Available to hire
I’m David Bachmann, a professional full stack software developer and bridge-builder between vision and technology. With 15+ years of freelance experience, I design and deliver web-based business applications using Microsoft tooling like .NET (C#) and Visual Studio, and front-end frameworks such as Angular, jQuery, HTML, and CSS. I enjoy turning complex requirements into clean, scalable solutions and I’m passionate about coaching and sharing knowledge with teams to make ideas production-ready.
I’m a mechanical engineer by training (B.Sc.) and have lived in Denmark and Israel. I value synergy, focus on results, and I’m comfortable working remotely with screen sharing and voice calls. I can attend meetings across Europe and the USA, and I offer work with EU-friendly hours and local phone support. My approach combines engineering rigor with pragmatic delivery to solve real business problems and mentor others along the way.
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Language
English
Fluent
Hebrew (modern)
Fluent
Danish
Fluent
German
Beginner
Yiddish
Intermediate
Swedish
Beginner
Norwegian
Beginner
Work Experience
Software Developer at Public Sales Period
January 1, 2022 - September 11, 2025Delivered an online platform to order daily goods for neighborhood delivery points, integrating with a MySQL-based backend and providing Excel export of orders.
Software Engineer / Full-Stack Developer at Zilber Assessments Ltd.
January 1, 2020 - PresentBuilt an online assessment platform with a RTL/Hebrew front end, integrated OpenAI API for result evaluation, and implemented credit card charging.
Developer at Zilber Assessments Ltd.
January 1, 2020 - PresentConverted and extended a PHP-based online assessment platform to .NET MVC; integrated OpenAI API usage for evaluation; implemented RTL/Hebrew UI and payment integration.
Freelance Software Developer at Zilber Assessments Ltd.
January 1, 2020 - PresentModernized an online assessment platform by converting from PHP to .NET MVC C#, RTL Hebrew UI, and integrating OpenAI; implemented an admin module and payment integration.
Software Engineer at Zilber Assessments Ltd.
January 1, 2020 - PresentBuilt an online assessment platform RTL/Hebrew UI; integrated OpenAI API for result evaluation and payments.
Freelance Full Stack Developer at Zilber Assessments Ltd.
January 1, 2020 - PresentLed a full conversion/remake of a PHP-based assessment platform to .NET MVC with RTL front-end using Bootstrap. Implemented admin enhancements, integrated credit card processing, and added OpenAI API integration to evaluate results. Delivered RTL Hebrew admin UI and background services as part of ongoing platform modernization.
Freelance Software Developer at Aroutzim – Direct Marketing Channels Ltd.
January 1, 2018 - PresentConverted the public website from Classic ASP to a new CMS using ASP.NET MVC C#, HTML, jQuery, Bootstrap, and MSSQL. Built an admin CMS to manage exhibitors, signup, parking, mass mailing with reply tracking, and additional features; developed a ticketing system with PDF tickets and QR codes for entry.
Software Engineer at Aroutzim – Direct Marketing Channels Ltd.
January 1, 2018 - PresentConverted public site to a new CMS; built ticketing, CRM, mass mailing, event management; integrated QR code tickets and backend for multiple interfaces.
Freelance Full Stack Developer at Aroutzim – Direct Marketing Channels Ltd.
January 1, 2018 - PresentConverted their public website from classic ASP to a new CMS using ASP.NET MVC C#, HTML, jQuery, and Bootstrap with an MSSQL database. Built a comprehensive CMS to plan and control exhibition and conference operations (exhibitors, signups, parking, mass mailings with tracking). Implemented a ticketing system delivering PDF tickets by email, with unique QR codes for on-site printing. Developed an online exhibit module (who sells what) for professionals, with statistics and follow-up workflows. Migrated the CRM from Access forms to a modern Angular frontend while preserving the existing backend business logic, enabling unified rules across web and Windows apps. Integrated mail and SMS APIs (SendGrid, Gmail, etc.) and enabled real-time updates via SignalR.
Developer at Charity Online
December 31, 2017 - September 11, 2025See above entry; further contributions to MVC-based platform for fundraising events and donor management.
Software Developer at TASHBAR
December 31, 2017 - September 11, 2025Rolled out software for youth activities management, including participant registration, member cards with barcodes, activity tracking, and results/reporting; delivered a system with integrated data capture and reporting.
Developer at Charity Online
December 31, 2017 - September 11, 2025UK-based nonprofit platform for event fundraising; implemented MVC-based web application features for event management, donor tracking, and fundraising analytics; worked with RTL/Hebrew considerations where needed.
