Addendum Tech Stack

Enterprise software development and IT outsourcing for financial services

IT Services and IT Consulting Los Angeles, California 51–200 employees Founded 2009 Privately Held

Addendum is a 51–200-person software development and IT outsourcing firm founded in 2009, headquartered in Los Angeles. The tech stack—Java, .NET, Python, GCP, BigQuery, Dataform, Oracle EBS, and enterprise data tools (Tableau, Looker, Power BI)—reveals a client base heavy in finance and banking. Current hiring is engineering-focused (18 of 24 active roles), skewed toward senior staff, and spanning eight countries (US, Germany, Spain, UK, Italy, Poland, India, Costa Rica), suggesting rapid scaling of delivery capacity for distributed client work.

Tech Stack 77 technologies

Core StackJava .NET Playwright Postman Jira Confluence BigQuery Python GitLab Tableau Looker Terraform Power BI Angular Jenkins Swagger GCP Dataform Dataflow Google Cloud Functions iOS Android TOGAF Nessus Microsoft Defender Oracle EBS BlackLine Spring Boot Gradle IntelliJ IDEA+47 more

What Addendum Is Building

◆Challenges

Optimizing reconciliation systems
Automating reconciliation processes
Gap between forecast and target
Migration activities
Platform optimization
Reducing manual reconciliation effort
Operational delays due to issues
Complex reconciliation challenges
Core functionality improvements
Banking transformation initiatives

▲Active Projects

Customizing intellimatch systems
Configuring auto-matching rules
Deploying static data setups
Crm and campaigns development
Migration activities
A/b testing initiative
Reconciliation workflow architecture
Banking transformation initiatives
Core functionality improvements
Creative social media applications

Hiring Activity

Accelerating25 roles · 25 in 30d

Department

Engineering

Sales

Marketing

Finance

Seniority

Senior

Mid

Junior

Manager

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About Addendum

Addendum provides software development, IT resource outsourcing, and consulting to mid-market and enterprise clients in fintech, banking, telecom, and government. Services span enterprise software delivery, augmented staffing, data strategy and BI, QA, and DevOps. The company operates from Los Angeles with distributed engineering teams across North America, Europe, and India. Active project work includes CRM development, banking transformation initiatives, reconciliation workflow architecture, and platform optimization—typical of financial services modernization engagements.

HeadquartersLos Angeles, California

Company Size51–200 employees

Founded2009

Hiring MarketsGermany, Spain, United Kingdom, Costa Rica, United States, Italy, India, Poland

Frequently Asked Questions

What tech stack does Addendum use for client projects?

Addendum's primary stack includes Java, .NET, Python, GCP (BigQuery, Dataform, Dataflow), Oracle EBS, and analytics tools (Tableau, Looker, Power BI). They also deploy Playwright, Postman, GitLab, Jenkins, Terraform, and iOS/Android for full-stack and mobile work.

What industries does Addendum serve?

Addendum primarily serves fintech, banking, telecom, and government sectors. Recent project work centers on banking transformation, reconciliation automation, CRM development, and data platform optimization for financial services clients.

How this profile is built

Addendum's technology stack, projects, and hiring signals are inferred from public hiring and company data — career pages, public listings, and company web presence — then clustered and de-duplicated. Figures are estimates that refresh over time. Read our full methodology →

This is not an official vendor or customer list. It is a technology-adoption signal inferred from public data, intended for B2B research.