Account Manager

Antithesis Operations LLC; Greater London; On-site; GBP 60,000 - 80,000; Full time

Job summary

Antithesis Operations LLC is seeking an experienced Account Manager in Greater London. This role involves owning customer relationships post-sale, driving renewals and expansion, and managing a defined book of business. Candidates must have over 5 years of experience in a quota-carrying role at a B2B SaaS company, with a proven record of retention and growth. The position offers the opportunity to work closely with technical customers and drive significant revenue outcomes.

Qualifications

• 5+ years experience in a quota-carrying Account Manager role.
• Experience at a B2B SaaS company.
• Proven record of meeting or exceeding ARR retention and growth targets.

Responsibilities

• Own a book of business from initial handoff through adoption, renewal, and expansion.
• Drive on-time renewals with clear forecasting.
• Identify and scope expansion opportunities.

Skills

Quota-carrying experience

Customer relationship management

Forecasting discipline

Negotiation skills

Technical understanding

Job description

About the role

Antithesis is hiring Account Managers to own customer relationships after close.

You will be joining a growing global team of talented Account managers, reporting to the Head of Customer Growth, partnering and working closely with Sales, Customer Experience, and Product.

You help shape how post-sales account management works at Antithesis.

You take responsibility for renewals and expansion from day one.

You work with deeply technical customers: Engineers and Engineering Leaders, CTOs and CEOs.

This is a quota-carrying role. You own revenue outcomes.

What you will do:

• Own a book of business from initial handoff through onboarding, adoption, renewal, and expansion

• Carry a quota tied to renewals and expansion

• Drive on-time renewals with clear forecasting

• Identify, scope, and close expansion opportunities

• Build trusted relationships with customers

• Help guide customers through onboarding, adoption, and value realization

• Lead post-sale commercial conversations

• Own renewal terms, pricing, and expansion proposals

• Partner with Customer Success and Customer Experience

• Surface product feedback grounded in customer usage

• Track account health, risk, and growth signals

• Contribute to renewal and expansion playbooks

• Operate with ownership in an early-stage environment

What success looks like:

• Strong gross and net retention

• Predictable renewal forecasting

• Expansion driven by real customer value

• Long-term customer relationships

• Clear ownership and follow-through

• No surprise churn through early risk identification and proactive ownership

Requirements:

• 5+ years experience in a quota-carrying Account Manager role

• Experience at a B2B SaaS company

• Direct ownership of renewal and expansion quotas

• Proven record of meeting or exceeding ARR retention and growth targets

• Experience managing a defined book of business

• Experience running renewal and expansion deal cycles

• Comfort owning pricing, terms, and commercial negotiations

• Experience selling to existing customers, not prospects

• Ability to work with technical buyers and stakeholders

• Strong forecasting discipline and pipeline management

• Comfort operating in a fast-moving startup

Strongly preferred

• Experience with highly technical products, developer tools or infrastructure products

• Experience working with engineering-led customers

• Experience with usage-based or platform SaaS

This role is not

• A Customer Success role without quota

• A support or relationship-only role

• A training role for first-time sellers