Partner

Sinead Haysom

sinead.haysom@arbor.law Connect on LinkedIn →

ABOUT

Introduction

Sinead is a senior commercial employment solicitor who comes to Arbor from Mishcon de Reya’s market leading employment practice. She advises employers across the full employment lifecycle, from hiring through to exit. She works with blue-chip businesses, financial service businesses and multinationals, but has a growing focus on start-up and scale-up clients. Her undergraduate degree in Computer Science and Business Studies gives her a natural affinity for tech-led businesses and the specific employment challenges their founders and HR teams face.

Her approach is practical and cost-conscious. She turns matters around quickly, monitors costs closely and focuses on resolving issues efficiently, with the majority of her clients settling disputes before reaching tribunal.

Sinead works closely with M&A, commercial, incentives and intellectual property specialists to offer joined-up support across employment-related matters.

Sinead also advises individual executives and founders on the employment law aspects of their appointments and exits.

Behind the lawyer

Sinead spends her time between Malta and the UK. When she isn’t working she enjoys spending time with her young family, going to the beach, playing padel and painting watercolours.

Education

University of Warwick

BSc Computer and Business Studies (Upper Second), 2012

University of Law

Graduate Diploma in Law (Distinction), 2014

University of Law

Legal Practice Course (Distinction), 2015

Previous roles

Mishcon de Reya LLP

Managing Associate - September 2024 to September 2026

London Law Collective

Senior Associate - March 2021 to September 2024

Kemp Little LLP (Deloitte Legal)

Associate - September 2018 to January 2021

Trowers & Hamlins LLP

Solicitor - September 2017 to August 2018

Gowling WLG LLP

Trainee Solicitor - September 2015 to September 2017

Services

Employment Law Advising employers on all aspects of employment law across the employment lifecycle, including exits and settlement negotiations, discrimination, misconduct investigations, redundancy, TUPE, sickness absence and day-to-day…

Legal specialties

Employment for Start-Ups and Scale-Ups Advising founders and fast-growth businesses, particularly in the technology sector, on building their employment and HR frameworks, engaging contractors and managing the legal risks that come with rapid growth.
Executive and Founder Advisory Advising individual executives and founders on appointments, exits, settlement negotiations and C-suite employment matters.
Exits, Settlement Negotiations and Unfair Dismissal Advising on sensitive and high-profile exits, including director and C-suite level departures, and negotiating settlement agreements. Defending unfair dismissal claims both threatened and actual.
Discrimination and Sexual Harassment Advising employer clients on discrimination and sexual harassment matters, including the duty to prevent sexual harassment, investigations and client training.
IR35 and Contractor Engagement Advising on the tax and employment law implications of contractor engagement, including IR35 status assessments, off-payroll working rules and contract reviews.
TUPE and Restructuring Advising on TUPE transfers, outsourcing, insourcing and offshoring exercises, collective and cross-border redundancies, and TUPE indemnities within commercial agreements.
Employment Tribunal Handling employment tribunal claims including whistleblowing, discrimination, unfair dismissal and complex multi-issue cases.

Highly skilled pragmatic professionals who supplement in-house teams with specialist knowledge and industry know-how.

Legal 500

It is handy that if I know I need expertise, Arbor Law have it - they are so well rounded. It is a really efficient team.

Chambers & Partners (2026)

Highly skilled pragmatic professionals who supplement in-house teams with specialist knowledge and industry know-how.

Legal 500 (2026)

The team are fantastic - they are highly efficient, commercial and collaborative. They are genuinely customer-focused and care about the client's needs. They consider the big picture and are by far the best value for money of all my external supports.

Legal 500

Arbor balances legal expertise with practicality, helping to better adapt and react to any situation.

Legal 500 (2026)

Arbor balances legal expertise with practicality, helping to better adapt and react to any situation.

Legal 500 (2026)

We are very confident they are able to handle whatever is necessary. They know the space and they have common sense.

Chambers & Partners (2026)

Speak to us