diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
deleted file mode 100644
index 7ed2347..0000000
--- a/.github/workflows/lint.yml
+++ /dev/null
@@ -1,53 +0,0 @@
-name: Lint
-
-on:
-  push:
-    branches:
-      - "*"
-  pull_request:
-    branches:
-      - main
-
-permissions:
-   contents: read  # to fetch code (actions/checkout)
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
-  cancel-in-progress: true
-
-jobs:
-  test_lint:
-    name: Lint
-    # If using act to run CI locally the github object does not exist and the usual skipping should not be enforced
-    if: "github.repository == 'numpy/numpy-financial' || github.repository == ''"
-    runs-on: ubuntu-22.04
-    strategy:
-      matrix:
-        python-version: ['3.11']
-
-    steps:
-    - uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        submodules: recursive
-
-    - name: Setup Python
-      uses: actions/setup-python@v4
-      with:
-        python-version: ${{ matrix.python-version }}
-
-    - name: Install Python packages
-      run: |
-        python -m pip install --upgrade pip poetry
-        poetry env use ${{ matrix.python-version }}
-        poetry install --with=lint
-
-    - name: Lint with Ruff
-      run: |
-        set -euo pipefail
-        # Tell us what version we are using
-        poetry run ruff version
-        # Check the source file, ignore type annotations (ANN) for now.
-        poetry run ruff check numpy_financial/ --ignore F403 --select E,F,B,I
-        # Check the test and benchmark files
-        poetry run ruff check tests/ benchmarks/ --select E,F,B,I
diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index e5b576c..2812b50 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -1,10 +1,13 @@
-name: Python package
+name: Test package
 
 on: [push, pull_request]
 
 jobs:
   build:
     runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash -el {0}
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
@@ -12,14 +15,27 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: conda-incubator/setup-miniconda@v3
       with:
+        auto-update-conda: true
         python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
+        activate-environment: numpy-financial-dev
+        environment-file: environment.yml
+        auto-activate-base: false
+    - name: Conda metadata
       run: |
-        python -m pip install --upgrade pip poetry
-        poetry env use ${{ matrix.python-version }}
-        poetry install --with=test
+        conda info
+        conda list
+    - name: Lint
+      run: |
+        set -euo pipefail
+        # Tell us what version we are using
+        ruff version
+        # Check the source file, ignore type annotations (ANN) for now.
+        ruff check numpy_financial/ benchmarks/ --ignore F403 --select E,F,B,I
+    - name: Build project
+      run: |
+        spin build -v
     - name: Test with pytest
       run: |
-        poetry run pytest --doctest-modules
+        spin test -- --doctest-modules
diff --git a/.gitignore b/.gitignore
index 8b3cdae..f495f60 100644
--- a/.gitignore
+++ b/.gitignore
@@ -62,6 +62,7 @@ GTAGS
 ################
 # setup.py working directory
 build
+build-install
 # sphinx build directory
 _build
 # setup.py dist directory
@@ -112,3 +113,7 @@ poetry.lock
 # Things specific to this project #
 ###################################
 doc/source/_api_stubs
+
+# Misc files that we do not require #
+.asv/
+.hypothesis/
diff --git a/environment.yml b/environment.yml
new file mode 100644
index 0000000..921cec8
--- /dev/null
+++ b/environment.yml
@@ -0,0 +1,31 @@
+# To use:
+#   $ conda env create -f environment.yml  # `mamba` works too for this command
+#   $ conda activate numpy-financial-dev
+#
+name: numpy-financial-dev
+channels:
+  - conda-forge
+dependencies:
+  # Runtime dependencies
+  - python
+  - numpy
+  # Build
+  - cython>=3.0.9
+  - compilers
+  - meson
+  - meson-python
+  - ninja
+  # Tests
+  - pytest
+  - pytest-xdist
+  - asv>=0.6.0
+  - hypothesis
+  # Docs
+  - myst-parser
+  - numpydoc
+  - pydata-sphinx-theme>=0.15.0
+  - spin
+  # Lint
+  - ruff>=0.3.0
+  # Benchmarks
+  - asv>=0.6.0
diff --git a/meson.build b/meson.build
new file mode 100644
index 0000000..cb6a213
--- /dev/null
+++ b/meson.build
@@ -0,0 +1,19 @@
+project(
+    'numpy-financial',
+    'cython', 'c',
+    version: '2.0.0.dev',
+    license: 'BSD-3',
+    meson_version: '>=1.4.0',
+)
+
+cc = meson.get_compiler('c')
+cy = meson.get_compiler('cython')
+
+if not cy.version().version_compare('>=3.0.9')
+  error('NumPy-Financial requires Cython >= 3.0.9')
+endif
+
+py = import('python').find_installation(pure: false)
+py_dep = py.dependency()
+
+subdir('numpy_financial')
diff --git a/numpy_financial/_cfinancial.pyx b/numpy_financial/_cfinancial.pyx
new file mode 100644
index 0000000..77c195b
--- /dev/null
+++ b/numpy_financial/_cfinancial.pyx
@@ -0,0 +1,21 @@
+from libc.math cimport NAN
+cimport cython
+
+@cython.boundscheck(False)
+@cython.cdivision(True)
+def npv(const double[::1] rates, const double[:, ::1] values, double[:, ::1] out):
+    cdef:
+        Py_ssize_t i, j, t
+        double acc
+
+    with nogil:
+        for i in range(rates.shape[0]):
+            for j in range(values.shape[0]):
+                acc = 0.0
+                for t in range(values.shape[1]):
+                    if rates[i] == -1.0:
+                        acc = NAN
+                        break
+                    else:
+                        acc = acc + values[j, t] / ((1.0 + rates[i]) ** t)
+                out[i, j] = acc
\ No newline at end of file
diff --git a/numpy_financial/_financial.py b/numpy_financial/_financial.py
index 534230f..03f3f1b 100644
--- a/numpy_financial/_financial.py
+++ b/numpy_financial/_financial.py
@@ -13,9 +13,10 @@
 
 from decimal import Decimal
 
-import numba as nb
 import numpy as np
 
+from . import _cfinancial
+
 __all__ = ['fv', 'pmt', 'nper', 'ipmt', 'ppmt', 'pv', 'rate',
            'irr', 'npv', 'mirr',
            'NoRealSolutionError', 'IterationsExceededError']
@@ -844,20 +845,6 @@ def irr(values, *, raise_exceptions=False):
     return eirr[np.argmin(abs_eirr)]
 
