Sales Proposal Writer

Trilateral Research; City Of London; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A leading consultancy firm in London is seeking a Sales Proposal Writer to craft persuasive proposals for ethical AI and research solutions. The ideal candidate will have over 2 years of proposal writing experience, a degree in a relevant field, and exceptional communication skills. This hybrid position requires a candidate based in London, offering a competitive salary and career development opportunities.

Benefits

Competitive salary

Enhanced pension

Flexible working arrangements

Continuous career development

Qualifications

• 2+ years’ experience as a proposal writer, bid writer, or commercial copywriter.
• Proven success in sales proposal or bid writing within commercial, consultancy, or tech environments.
• Exceptional English verbal communication skills.

Responsibilities

• Lead and coordinate the creation of compelling, client‑tailored sales proposals.
• Translate complex ideas into clear, persuasive content.
• Collaborate across teams to gather insights and craft a strong, consistent voice.

Skills

Proposal writing

Client-facing communication

Technical translation

Microsoft Office Suite

Customer focus

Education

Bachelor's degree in Communications, Business, Marketing, or relevant discipline

Tools

CRM systems (e.g., Monday.com, Zoho Bigin)

Job description

Sales Proposal Writer

Location: London Area, UK (Hybrid – ability to work from our Central London office as required) | Type: Permanent | Start: Asap | Hours: Full-time | Salary: Commensurate with experience

We have an exciting opportunity for a Sales Proposal Writer to come onboard and support the growth of our commercial function.

You will play a pivotal role in crafting persuasive, client-focused sales proposals that demonstrate the value of our ethical AI, research, training and consultancy solutions. If you can envision tailoring compelling sales documentation that both resonates with commercial buyers and positions Trilateral Research as a trusted partner of Responsible AI, we would love to connect with you!

This is a hybrid position and attendance will be required occasionally to our Central London office. The successful candidate must be based in London, or within a reasonable commute.

Who we are

At Trilateral Research we build Responsible AI (RAI) products and deliver services that empower organisations to develop and deploy AI responsibly. Our products and services are grounded in over 15 years of pioneering research and methodological innovation. Our award‑winning solutions tackle the most complex, sensitive social issues facing our societies today, including child safeguarding, public health improvement and climate action.

What you will do

Key responsibilities include but not limited to:

• Lead and coordinate the creation of compelling, client‑tailored sales proposals, consistent with business objectives.
• Translate complex ideas from researchers, technical partners, and legal teams into clear, persuasive content.
• Collaborate across teams to gather insights and craft a strong, consistent voice in every proposal, aligned with brand and commercial strategy.
• Streamline proposal processes, manage timelines, centralise a library of reusable content, to ensure every submission meets the highest quality standards.
• Support sales and business development activities with capability statements, decks, and other materials.
• Monitor RFP portals, track market trends and emerging opportunities, and keep up to date on competitor messaging.

What you bring

Essential Requirements

• 2+ years’ experience as a proposal writer, bid writer, or commercial copywriter.
• Proven success in sales proposal or bid writing within commercial, consultancy, or tech environments.
• Bachelor’s degree in relevant discipline (e.g. Communications, Business, Marketing, or a relevant technical discipline).
• Exceptional English verbal communication skills with an ability to collaborate and influence across departments and disciplines.
• Excellent writing, editing, and proof‑reading skills tailored to persuasive, client‑facing documents.
• Familiarity with commercial sales cycles, client onboarding, and pre‑sales documentation.
• Evidence of understanding and translating technical ideas into accessible content; such as AI capabilities, machine learning solutions.
• Proven ability to manage multiple priorities, deadlines and adapt to evolving requirements and client needs.
• Customer‑focused and curious mindset with sensitivity to commercial tone and branding.
• High proficiency in Microsoft Office Suite and ability to learn new technologies.
• Interest in ethical innovation, cyber security and data protection, AI solutions.

Desirable Requirements

• Experience with CRM systems (e.g., Monday.com, Zoho Bigin).
• Experience with ethical AI, data protection, cyber security, or innovation consultancy work.
• Awareness of compliance and data protection considerations in sales proposals.
• Experience in technical, consultancy, or startup/scale‑up environments.
• Experience writing compelling technical proposals to (non‑technical) business audiences.
• Master’s degree in a relevant discipline to support role requirements.

What we offer

• Competitive salary & enhanced pension (based on service)
• Enhanced holiday entitlement increasing with tenure
• Company sick pay & family‑friendly leave
• Flexible & hybrid working arrangements
• Continuous career development

How to Apply

Application requirements

Please submit your CV and complete all application questions listed, to have your application considered. References will be required prior to appointment and candidates must be eligible to work in the country the role requires.

Timelines

Our hiring team will be continuously reviewing applications as they are submitted. We receive a high volume of applications, and we will only be able to progress applicants that meet all the essential requirements listed in this description.

Key Information

We are an equal opportunities employer and positively encourage applications from suitably qualified and eligible candidates, regardless of their age, sex, race, disability, sexual orientation, gender reassignment, religion or belief, marital/civil partnership status, or pregnancy and maternity.

At Trilateral Research, we value privacy and data protection rights. We have a longstanding data protection culture and promote robust ethical standards in data management and research ethics. Please read Recruitment Privacy Notice in relation to our recruitment activities before submitting your application to work with us.