# Flagstar Bank: Technology stack

Source: https://www.bankingnewsai.com/banks/flagstar/technology-stack
Last updated: Oct 16, 2026

*Part of the [Flagstar Bank AI strategy profile](https://www.bankingnewsai.com/banks/flagstar).*

## What technology stack does Flagstar Bank run?

Flagstar is replacing the separate stacks of three predecessor banks (Flagstar, New York Community Bank and Signature Bank) with one foundation it calls the Flagstar S2 Platform, launched in June 2026 and made up of 12 components. The first step was infrastructure: with Mphasis, six legacy data centres were consolidated into two colocation centres leased from Equinix in Ashburn, Virginia and the Chicago area, completed in the first quarter of 2026 without disruption and, Higgins says, in about a year rather than two to three. Each site can carry the full load, and workload moves in under 60 minutes against about eight hours before. The next step is the core: Fiserv's cloud-native, API-first Finxact was chosen from 12 candidates in August 2026 as the single system of record, with migrations in summer 2027 and 2028 and $40 million to $45 million of annual savings expected. StarIQ, the generative-AI layer, runs in an AWS tenant. Software expense rose 20% to $96 million in the first half of 2026 while total operating expense fell 10%. CTO Jason Pope says removing the batch window lets fraud decisions and AI work from one real-time version of the data. ([Flagstar Bank](https://ir.flagstar.com/news-and-events/news-releases/press-release-details/2026/FLAGSTAR-BANK-ANNOUNCES-PROPRIETARY-TECHNOLOGY-TRANSFORMATION/default.aspx), [American Banker](https://www.americanbanker.com/leaders/the-ai-enabled-bank-reimagining-retail-banking-from-branch-to-mobile), [PR Newswire via FT Markets](https://markets.ft.com/data/announce/detail?dockey=600-202603301417PR_NEWS_USPRX____NY22478-1), [American Banker](https://www.americanbanker.com/news/how-flagstar-bank-integrated-its-acquired-data-centers), [earnings call transcript (The Motley Fool)](https://www.fool.com/earnings/call-transcripts/2026/04/24/flagstar-flg-q1-2026-earnings-transcript/), [Banking Dive](https://www.bankingdive.com/news/flagstar-bank-fiserv-finxact-cloud-native-core-tech-modernization/828477/), [Investing.com](https://investing.com/news/company-news/flagstar-bank-selects-fiservs-finxact-as-core-banking-platform-93CH-4863110), [Flagstar Bank (SEC filings)](https://www.sec.gov/Archives/edgar/data/910073/000091007326000068/fbc-20260630.htm))

