Application & Systems Manager

About the role

We are looking for a manager to own that chain end to end. This is a hands-on leadership role, not a purely managerial one. You will lead a small team of developers, decide what gets built and in what order, write the specifications they work from, and review what comes back.

You will also be the person who can look at a production issue and say, with evidence, whether it lives in the application, the database, the network, or a vendor's platform.

Our systems have grown organically alongside a fast-growing business. They work, they carry real revenue, and they carry real technical debt. Bringing version control, a proper test-and-release path, and documented change control to a team that has been shipping without them is part of the mandate. If that prospect reads as interesting rather than alarming, we would like to talk to you.

Key responsibilities

• Know the business flow end to end — from stock leaving the warehouse to revenue posting in SAP
• Hold a single prioritised backlog across all systems, and defend that order to business stakeholders
• Answer questions with data you queried yourself, not with estimates
• Write clear PRDs: objective, scope, user stories with acceptance criteria, business rules, worked examples, test scenarios, edge cases, open questions, and implementation notes
• Set priorities and a definition of done that can actually be verified
• Review code and test evidence before anything reaches production
• Coach your developers so the team gets stronger — rather than absorbing all the hard work yourself
• Introduce version control and a UAT-to-production release path the team genuinely uses
• Require before/after evidence, rollback scripts, and approval for any change touching live data
• Triage incidents across application, database, network, and third-party services, and isolate the real cause with evidence

About you

• 5+ years building web or business systems, including 2+ years as a team lead or engineering manager
• Strong PHP/Laravel and SQL — good enough to read someone else's long query and find the fault in it
• Experience with systems where real money moves, and an instinct for why change control matters
• Working understanding of an ERP with inventory and accounts receivable — SAP Business One strongly preferred, comparable ERP experience considered
• Ability to write specifications a developer can act on without a follow-up meeting
• Enough infrastructure, networking, and security knowledge to troubleshoot and to hold vendors to account
• Professional Thai and English, sufficient for specifications and vendor management

Nice to have

• SAP Business One technical experience (DI API, Service Layer, or SQLScript on HANA)
• Background in POS, van sale, field sales, or multi-branch retail
• Experience introducing Git workflow or CI/CD to a team that had neither
• Bank or payment-gateway reconciliation experience
• Familiarity with PDPA and access control over customer data