Senior Business Analyst (fixed-term contract)

Who We Are

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 at the region's leading companies and conglomerates. We are also a member firm of Andersen Consulting, a global consulting practice integrating business strategy, digital transformation, and AI-driven technology solutions with Andersen Global's world-class expertise.

What We Do

Sertis provides both productized and bespoke AI and Data solutions for our Customers, optimizing and commercializing their data in ways that activate real business results. Our 140+ team have developed product offerings and IP ranging from advanced Computer Vision applications accredited Global Top 20 by NIST, to automated insights monetization for Retailers, eKYC for financial institutions, AI-driven agricultural safety assurance, precision steel cutting, trading algorithms for hedge funds, and enterprise knowledge management systems based on AI.

About the Role

We are looking for a Senior Business Analyst with an account-facing mindset to serve as a key bridge between clients and internal teams. This role goes beyond traditional BA work — you will own client relationships, proactively manage accounts, and drive end-to-end delivery of features and solutions from requirements through to go-live. If you thrive in both technical conversations and client-facing environments, this role is for you.

This role is based at our client's site in the Nonthaburi area, requiring 3-4 days on-site.

Responsibilities

Account Management

• Serve as the primary point of contact for assigned client accounts, building and maintaining strong, long-term relationships
• Proactively engage clients to understand evolving business needs, surface opportunities, and manage expectations throughout the project and product lifecycle
• Lead regular client check-ins, status updates, and review meetings to ensure alignment and satisfaction
• Identify and escalate risks, issues, or change requests early, working with internal stakeholders to resolve them efficiently
• Support account growth by understanding client goals and connecting them with the right solutions

Business Analysis

• Lead requirement-gathering sessions with clients when new features or system enhancements are requested, ensuring needs are clearly captured, scoped, and prioritized
• 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, ensuring delivered solutions genuinely 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 in collaboration with clients and technical teams
• Track, document, and manage defects and issues through to resolution during testing phases
• 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
• Experience acting as a client or account contact, managing relationships, expectations, and communications independently
• Strong analytical and problem-solving skills with attention to detail
• Excellent communication skills, able to translate between technical and non-technical stakeholders confidently
• Experience in retail, convenience store, or consumer-facing business environments is a strong plus
• Good communication skills in English and Thai Native