## Which platforms make up Flagstar's stack?

| Layer | What Flagstar uses | Detail | Date | Sources |
| --- | --- | --- | --- | --- |
| Data centres | Two Equinix colocation sites (Ashburn, VA; Chicago area) | Six legacy centres consolidated with Mphasis; run as peers; failover under 60 minutes | Q1 2026 | [American Banker](https://www.americanbanker.com/news/how-flagstar-bank-integrated-its-acquired-data-centers), [PR Newswire via FT Markets](https://markets.ft.com/data/announce/detail?dockey=600-202603301417PR_NEWS_USPRX____NY22478-1), [earnings call transcript (The Motley Fool)](https://www.fool.com/earnings/call-transcripts/2026/04/24/flagstar-flg-q1-2026-earnings-transcript/) |
| Core banking (today) | Two cores | Exiting one is worth about $40 million a year; target of one core | April 2026 | [Yahoo Finance](https://finance.yahoo.com/markets/stocks/articles/flagstar-flg-q1-2026-earnings-140646732.html), [earnings call transcript (The Motley Fool)](https://www.fool.com/earnings/call-transcripts/2026/04/24/flagstar-flg-q1-2026-earnings-transcript/) |
| Core banking (next) | Fiserv Finxact | Cloud-native, API-first, real-time; replaces end-of-day batch reconciliation; chosen from 12 candidates | Migrations summer 2027 and 2028 | [Investing.com](https://investing.com/news/company-news/flagstar-bank-selects-fiservs-finxact-as-core-banking-platform-93CH-4863110), [Fiserv (GlobeNewswire)](https://globenewswire.com/news-release/2026/08/17/3346102/0/en/fiserv-and-flagstar-bank-announce-strategic-core-banking-relationship.html), [Banking Dive](https://www.bankingdive.com/news/flagstar-bank-fiserv-finxact-cloud-native-core-tech-modernization/828477/) |
| Enterprise platform | Flagstar S2 Platform | 12 components; integrates customer data across deposits, lending, wealth and mortgage for a real-time Customer 360 | Launched June 2026 | [American Banker](https://www.americanbanker.com/leaders/the-ai-enabled-bank-reimagining-retail-banking-from-branch-to-mobile), [Zacks Equity Research (Yahoo Finance)](https://finance.yahoo.com/news/flagstar-banks-technology-expansion-step-143100464.html), [Flagstar Bank](https://ir.flagstar.com/news-and-events/news-releases/press-release-details/2026/FLAGSTAR-BANK-ANNOUNCES-PROPRIETARY-TECHNOLOGY-TRANSFORMATION/default.aspx) |
| Generative AI | StarIQ on AWS | Claude, Llama, Mistral, Titan; Palo Alto Prisma AI firewalls; RAG with citations | Early 2026 | [Flagstar Bank](https://ir.flagstar.com/news-and-events/news-releases/press-release-details/2026/FLAGSTAR-BANK-ANNOUNCES-PROPRIETARY-TECHNOLOGY-TRANSFORMATION/default.aspx) |
| Engineering capacity | Cognizant; eight outside firms on S2 | Co-branded development centres in Hyderabad and Manila | 2026 | [Cognizant (PR Newswire)](https://www.prnewswire.com/news-releases/cognizant-and-flagstar-bank-na-mark-one-year-partnership-advancing-flagstars-transformation-enhancing-client-experience-and-driving-efficiency-302674135.html), [American Banker](https://www.americanbanker.com/news/how-flagstar-bank-integrated-its-acquired-data-centers) |
| Operating model | Product operating model; site reliability engineering; cloud governance as code | Led by the March 2026 hires under CTO Jason Pope | March 2026 | [Flagstar Bank](https://ir.flagstar.com/news-and-events/news-releases/press-release-details/2026/FLAGSTAR-BANK-N-A--EXPANDS-TECHNOLOGY-LEADERSHIP-TEAM-ACCELERATING-THE-BANKS-TECHNOLOGY-ARCHITECTURE/default.aspx) |

## What does Flagstar's modernisation cost, and how fast is it moving?

Software expense was $96 million in the first half of 2026, up from $80 million a year earlier, which the second-quarter 10-Q attributes to 'ongoing infrastructure development and system enhancements'; total operating expense fell 10% to $868 million over the same period. ([Flagstar Bank (SEC filings)](https://www.sec.gov/Archives/edgar/data/910073/000091007326000068/fbc-20260630.htm))

CFO Lee Smith told investors in May 2026 that core consolidation should save $40 million to $45 million a year, with further savings from vendor reductions, real estate and IT projects coming online over the next 18 months, and an efficiency-ratio target of 50% to 55%. ([MarketBeat (Yahoo Finance)](https://finance.yahoo.com/markets/stocks/articles/flagstar-bank-touts-turnaround-progress-080618215.html))

Otting said on the Q1 2026 call that finishing the data-centre consolidation 'positions us well in 2027 to have the baseline and platform for our core conversion with ultimately the goal in 2027 to get onto one core'; the Fiserv announcement later set migrations in summer 2027 and 2028. ([earnings call transcript (The Motley Fool)](https://www.fool.com/earnings/call-transcripts/2026/04/24/flagstar-flg-q1-2026-earnings-transcript/), [Banking Dive](https://www.bankingdive.com/news/flagstar-bank-fiserv-finxact-cloud-native-core-tech-modernization/828477/))

Higgins frames it as 'a business transformation that's enabled through technology and data', and Pope says a real-time system of record with 'a single, authoritative version of that truth' changes everything downstream, including fraud decisions and AI. ([Banking Dive](https://www.bankingdive.com/news/flagstar-bank-fiserv-finxact-cloud-native-core-tech-modernization/828477/))

