing team to work with and develop, not a green‑field rebuild.
What we offer:
- Pension Scheme
- Life Assurance 6x Salary
- Free Parking
- Employee Assistance Programmes
- Training and career development
- Holiday Purchase Scheme
- Holiday Loyalty Reward Days
- Cycle to Work Scheme
- Tech scheme and Employee Discounts
Location: Barnard Castle, County Durham (hybrid – minimum 2 days on‑site per week)
Job Type: Full‑time, Permanent
Principal NetSuite Developer in Barnard Castle employer: William Smith Group 1832
William Smith Group 1832 Limited is an exceptional employer, offering a senior technical role in a dynamic environment where you can significantly influence the architecture of a newly implemented enterprise platform. With a strong focus on employee growth through mentoring and training, alongside a supportive work culture that values collaboration and innovation, this position provides a unique opportunity to develop your skills while enjoying benefits such as a pension scheme, life assurance, and flexible working arrangements in the picturesque setting of Barnard Castle.
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We think this is how you could land Principal NetSuite Developer in Barnard Castle
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We think you need these skills to ace Principal NetSuite Developer in Barnard Castle
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at William Smith Group 1832.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at William Smith Group 1832 and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
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How to prepare for a job interview at William Smith Group 1832
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If William Smith Group 1832 uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