Software Developer at TASHBAR
January 1, 2017 - September 11, 2025Built a software solution from scratch to manage participant registrations, print plastic member cards with barcodes, track activities, results, earned points, and prize redemption.
TASHBAR at TASHBAR
January 1, 2017 - September 11, 2025Built software to register participants, issue member cards with barcodes, track activities and points redeemable for prizes.
Charity Online at CHARITY ONLINE
January 1, 2017 - September 11, 2025UK-based nonprofit platform with event fundraising, dashboards and donor statistics.
Software Developer at TASHBAR
January 1, 2017 - September 11, 2025Built from scratch a software system to register participants, print plastic member cards with barcodes, track activities, exams, points, and prize redemptions.
Software Developer at TASHBAR
January 1, 2017 - September 11, 2025Built a software system to register participants, print member cards with barcodes, track activities and prize points.
Software Developer at TASHBAR
January 1, 2017 - September 11, 2025Built a database-driven system from scratch to register participants, print plastic membership cards with barcodes, manage activities, record exam results, and track points for prize redemption.
Developer at SAP Israel – SAP Community Network
December 31, 2016 - September 11, 2025Overhauled an existing classic ASP-based portal; migrated and extended functionality to .NET, implemented article pipelines, statistics, and user management tasks for SAP’s developer community portal.
Contributor / Developer at SAP Israel – SAP Community Network
January 1, 2016 - September 11, 2025Converted and enhanced the classic ASP SAP developer portal to .NET, added features, and implemented service programs with SSO integration; contributed to dynamic questionnaire generation and reporting.
Software Developer / Portal Developer at SAP Israel / NEW-APP (Portal Division)
January 1, 2016 - September 11, 2025Converted classic ASP to .NET; added features and ad hoc service programs; integrated with SSO (NetWeaver/SAML); created admin CMS, dynamic questionnaires, and enhanced web services.
Software Developer at SAP – SAP Community Network
January 1, 2016 - September 11, 2025Converted classic ASP to .NET; added service programs and statistics, integrated with SSO (NetWeaver/SAML) and built pipelines for article publication.
Portal / Article Platform Specialist at SAP Israel – SAP Community Network (Portal Division)
January 1, 2016 - September 11, 2025Converted article portals from Classic ASP to .NET, added features and ad hoc services; integrated with SSO (NetWeaver, SAML).
Portal Developer / SAP Community Network Lead at SAP Community Network (Portal Division) – Raanana, Israel
January 1, 2016 - September 11, 2025Converted a classic ASP application to .NET, implemented automatic article publication workflow, and added service programs for statistics and data processing. Integrated with SAP SSO (NetWeaver/SAML) and built a dynamic questionnaire generator based on open-source components.
Developer / Consultant at Servio A/S
December 31, 2015 - September 11, 2025Maintained and extended an accounting-adjacent application for film industry travel expenses; integrated with Navision/Microsoft Dynamics; added mobile photo capture of invoices and cloud-based upload flow.
Software Developer at Servio A/S – Ishøj, Denmark
January 1, 2015 - September 11, 2025Maintained an application enabling film industry travel expenses reporting, integrated with Navision/Microsoft Dynamics; added mobile invoice photo capture and instant upload.
Servio A/S at Ishøj, Denmark
January 1, 2015 - September 11, 2025Accountants software for travel expenses; integrated with Navision/Microsoft Dynamics; added mobile invoice photo upload.
Software Developer at Servio A/S
January 1, 2015 - September 11, 2025Maintained an application for travel expense reporting for the film industry and integrated it with Navision. Added features such as photographing invoices via smartphone and uploading; streamlined processes.
Software Developer at Servio A/S
January 1, 2015 - September 11, 2025Maintained an expenses workflow app for the film industry, integrating with Navision; added smartphone photo capture for invoices.
Software Developer at Servio A/S
January 1, 2015 - September 11, 2025Maintained an expenses application for an accounting firm, integrating it with Navision (Microsoft Dynamics). Enhanced usability by enabling photo capture of invoices via smartphone and direct uploading for processing.
Software Developer at SUPERFOSS DENMARK
December 31, 2014 - September 11, 2025Developed an online CO2 calculator for product data, incorporating parameters such as distance, packaging, and product type; implemented client-side and server-side components to support accurate environmental impact computations.
Software Developer at SUPERFOSS DENMARK
January 1, 2014 - September 11, 2025Created an online CO2 calculator incorporating distance, product type, and packaging to compute the carbon footprint of orders.