 
-@nb.njit
-def _npv_native(rates, values, out):
-    for i in range(rates.shape[0]):
-        for j in range(values.shape[0]):
-            acc = 0.0
-            for t in range(values.shape[1]):
-                if rates[i] == -1.0:
-                    acc = np.nan
-                    break
-                else:
-                    acc += values[j, t] / ((1.0 + rates[i]) ** t)
-            out[i, j] = acc
-
-
 def npv(rate, values):
     r"""Return the NPV (Net Present Value) of a cash flow series.
 
@@ -935,8 +922,8 @@ def npv(rate, values):
            [-2798.19, -3612.24],
            [-2884.3 , -3710.74]])
     """
-    values_inner = np.atleast_2d(values)
-    rate_inner = np.atleast_1d(rate)
+    values_inner = np.atleast_2d(values).astype(np.float64)
+    rate_inner = np.atleast_1d(rate).astype(np.float64)
 
     if rate_inner.ndim != 1:
         msg = "invalid shape for rates. Rate must be either a scalar or 1d array"
@@ -948,7 +935,7 @@ def npv(rate, values):
 
     output_shape = _get_output_array_shape(rate_inner, values_inner)
     out = np.empty(output_shape)
-    _npv_native(rate_inner, values_inner, out)
+    _cfinancial.npv(rate_inner, values_inner, out)
     return _ufunc_like(out)
 
 
diff --git a/numpy_financial/meson.build b/numpy_financial/meson.build
new file mode 100644
index 0000000..6fe3ce5
--- /dev/null
+++ b/numpy_financial/meson.build
@@ -0,0 +1,18 @@
+py.extension_module(
+    '_cfinancial',
+    '_cfinancial.pyx',
+    install: true,
+    subdir: 'numpy_financial',
+)
+
+python_sources = [
+    '__init__.py',
+    '_financial.py',
+]
+
+py.install_sources(
+    python_sources,
+    subdir: 'numpy_financial',
+)
+
+install_subdir('tests', install_dir: py.get_install_dir() / 'numpy_financial')
diff --git a/tests/test_financial.py b/numpy_financial/tests/test_financial.py
similarity index 100%
rename from tests/test_financial.py
rename to numpy_financial/tests/test_financial.py
diff --git a/pyproject.toml b/pyproject.toml
index 517910f..d1cfc52 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,11 +1,15 @@
 [build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"
-
+build-backend = "mesonpy"
+requires = [
+    "meson-python>=0.15.0",
+    "Cython>=3.0.9",
+    "numpy>=1.23.5",
+]
 
-[tool.poetry]
+[project]
 name = "numpy-financial"
 version = "2.0.0"
+requires-python = ">=3.10"
 description = "Simple financial functions"
 license = "BSD-3-Clause"
 authors = ["Travis E. Oliphant et al."]
@@ -34,30 +38,41 @@ classifiers = [
     "Operating System :: Unix",
     "Operating System :: MacOS",
 ]
-packages = [{include = "numpy_financial"}]
-
-[tool.poetry.dependencies]
-python = "^3.10"
-numpy = "^1.23"
-numba = "^0.59.1"
-
-[tool.poetry.group.test.dependencies]
-pytest = "^8.0"
-hypothesis = {extras = ["numpy"], version = "^6.99.11"}
-pytest-xdist = {extras = ["psutil"], version = "^3.5.0"}
-
-
-[tool.poetry.group.docs.dependencies]
-sphinx = "^7.0"
-numpydoc = "^1.5"
-pydata-sphinx-theme = "^0.15"
-myst-parser = "^2.0.0"
-
 
+[project.optional-dependencies]
+test = [
+    "pytest",
+    "pytest-xdist",
+    "hypothesis",
+]
+doc = [
+    "sphinx>=7.0",
+    "numpydoc>=1.5",
+    "pydata-sphinx-theme>=0.15",
+    "myst-parser>=2.0.0",
+]
+dev = [
+    "ruff>=0.3.0",
+    "asv>=0.6.0",
+]
 
-[tool.poetry.group.lint.dependencies]
-ruff = "^0.3"
 
+[tool.spin]
+package = 'numpy_financial'
 
-[tool.poetry.group.bench.dependencies]
-asv = "^0.6"
+[tool.spin.commands]
+"Build" = [
+  "spin.cmds.meson.build",
+  "spin.cmds.meson.test",
+  "spin.cmds.build.sdist",
+  "spin.cmds.pip.install",
+]
+"Documentation" = [
+  "spin.cmds.meson.docs"
+]
+"Environments" = [
+  "spin.cmds.meson.shell",
+  "spin.cmds.meson.ipython",
+  "spin.cmds.meson.python",
+  "spin.cmds.meson.run"
+]
diff --git a/tests/__init__.py b/tests/__init__.py
deleted file mode 100644
index e69de29..0000000