Post Creative Strategist (Social Media Manager)

Serotonin; Manchester; On-site; GBP 26,000 - 30,000; Full time

Job summary

A fast-growing creative agency in Manchester is looking for a Social Strategist to drive social media strategies for multiple clients. The role requires cultivating community engagement and crafting dynamic content. Candidates should have 2+ years in a social-first position with expertise in platforms like TikTok and Instagram. The agency offers competitive salary and various perks including health insurance and flexible working hours.

Benefits

Private health insurance

14 day 'Work From Anywhere' policy

Flexible start-end times

Free breakfast and snacks

Regular team socials

Qualifications

• 2+ years in a similar social-first role.
• Experience with TikTok, Instagram, YouTube Shorts.
• Ability to craft content calendars and write copy.

Responsibilities

• Own the social strategy for multiple clients.
• Produce insights and content calendars.
• Engage with followers and manage influencer outreach.

Skills

Social media strategy

Community engagement

Content creation

Trend analysis

Client communication

Tools

Canva

CapCut

Adobe Suite

Job description

Overview

Serotonin is a performance-driven creative agency built for ambitious consumer brands.

We’ve worked with brands like ASSOS of Switzerland, Rudy's, British Cycling, New & Lingwood, Riverstone Living and many more. We believe good creative is what gets you noticed; performance is what keeps you growing. We do both. We’re growing fast, moving fast, and need leaders who can think big and roll their sleeves up.

The Role — a social-obsessed creative-thinker who lives online and knows how to turn community insights into scroll-stopping work. This isn’t just a content scheduling job. It’s about thinking and moving like a creator. You’ll be in-platform every day, spotting trends, building community, fuelling influencer campaigns, and pitching ideas that feel more TikTok than TVC. You’ll collaborate across strategy, performance, content, and creative to build always-on social calendars that actually work - not just tick a box. If you thrive in a fast-paced agency, love turning real-time insight into reactive ideas, and believe brand isn’t what you say but what you post, then this could be your moment.

What You’ll Do

Content & Channel Strategy

• Own the social strategy for multiple clients - from daily TikToks to long-form content campaigns
• Build monthly content calendars backed by insight, trends, and creative thinking
• Produce copy and caption banks that sound more like the internet and less like a press release
• Work with our creative and production teams to brief, plan, and execute content days/shoots
• Analyse what works (and what flops) across platforms and feed it back into your thinking

Community, Culture & Trends

• Stay glued to the algorithm - know what’s blowing up, what’s getting binned, and why
• Run daily social listening and trend spotting sessions
• Engage with followers, reply to comments, and help brands sound human
• Manage influencer outreach, product seeding, and brand partnerships

Strategy & Client Thinking

• Bring the voice of the customer into every campaign
• Write decks, insights, and creative rationales that sell the idea and the outcome
• Support client reporting with performance breakdowns, trend commentary, and forward recommendations
• Be the go-to for social-first ideas that ladder up to business results

What You Bring

• 2+ years in a similar social-first role - whether at an agency, in-house, or freelancing
• A finger on the pulse of TikTok, Instagram, YouTube Shorts, and whatever’s next
• Experience crafting content calendars, writing copy, and planning influencer or brand campaigns
• An instinct for what makes good content - plus experience with basic tools like Canva, CapCut, or Adobe Suite
• Confidence in front of clients and collaborators - you can pitch ideas clearly and back them up with insight
• Comfortable working fast, flexibly, and cross-functionally
• Strong understanding of marketing principles, and how brand and performance can work together

The Package

• Private health insurance including mental health support
• Salary is £26-30k (depending on experience)
• 14 day "Work From Anywhere" policy
• Pet-friendly Manchester office
• Flexible start-end times
• Free breakfast and stocked snacks
• Regular team socials and wellness perks
• Opportunity to shape the agency and scale a high-performing campaign team
• A chance to lead at one of Manchester’s fastest-growing performance agencies