Ester Widjaja
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Ester Widjaja Email & Phone Number

Business and Operation Lead at GreenA Consultants
Location: Singapore, Singapore, Singapore 5 work roles 3 schools
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✓ Verified Jun 2026 3 data sources Profile completeness 86%

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Current company
GreenA Consultants
Role
Business and Operation Lead
Location
Singapore, Singapore, Singapore
Company size
35 employees

Who is Ester Widjaja? Overview

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Quick answer

Ester Widjaja is listed as Business and Operation Lead at GreenA Consultants, a company with 35 employees, based in Singapore, Singapore, Singapore. AeroLeads shows a matched LinkedIn profile for Ester Widjaja.

Ester Widjaja previously worked as Business Sustainability Analyst at Greena Consultants and Senior Quantity Surveyor at Hexacon Construction. Ester Widjaja holds Advanced Certificates, Driving Sustainability For The Future: The Future Of Work Through A Sustainable Lens from Singapore Management University.

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Email format at GreenA Consultants

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GreenA Consultants

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Profile bio

About Ester Widjaja

With over 12 years of work experiences, I have developed strong competencies in project and contract and management. I have successfully delivered multiple projects, ranging from residential to commercial developments with quality, efficiency, and compliance.Excellent stakeholder management and communication, with meticulous attention to details. Strong analytical and problem-solving skills. I partnered with various stakeholders, such as clients, contractors, consultants, and suppliers, to administer contracts, assess and mitigate risks, plan and coordinate resources. Foundational understanding of key corporate sustainability concepts, standards, guidelines, frameworks, ESG reporting, sustainable finance, climate mapping, carbon, and environmental systems, which I enhanced by completing an advanced course from the Singapore Management University (Advanced Certificate in Driving Sustainability for The Future). I have applied my knowledge and skills to ensure green building practices and social responsibility in all aspects of the project lifecycle. I am fluent in English, Mandarin, Indonesia, Malay, and Hokkian.

Current workplace

Ester Widjaja's current company

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GreenA Consultants
Greena Consultants
Business and Operation Lead
Singapore
Website
greenaconsultants.com
Employees
35
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Company profile
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5 roles

Ester Widjaja work experience

A career timeline built from the work history available for this profile.

Senior Quantity Surveyor

Hexacon Construction

Singapore

  • Projects: Paya Lebar Quarter - PLQ (14th Storey Office Tower 1& 2, and 13th Storey Office @Tower 3)  IOI Towers at Central Blvd (48th Storey Office & 16th Storey Office)
  • Oversaw the entire lifecycle of contracts, from initiation and negotiation to execution and closeout.
  • Drafted, reviewed, and negotiated contracts, ensuring compliance with legal and regulatory requirements.
  • Checked and evaluated the reliability of documents submitted by subcontractors and suppliers to guarantee compliance, green building practices & materials, and social responsibility in all aspects of the project.
  • Monitored and ensure compliance with contractual obligations by all parties involved.
  • Managed relationships with vendors and suppliers, including negotiating and resolving issues that may arise during the contract lifecycle.
Nov 2016 - Feb 2022

Senior Cost Controller

Daewoo Engineering & Construction Co.,Ltd.

Singapore

  • Project: D’nest condominium @ Pasir Ris (912 units)
  • Involved in BCA - Productivity Innovation Project (PIP) incentive scheme for technology adoption and innovations (Precast Bathroom Unit - PBU) that improve productivity at construction sites. Successfully claim for SGD.
  • Worked closely with clients to determine their requirements and needs.
  • Planned, estimated, and managed cost
  • Assessed and evaluated the terms and conditions outlined in the contract
  • Estimated the costs of materials and labour required for the project
Apr 2014 - Nov 2016

Quantity Surveyor

Shimizu Corporation

Singapore

  • Projects: Fusionopolis at Buana Vista  Tokio Marine Tower at Mccalum Street (21st storey office tower)  268 Orchard Road (12th storey commercial building)
  • Reviewed construction plans and drawings and prepared quantity requirements.
  • Liaised with site managers, sub-contractors, and suppliers.
  • Prepared tender, contracts, and payment for approval.
  • Measured and valued the work done on site
Aug 2008 - Apr 2014
Team & coworkers

Colleagues at GreenA Consultants

Other employees you can reach at greenaconsultants.com. View company contacts for 35 employees →

AR Alfiyya Riska Indrianti Alfiyya Riska Indrianti Colleague at Greena ConsultantsJakarta, Indonesia, Indonesia View → GC Greena Consultants Greena Consultants Colleague at Greena ConsultantsSingapore, Singapore View → EE Elizabeth Eapen Elizabeth Eapen Colleague at Greena ConsultantsSingapore, Singapore View → CP Christian Paskah Wilmar Christian Paskah Wilmar Colleague at Greena ConsultantsNorth Kalimantan, Indonesia, Indonesia View → NC Nguyen Chinh Nguyen Chinh Colleague at Greena ConsultantsVietnam, Viet Nam View → FT Fred Tan Zi-Shen Fred Tan Zi-Shen Colleague at Greena ConsultantsSingapore, Singapore View → IM Innocent Mhandu Innocent Mhandu Colleague at Greena ConsultantsZimbabwe, Zimbabwe View → AN Afiqah Noriman Afiqah Noriman Colleague at Greena ConsultantsSingapore, Singapore, Singapore View → AW Ayundita Winayu Putri Ayundita Winayu Putri Colleague at Greena ConsultantsIndonesia, Indonesia View → WA Wanodyaning Aqila Ma'Rifah Salsabila Wanodyaning Aqila Ma'Rifah Salsabila Colleague at Greena ConsultantsIndonesia, Indonesia View →
3 education records

Ester Widjaja education

Diploma, Construction Management

Imperia Institute Of Technology
FAQ

Frequently asked questions about Ester Widjaja

Quick answers generated from the profile data available on this page.

What company does Ester Widjaja work for?

Ester Widjaja works for GreenA Consultants.

What is Ester Widjaja's role at GreenA Consultants?

Ester Widjaja is listed as Business and Operation Lead at GreenA Consultants.

Where is Ester Widjaja based?

Ester Widjaja is based in Singapore, Singapore, Singapore while working with GreenA Consultants.

What companies has Ester Widjaja worked for?

Ester Widjaja has worked for Greena Consultants, Hexacon Construction, Daewoo Engineering & Construction Co.,Ltd., and Shimizu Corporation.

Who are Ester Widjaja's colleagues at GreenA Consultants?

Ester Widjaja's colleagues at GreenA Consultants include Alfiyya Riska Indrianti, Greena Consultants, Elizabeth Eapen, Christian Paskah Wilmar, and Nguyen Chinh.

How can I contact Ester Widjaja?

You can use AeroLeads to view verified contact signals for Ester Widjaja at GreenA Consultants, including work email, phone, and LinkedIn data when available.

What schools did Ester Widjaja attend?

Ester Widjaja holds Advanced Certificates, Driving Sustainability For The Future: The Future Of Work Through A Sustainable Lens from Singapore Management University.

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