Senior Business Analyst (fixed-term contract)

About the Company

Located in the heart of Bangkok’s Phrom Phong District, Sertis is ASEAN's leading Data and AI engineering and solutions company. Since 2014, our advanced solutions and products have powered over 400 enterprise Data and AI deployments across the region. We are a member firm of Andersen Consulting, integrating business strategy, digital transformation, and AI-driven technology solutions. For more information, please visit: sertiscorp.com

About The Job

We are looking for a Senior Business Analyst with an account-facing mindset to serve as a key bridge between clients and internal teams. You will own client relationships, proactively manage accounts, and drive end-to-end delivery of features and solutions from requirements through to go-live. This role is based at our client's site in the Nonthaburi area, requiring 3-4 days WIO.

Responsibilities

• Account Management — Serve as the primary point of contact for assigned client accounts; build and maintain strong, long-term relationships; proactively engage clients to understand evolving business needs, surface opportunities, and manage expectations; lead regular client check-ins, status updates, and review meetings; identify and escalate risks, issues, or change requests early and work with internal stakeholders to resolve them; support account growth by understanding client goals and connecting them with the right solutions.
• Business Analysis — Lead requirement-gathering sessions for new features or system enhancements; translate complex business requirements into detailed functional specifications, process flows, use cases, and solution proposals for the development team; act as the voice of the client internally to ensure delivered solutions address business needs; participate in and contribute to projects following SDLC or Agile methodologies; plan, coordinate, and lead System Integration Testing (SIT) and User Acceptance Testing (UAT) with clients and internal QA teams; define test scenarios and acceptance criteria; track, document, and manage defects through to resolution; ensure smooth project go-live by coordinating cutover activities, training, and post-launch support.

Qualifications

• Bachelor's or Master's degree in Computer Science, Computer Engineering, Information Technology, Business Information Systems, or a related field.
• At least 3–4 years of experience as a Business Analyst, Account Executive, or a combined role with a track record of managing client-facing delivery.
• Hands-on experience leading UAT and SIT cycles, including test planning, defect tracking, and sign-off coordination.
• Proven ability to gather, document, and manage requirements for software development or system implementation projects.
• Solid understanding of SDLC and/or Agile methodologies and experience acting as a client or account contact to manage relationships and communications independently.
• Strong analytical and problem-solving skills with attention to detail; excellent communication skills to translate between technical and non-technical stakeholders.
• Experience in retail, convenience store, or consumer-facing business environments is a strong plus.
• Good communication skills in English and Thai Native.

Additional Information

Fixed-term contract. Hybrid work arrangement; this role requires 3–4 days WIO at the client's site in Nonthaburi. Sertis may collect, use, or disclose personal data provided by you during the recruitment process; for more information, refer to our Recruitment Privacy Notice.