SUPERFOSS Denmark at SUPERFOSS Denmark
January 1, 2014 - September 11, 2025Online CO2 calculator to estimate CO2 footprint for ordering products, considering distance, packaging, etc.
Software Developer at SUPERFOSS Denmark
January 1, 2014 - September 11, 2025Developed an online CO2 calculator to estimate carbon footprint based on transport, packaging, and product parameters.
Software Engineer at SUPERFOSS Denmark
January 1, 2014 - September 11, 2025Developed an online CO2 calculator to evaluate emissions based on product choices and logistics.
Developer at SUPERFOSS DENMARK
January 1, 2014 - September 11, 2025Created an online CO2 calculator to estimate carbon footprint from product choices, considering distance, packaging, and product type.
Lead Developer / Team Lead at IDEX ONLINE DIAMOND EXCHANGE
December 31, 2011 - September 11, 2025Led a development team building and maintaining one of the world’s largest online diamond exchanges; implemented stock listings, integration with external stock software, custom CMS, ticketing, and reporting components with a focus on robust business rules and scalable architecture.
Lead Developer / Team Lead at IDEX ONLINE DIAMOND EXCHANGE
January 1, 2011 - September 11, 2025Led a team of developers building one of the world’s largest online diamond exchanges. Implemented an advanced price-list model, integrated with stock software, built a CMS for articles and partner services, and delivered data integration and reporting capabilities.
Software Developer at IDEX ONLINE DIAMOND EXCHANGE
January 1, 2011 - September 11, 2025Led development of one of the world’s largest online diamond exchanges; built stock display, price modeling, CMS, and data exchange integrations.
Lead Developer / Team Lead at IDEX ONLINE DIAMOND EXCHANGE
January 1, 2011 - September 11, 2025Led a development team for a large online diamond exchange; implemented stock export/import integrations, pricing model, CMS, and multiple back-end services; established unified business rules across frontends.
Software Developer / Team Lead at IDEX ONLINE DIAMOND EXCHANGE
January 1, 2011 - September 11, 2025Led the development of one of the world's largest online diamond exchanges, building a system with stock integration, price modeling, CMS, exhibitor management, ticketing, and online statistics. Managed a development team and created REST services to connect external stock software.
Lead Developer / Platform Lead at IDEX ONLINE DIAMOND EXCHANGE
January 1, 2011 - September 11, 2025Helped build and maintain one of the world’s largest online diamond exchanges. Implemented an advanced pricing model, integrated with stock software for exports/imports, built a CMS for articles, and created reporting features. Exposed core functionality via REST-style endpoints and connected multiple frontends (web and internal tools) to a unified business logic layer. Led a small dev team, including offshore resources, to deliver features and data integrations.
IT Instructor at Multiple providers (Teknologisk Institutt, Erfa, Uni-C, IDG)
January 1, 2000 - September 11, 2025Taught professional programming courses, developed curricula and learning materials, and contributed to course planning and delivery for top IT companies and government agencies.
Web Development & Team Leader at 21st.dk, Copenhagen, Denmark
January 1, 2000 - September 11, 2025Built and led the web development department, delivering e-commerce and CMS applications with reusable components for multiple clients; later sold the company to T-Systems.
Software Developer / Lead Developer at Microsoft Israel/NEW-APP
January 1, 2000 - PresentDeveloped and extended a platform for exhibition organizers (Chance2Meet/Speed Biz Dating). Built E-poster applications and a poster-size exhibition screen. Implemented back-end services and front-end interfaces, with integration to Outlook and Google Calendar, event ticketing, QR ticketing, and exhibitor management.
21st.dk at 21st.dk, Copenhagen, Denmark
January 1, 2000 - September 11, 2025WEB Development & Team Leader; built and led internet applications department; ecommerce and CMS solutions; project growth.
Software Developer at Microsoft Israel / NEW-APP
January 1, 2000 - PresentWorked on Microsoft Israel initiatives, contributing to event platforms and related web/services with RTL/Hebrew considerations.
IT Instructor at Various leading course providers in Israel and Denmark
January 1, 2000 - September 11, 2025Taught professional programming courses for leading providers in Israel and Denmark.
Software Developer at Microsoft Israel / NEW-APP
January 1, 2000 - PresentOngoing development and support services for exhibition-related tools; integration with external services and enhancement of backend processes.