## What does the Flagstar profile record on this topic?

| Date | Move | Detail | Sources |
| --- | --- | --- | --- |
| Aug 17, 2026 | Fiserv announces Finxact as the bank's core | Fiserv's release calls Finxact the system of record and transaction engine of S2, with phased conversions; the platform processes in real time and removes end-of-day batch reconciliation. | [Fiserv (GlobeNewswire)](https://globenewswire.com/news-release/2026/08/17/3346102/0/en/fiserv-and-flagstar-bank-announce-strategic-core-banking-relationship.html) |
| Aug 17, 2026 | Fiserv's Finxact chosen as the single core | Two migrations, summer 2027 and 2028; $40–45 million of annual savings expected. | [Banking Dive](https://www.bankingdive.com/news/flagstar-bank-fiserv-finxact-cloud-native-core-tech-modernization/828477/) |
| Aug 6, 2026 | Q2 2026 10-Q: software expense $49 million; Figure stake sold; still no AI language | Software expense rose to $49 million for the quarter and $96 million for the half, attributed to infrastructure development and system enhancements. The bank sold its whole stake in Figure Technology Solutions for $46 million. The filing does not mention artificial intelligence. | [Flagstar Bank (SEC filings)](https://www.sec.gov/Archives/edgar/data/910073/000091007326000068/fbc-20260630.htm) |
| Jun 30, 2026 | Two new data centres run as peers; eight outside firms on S2 | Higgins told American Banker the Ashburn, Virginia and Chicago-area sites, leased from Equinix, can each carry the full load, with workload moved in under 60 minutes against about eight hours for the old primary-to-secondary move and validation; Mphasis is one of eight companies working on S2. | [American Banker](https://www.americanbanker.com/news/how-flagstar-bank-integrated-its-acquired-data-centers) |
| Jun 30, 2026 | Six data centres consolidated in a year | How three acquired stacks became one; S2 officially launched in June. | [American Banker](https://www.americanbanker.com/news/how-flagstar-bank-integrated-its-acquired-data-centers) |
| May 7, 2026 | Q1 2026 10-Q: no AI language; software expense up 12% | Software expense was $47 million, up 12% on a year earlier. The filing does not mention artificial intelligence. | [Flagstar Bank (SEC filings)](https://www.sec.gov/Archives/edgar/data/910073/000091007326000047/fbc-20260331.htm) |
| Apr 24, 2026 | Q1 2026 call: six data centres into two | Consolidation into two colocation centres completed in the quarter without disruption; the bank runs two cores today and aims to exit one, worth roughly $40 million a year, on the way to a single core in 2027. | [Yahoo Finance](https://finance.yahoo.com/markets/stocks/articles/flagstar-flg-q1-2026-earnings-140646732.html) |
| Mar 30, 2026 | First phase of infrastructure modernisation complete | With Mphasis: a next-generation data centre and cloud platform. | [PR Newswire via FT Markets](https://markets.ft.com/data/announce/detail?dockey=600-202603301417PR_NEWS_USPRX____NY22478-1) |

## Common questions

### What is the Flagstar S2 Platform?

S2, for 'Simple and Sophisticated', is Flagstar's enterprise technology platform replacing the systems of three predecessor banks. It launched in June 2026 with 12 components, including the StarIQ AI system, and the bank has applied to trademark the name.

### What core banking system will Flagstar use?

Fiserv's Finxact, a cloud-native, API-first core chosen from 12 candidates and announced on August 17, 2026. It will replace the bank's two current cores in migrations planned for summer 2027 and 2028, with $40 million to $45 million of annual savings expected.

### How many data centres does Flagstar run?

Two, down from six. The consolidation, done with Mphasis and completed in the first quarter of 2026, moved workloads into Equinix colocation sites in Ashburn, Virginia and the Chicago area, each able to carry the full load.

### How much is Flagstar spending on technology?

Software expense was $96 million in the first half of 2026, up 20% year on year, according to the second-quarter 10-Q. In 2025 Otting budgeted $70 million to $80 million for technology and $30 million to $40 million for AML software and customer privacy.
## Deeper on Flagstar

- [What is Flagstar Bank's AI strategy?](https://www.bankingnewsai.com/banks/flagstar/ai-strategy)
- [What AI patents and partnerships does Flagstar Bank have?](https://www.bankingnewsai.com/banks/flagstar/ai-research-patents-partnerships)
- [How does Flagstar govern its use of AI?](https://www.bankingnewsai.com/banks/flagstar/responsible-ai)


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