diff --git a/participantes/samueljansem/README.md b/participantes/samueljansem/README.md
new file mode 100644
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+++ b/participantes/samueljansem/README.md
@@ -0,0 +1,13 @@
+# Submissão para Rinha de Backend, Segunda Edição: 2024/Q1 - Controle de Concorrência
+
+<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Microsoft_.NET_logo.svg/300px-Microsoft_.NET_logo.svg.png" alt="Logo .NET" width="200" height="auto">
+<img src="https://upload.wikimedia.org/wikipedia/commons/2/29/Postgresql_elephant.svg" alt="Logo PostgreSQL" width="200" height="auto">
+<img src="https://upload.wikimedia.org/wikipedia/commons/c/c5/Nginx_logo.svg" alt="logo nginx" width="400" height="auto">
+
+## Samuel Jansem / [@samueljazen](https://twitter.com/samueljazen)
+
+Submissão feita com:
+
+- `.NET (Native AOT)`
+- `PostgreSQL`
+- [Repositório API](https://github.com/samueljansem/rinha-backend-2024-q1-dotnet)
diff --git a/participantes/samueljansem/config/init.sql b/participantes/samueljansem/config/init.sql
new file mode 100644
index 000000000..04f160299
--- /dev/null
+++ b/participantes/samueljansem/config/init.sql
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+CREATE TABLE
+    "clientes" (
+        "id" INT PRIMARY KEY,
+        "saldo" INTEGER NOT NULL,
+        "limite" INTEGER NOT NULL
+    );
+
+CREATE UNLOGGED TABLE
+    "transacoes" (
+        "id" SERIAL PRIMARY KEY,
+        "valor" INTEGER NOT NULL,
+        "id_cliente" INTEGER NOT NULL,
+        "tipo" VARCHAR(1) NOT NULL,
+        "descricao" VARCHAR(10) NOT NULL,
+        "realizada_em" TIMESTAMP WITH TIME ZONE NOT NULL,
+        CONSTRAINT "fk_transacoes_id_cliente" FOREIGN KEY ("id_cliente") REFERENCES "clientes" ("id")
+    );
+
+ALTER TABLE "transacoes" SET (autovacuum_enabled = false);
+
+INSERT INTO
+    clientes (id, saldo, limite)
+VALUES
+    (1, 0, 100000),
+    (2, 0, 80000),
+    (3, 0, 1000000),
+    (4, 0, 10000000),
+    (5, 0, 500000);
+
+CREATE OR REPLACE PROCEDURE criar_transacao_e_atualizar_saldo(
+    id_cliente INTEGER,
+    valor INTEGER,
+    tipo VARCHAR(1),
+    descricao VARCHAR(10),
+    realizada_em TIMESTAMP WITH TIME ZONE,
+    INOUT saldo_atual INTEGER DEFAULT NULL,
+    INOUT limite_atual INTEGER DEFAULT NULL
+)
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    valor_absoluto INTEGER;
+BEGIN
+    valor_absoluto := valor;
+
+    IF tipo = 'd' THEN
+        valor := -valor;
+    END IF;
+
+    UPDATE clientes
+    SET saldo = saldo + valor
+    WHERE id = id_cliente AND (saldo + valor) >= -limite
+    RETURNING saldo, limite INTO saldo_atual, limite_atual;
+
+    INSERT INTO transacoes (valor, id_cliente, tipo, descricao, realizada_em)
+    VALUES (valor_absoluto, id_cliente, tipo, descricao, realizada_em);
+END;
+$$;
\ No newline at end of file
diff --git a/participantes/samueljansem/config/nginx.conf b/participantes/samueljansem/config/nginx.conf
new file mode 100644
index 000000000..917b6c9be
--- /dev/null
+++ b/participantes/samueljansem/config/nginx.conf
@@ -0,0 +1,22 @@
+events {
+    worker_connections 1000;
+}
+
+http {
+    access_log off;
+    gzip on;
+    http2 on;
+    
+    upstream api {
+        server api01:8080;
+        server api02:8080;
+    }
+
+    server {
+        listen 9999;
+        
+        location / {
+            proxy_pass http://api;
+        }
+    }
+}
diff --git a/participantes/samueljansem/config/postgres.conf b/participantes/samueljansem/config/postgres.conf
new file mode 100644
index 000000000..f32b11e1b
--- /dev/null
+++ b/participantes/samueljansem/config/postgres.conf
@@ -0,0 +1,20 @@
+listen_addresses = '*'
+max_connections = 500
+superuser_reserved_connections = 3
+unix_socket_directories = '/var/run/postgresql'
+shared_buffers = 512MB
+work_mem = 4MB
+maintenance_work_mem = 256MB
+effective_cache_size = 1GB
+wal_buffers = 64MB
+checkpoint_completion_target = 0.9
+random_page_cost = 4.0
+effective_io_concurrency = 10
+autovacuum = on
+log_statement = 'none'
+log_duration = off
+log_lock_waits = off
+log_error_verbosity = terse
+log_min_messages = panic
+log_min_error_statement = panic
+synchronous_commit=off
\ No newline at end of file
diff --git a/participantes/samueljansem/docker-compose.yml b/participantes/samueljansem/docker-compose.yml
new file mode 100644
index 000000000..fd50e1fe9
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+++ b/participantes/samueljansem/docker-compose.yml
@@ -0,0 +1,60 @@
+version: '3.8'
+
+services:
+  api01: &api
+    image: samueljansem/rinha-backend-2024-q1-dotnet:latest
+    hostname: api01
+    ports:
+      - '8081:8080'
+    depends_on:
+      - db
+    deploy:
+      resources:
+        limits:
+          cpus: '0.25'
+          memory: '20MB'
+
+  api02:
+    <<: *api
+    hostname: api02
+    ports:
+      - '8082:8080'
+
+  db:
+    image: postgres:latest
+    hostname: db
+    environment:
+      - POSTGRES_DB=rinha
+      - POSTGRES_USER=admin
+      - POSTGRES_PASSWORD=123
+    ports:
+      - '5432:5432'
+    volumes:
+      - ./config/init.sql:/docker-entrypoint-initdb.d/init.sql:ro
+      - ./config/postgres.conf:/docker-entrypoint-initdb.d/postgres.conf
+    command: postgres -c config_file=/docker-entrypoint-initdb.d/postgres.conf
+    deploy:
+      resources:
+        limits:
+          cpus: '0.8'
+          memory: '490MB'
+
+  nginx:
+    image: nginx:latest
+    ports:
+      - '9999:9999'
+    volumes:
+      - ./config/nginx.conf:/etc/nginx/nginx.conf:ro
+    depends_on:
+      - api01
+      - api02
+    deploy:
+      resources:
+        limits:
+          cpus: '0.2'
+          memory: '20MB'
+
+networks:
+  default:
+    driver: bridge
+    name: rinha-nginx-2024-q1-dotnet