Software Developer / Contractor at Microsoft Israel / NEW-APP
January 1, 2000 - PresentProvided software development services for Microsoft Israel/NEW-APP; contributed to web-based and backend solutions, including integration work and service-oriented components. Involved in converting and extending business logic for multiple exhibition-related tools.
Web Development & Team Leader at 21st.dk
January 1, 2000 - September 11, 2025Built up the Internet (Web) applications department from scratch; developed e-commerce and CMS solutions, trained the programming team, and created reusable core applications for multiple clients. Led development of ecommerce and CMS platforms (classic ASP to .NET) and supported a shift to modern web technologies.
IT Instructor at Various Danish IT course providers (Teknologisk Institut, Erfa, Uni-C, IDG)
January 1, 2000 - September 11, 2025Taught professional programming courses; planned curricula and materials; delivered instruction across multiple providers, including Jerusalem-based training for Ultra-Orthodox programmers.
Web Developer / Team Leader at 21st.dk
January 1, 2000 - September 11, 2025Established the internet applications department; built e-commerce and CMS systems; created reusable core applications. The company was later sold to T-Systems.
Software Developer at Microsoft Israel/NEW-APP
January 1, 2000 - PresentWorked on early Microsoft Israel projects; contributed to exhibition solutions and integrated single sign-on approaches; helped deliver e-poster features for trade shows.
IT Instructor at Various Danish course providers ( Teknologisk Institut, Erfa, Uni-C, IDG)
January 1, 2000 - September 11, 2025Instructed professional programming courses; contributed to syllabi and learning materials; taught in Jerusalem in 2010 for Ultra-Orthodox programmers.
Web Developer / Team Leader at 21st.dk
January 1, 2000 - September 11, 2025Built the internet applications department from scratch; developed e-commerce and CMS using Classic ASP, MSSQL, JavaScript; company later sold to t-systems.
Software Architect / Lead Developer at Microsoft Israel / NEW-APP / Chance2Meet
January 1, 2000 - PresentDeveloped event matchmaking and e-poster platform for Microsoft Israel; implemented admin portals, SSO integration and poster screen; the project later evolved into a startup; contributed to webforms/.NET and client-side UI.
Web Development & Team Leader at 21st.dk
January 1, 2000 - September 11, 2025Built the Internet applications department from scratch, delivering e-commerce and CMS solutions reusable for clients; later acquired by t-systems.
IT Instructor at Various Danish and Israeli Providers
January 1, 2000 - September 11, 2025Taught professional programming courses for leading providers (Technological Institute, Erfa, Uni-C, IDG) and contributed to course planning and learning materials. In 2010, taught a course for Ultra-Orthodox programmers in Jerusalem.
Software Developer at Microsoft Israel/NEW-APP
January 1, 2000 - PresentWorked on an exhibition platform for Microsoft Israel, including E-poster functionality and other exhibition-related features. Collaborated closely with Microsoft Israel as an approved software supplier.
Education
B.Sc. in Mechanical Engineering at DTU (Danmarks Tekniske Universitet)
January 11, 2030 - January 1, 1992B.Sc. in Mechanical Engineering at Ben-Gurion University of the Negev
January 11, 2030 - January 1, 1992B.Sc. Mechanical Engineering at DTU (Technical University of Denmark)
January 11, 2030 - January 1, 1992B.Sc. Mechanical Engineering at Ben-Gurion University of the Negev
January 11, 2030 - September 11, 2025B.Sc. in Mechanical Engineering at DTU (Technical University of Denmark)
January 11, 2030 - January 1, 1992B.Sc. in Mechanical Engineering at Ben Gurion University of the Negev
January 11, 2030 - January 1, 1992B.Sc. in Mechanical Engineering at DTU (Technical University of Denmark)
January 11, 2030 - January 1, 1992B.Sc. in Mechanical Engineering at The Ben Gurion University of the Negev
January 11, 2030 - January 1, 1992Bachelor of Science in Mechanical Engineering at DTU
January 11, 2030 - January 1, 1992Bachelor of Science in Mechanical Engineering at The Ben Gurion University of the Negev
January 11, 2030 - January 1, 1992B.Sc. in Mechanical Engineering at DTU
January 11, 2030 - January 1, 1992B.Sc. in Mechanical Engineering at The Ben Gurion University of the Negev
January 11, 2030 - January 1, 1992Qualifications
B.Sc. in Mechanical Engineering
January 11, 2030 - January 1, 1992Industry Experience
Software & Internet, Professional Services, Media & Entertainment, Non-Profit Organization, Education, Retail
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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