Senior Social Worker - MASH

This role is subject to a £2,500 welcome payment (£1,250 on appointment and £1,250 on successful completion of probation), plus retention payments of £3,000 per year for the first two years, increasing to £4,000 per year from year three.

Southwark's Multi-Agency Safeguarding Hub (MASH) is looking for a passionate and dedicated Senior Social Worker to join an exceptional team and help make a meaningful difference for children and families across Southwark. This is an opportunity to use your experience to identify risk, safeguard children, and support positive outcomes for families — all within a supportive, multi-agency environment that values collaboration and professional development.

As a Senior Social Worker within the MASH Team, you will manage a balanced caseload, undertake high-quality screening and assessment of referrals, and contribute to the learning and development of peers. You will work closely with partner agencies to share intelligence, analyse information from multiple sources, and present cases at Threshold Meetings, whilst providing advice and guidance to both families and professionals.

Key responsibilities include:

• Identifying and assessing risks, needs, and safeguarding concerns for children and families
• Conducting MASH intelligence checks with partner agencies and making recommendations regarding risk levels
• Analysing and triangulating information from multiple sources to inform decision-making
• Signposting and referring families to appropriate services and support networks
• Providing advice, guidance, and information to families and professionals

The role is based at Queens Road, Peckham, London SE15 2HP
, working 36 hours per week on a permanent basis.

About you

Southwark is looking for an experienced and committed social work professional who brings strong analytical skills and a genuine passion for improving outcomes for children and families. The successful candidate will thrive in a multi-agency environment and be committed to tackling inequality, injustice, and racism in everything they do. The ideal candidate will:

• Hold a recognised Social Work qualification (or equivalent)
• Be currently registered with Social Work England
• Have successfully completed the Assessed and Supported Year in Employment (ASYE)
• Have significant experience working within a MASH Team in the UK
• Demonstrate strong assessment and analytical skills
• Have knowledge of child development, parenting capacity, environmental factors, and risk and protective factors affecting children
• Have experience working with families in a diverse inner-London borough setting
• Possess excellent communication and relationship-building skills
• Demonstrate a collaborative and proactive approach to partnership working
• Show a commitment to improving outcomes for children and tackling inequality, injustice, and racism

Southwark Council is committed to building a diverse workforce that reflects the communities it serves. Through the Southwark Stands Together initiative, the council promotes equality, inclusion, and opportunity, and particularly welcomes applications from Black, Asian, and ethnically diverse communities. A Guaranteed Interview Scheme is available for candidates who meet the minimum requirements and are current or former members of the Armed Forces, care experienced, or disabled or living with a long-term health condition.

This post is subject to an Enhanced DBS check, including a Children's Barred List check.

About Southwark

We are thelargestlocal authority social landlord in London, managing 55,000 homes lived in by 40% of Southwark’s residents. We are home to over 18,300 businesses including iconic London venues and social enterprises and we have a young, diverse and growing population.

At Southwark we are committed to…