Internship at the National Land Agency for Purbalingga Regency (January 2018)
Conducted land parcel data validation using GeoKKP to ensure data accuracy and consistency. Assisted in land surveying activities using GPS-RTK and Total Station instruments to support cadastral mapping and land administration processes.
Surveyor (Assistant Research) Pusat Pengembangan Infrastruktur Data Tata Ruang UGM (October 2021)
Performed photogrammetric surveys using Pix4D and Agisoft Metashape for mapping activities in Trimulyo Village, Bantul Regency. Surveyed village facilities and infrastructure using Mobile Topographer to produce village imagery, land cover, and infrastructure maps for spatial planning purposes.
Internship at Sleman Regency National Land Agency (December 2021 January 2022)
Validated Surat Ukur documents and carried out daily parcel plotting using AutoCAD and GeoKKP. Managed the validation of approximately 200 government-owned land parcels in Sarihardjo Village, Ngaglik District, and participated in land surveys using GPS-RTK and Total Station equipment.
Hazardous Waste Flows Modeller CV. Zahra Zelin (February 2022)
Developed numerical simulations of hazardous waste flow from hospital tanks using deterministic scenarios and FEFLOW software. Produced animation visualizations and environmental risk maps to identify potentially affected areas from waste contamination.
Cadastral Surveyor KJSB Anugerah Satria Pradana Budiyono dan Rekan (June July 2022)
Mapped, drew, and validated land parcels categorized as K1, K3, and K4 in Lebuawu Village, Jepara using GPS-RTK and AutoCAD Map. Contributed to cadastral surveying activities to support land registration and parcel verification processes.
Tsunami Simulator Tutor (July 2022 October 2023)
Presented tsunami modeling principles and software workflows, including earthquake source generation, DEM processing, tsunami ETA calculations, layouting, and data analysis using JAGURS, Matlab, and GMT. Assisted students in completing thesis projects related to tsunami simulation and disaster mitigation studies.
Topographic Surveyor PT Jelajah Survei Konsultan (September October 2022)
Conducted topographic surveys within a dam project area at the former PT Kelian Equatorial Mining quarry using Total Station and Surpac software. Supported spatial data collection and mapping for engineering and mining project development.
Data Processor (Assistant Research) (December 2022)
Processed DEM extraction from SPOT imagery and RBI contour maps using PCI Geomatica for tsunami threat numerical simulations. Contributed to a disaster risk management research project focused on resilient tourism and fisheries areas in the Sangihe Islands Regency.
Hydrographic Surveyor PT Samudera Atlantis International (7 November 2022 6 February 2023)
Worked as an online surveyor and navigator using Single Beam Echosounder and RTK methods for weekly dredging monitoring operations. Processed bathymetric survey data using Hypack and Civil3D to calculate dredged volumes through cut-and-fill analysis. Also processed orthophotos using Agisoft Metashape to monitor dredger positions and prepared technical survey reports for PT Wijaya Karya (Persero) Tbk.
Cadastral Surveyor PT Frasta Survey Indonesia (10 February 5 March 2023)
Conducted cadastral surveys in Kebrengan Village, Wonosobo, achieving measurements of 3082 land parcels per day. Drew parcel data using AutoCAD Map, performed stake-out activities for land subdivision, and measured GCP premarks using RTK methods for photogrammetric mapping support.
Surveyor PT Geo Survey Persada Indonesia (7 April 2 June 2023)
Planned, measured, processed, and reported Ground Control Point (GCP) data across an approximately 23,000-hectare project site using static GNSS methods. Coordinated survey concepts and field activities with government representatives and local communities.
Surveyor & Data Processor PT Aerotek Global Inovasi (10 15 June 2023)
Planned and conducted GCP surveys using RTK-NTRIP methods and performed quality control of RGB and multispectral orthophotos using Agisoft Metashape to ensure spatial data accuracy.
Surveyor PT Mahakarya Geo Survey (Metinaro Campaign Survey, 6 July 4 September 2023)
Performed topographic, bathymetric, benchmark, and geotechnical surveys in Timor Leste for TIMOR GAP, E.P. Surveyed various features including rivers, electrical infrastructure, coastlines, and boreholes using GNSS RTK, Total Station, QINSy, and Single Beam Echosounder. Processed leveling data using least squares adjustment and prepared technical survey reports.
Surveyor PT Mahakarya Geo Survey (Geophysical Services, 28 September 5 November 2023)
Worked as an online surveyor and navigator for offshore geophysical surveys in Madura using Single Beam and Multi Beam Echosounders, Side Scan Sonar, Pinger, Sparker, Magnetometer, and QINSy systems. Supported offshore platform planning projects for Petronas-Offshore Work Indonesia and prepared operational survey reports.
Map Quality Control Quadrant Global Pte. Ltd. (1 February 31 December 2023)
Ensured the accuracy and quality of POI data from multiple countries including Indonesia, Malaysia, USA, Philippines, Vietnam, China, and India using Google Maps, company websites, and spreadsheets. Conducted house number interpolation using satellite imagery, Google Street View, Jupyter, and QGIS while maintaining an overall accuracy rate of 97%. Also presented SOP refreshment sessions for vendors.
Surveyor PT Kapuas Prima Coal, Tbk (4 January 2024 11 February 2025)
Performed weekly underground mine tunnel updates using Total Station, Surpac, and ArcGIS. Conducted stake-out activities for drilling and blasting directions, calculated tunnel progress and stockpile volumes, and prepared monthly mine progress reports. Coordinated survey planning and cross-divisional operational activities to support mining productivity.
AI Data Annotator Zhipu AI (15 February 25 August 2025)
Annotated and labeled multimodal datasets from platforms such as Amazon, BBC, Google, Booking, Hugging Face, and GitHub following project-specific guidelines. Collaborated closely with coordinators and team members to maintain annotation consistency and achieved quality standards above 96% while meeting project deadlines.
AI Trainer Invisible Technology (2 August 2025 24 April 2026)
Developed culturally appropriate prompts and high-difficulty task sets to evaluate frontier AI model performance across multiple use cases. Conducted comparative evaluations of generative AI systems, including personalization-focused assessments between Gemini Flash and ChatGPT 5. Worked on personalization features utilizing data from conversations, Gmail, Google Search, and YouTube activity to improve AI response relevance. Additionally, produced detailed image captions, supervised SFT data collection projects for vision-language models, and evaluated responses using structured rubrics for nuanced and culturally sensitive scenarios.
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