diff --git a/src/server/features/legislation/legislation.test.ts b/src/server/features/legislation/legislation.test.ts
new file mode 100644
index 0000000..a39d198
--- /dev/null
+++ b/src/server/features/legislation/legislation.test.ts
@@ -0,0 +1,97 @@
+import { beforeEach, describe, expect, it, vi } from "vitest"
+
+vi.mock("../../shared/db/client", () => {
+	const mockDb = {
+		select: vi.fn(),
+		insert: vi.fn(),
+		update: vi.fn(),
+	}
+	// chain builder pattern
+	const chain = (result: unknown) => ({
+		from: vi.fn().mockReturnValue({
+			where: vi.fn().mockReturnValue({
+				limit: vi.fn().mockResolvedValue(result),
+				innerJoin: vi.fn().mockReturnValue({
+					where: vi.fn().mockResolvedValue(result),
+				}),
+			}),
+			leftJoin: vi.fn().mockReturnValue({
+				orderBy: vi.fn().mockReturnValue({
+					limit: vi.fn().mockResolvedValue(result),
+				}),
+			}),
+		}),
+	})
+	mockDb.select.mockReturnValue(chain([]))
+	mockDb.insert.mockReturnValue({
+		values: vi.fn().mockReturnValue({
+			onConflictDoUpdate: vi.fn().mockResolvedValue(undefined),
+			returning: vi.fn().mockResolvedValue([{ id: 1 }]),
+		}),
+	})
+	return { db: mockDb }
+})
+
+const { getLegislation, castVote, getUserVote } = await import("./service")
+const { db } = await import("../../shared/db/client")
+
+describe("legislation service", () => {
+	beforeEach(() => {
+		vi.clearAllMocks()
+	})
+
+	describe("getLegislation", () => {
+		it("returns null when legislation not found", async () => {
+			const result = await getLegislation(999)
+			expect(result).toBeNull()
+			expect(db.select).toHaveBeenCalled()
+		})
+	})
+
+	describe("castVote", () => {
+		it("upserts a user vote", async () => {
+			await castVote(1, {
+				deviceId: "550e8400-e29b-41d4-a716-446655440000",
+				vote: "ja",
+			})
+			expect(db.insert).toHaveBeenCalled()
+		})
+	})
+
+	describe("getUserVote", () => {
+		it("returns null when no vote exists", async () => {
+			const result = await getUserVote(
+				1,
+				"550e8400-e29b-41d4-a716-446655440000",
+			)
+			expect(result).toBeNull()
+		})
+
+		it("returns vote when it exists", async () => {
+			const mockVote = {
+				id: 1,
+				deviceId: "550e8400-e29b-41d4-a716-446655440000",
+				legislationId: 1,
+				vote: "ja",
+				votedAt: new Date("2026-03-10"),
+			}
+			const mockChain = {
+				from: vi.fn().mockReturnValue({
+					where: vi.fn().mockReturnValue({
+						limit: vi.fn().mockResolvedValue([mockVote]),
+					}),
+				}),
+			}
+			vi.mocked(db.select).mockReturnValueOnce(
+				mockChain as ReturnType<typeof db.select>,
+			)
+
+			const result = await getUserVote(
+				1,
+				"550e8400-e29b-41d4-a716-446655440000",
+			)
+			expect(result).not.toBeNull()
+			expect(result?.vote).toBe("ja")
+		})
+	})
+})
diff --git a/src/server/features/legislation/schema.ts b/src/server/features/legislation/schema.ts
new file mode 100644
index 0000000..c4b664f
--- /dev/null
+++ b/src/server/features/legislation/schema.ts
@@ -0,0 +1,8 @@
+import { z } from "zod"
+
+export const castVoteSchema = z.object({
+	deviceId: z.string().uuid(),
+	vote: z.enum(["ja", "nein", "enthaltung"]),
+})
+
+export type CastVoteRequest = z.infer<typeof castVoteSchema>
diff --git a/src/server/features/legislation/service.ts b/src/server/features/legislation/service.ts
new file mode 100644
index 0000000..9798f59
--- /dev/null
+++ b/src/server/features/legislation/service.ts
@@ -0,0 +1,107 @@
+import { and, desc, eq } from "drizzle-orm"
+import { db } from "../../shared/db/client"
+import {
+	legislationSummaries,
+	legislationTexts,
+	userVotes,
+} from "../../shared/db/schema/legislation"
+import type { CastVoteRequest } from "./schema"
+
+export async function getUpcomingLegislation() {
+	const rows = await db
+		.select({
+			id: legislationTexts.id,
+			title: legislationTexts.title,
+			beratungsstand: legislationTexts.beratungsstand,
+			summary: legislationSummaries.summary,
+		})
+		.from(legislationTexts)
+		.leftJoin(
+			legislationSummaries,
+			eq(legislationSummaries.legislationId, legislationTexts.id),
+		)
+		.orderBy(desc(legislationTexts.fetchedAt))
+		.limit(20)
+
+	return rows.map((r) => ({
+		id: r.id,
+		title: r.title,
+		beratungsstand: r.beratungsstand,
+		summary: r.summary ?? null,
+	}))
+}
+
+export async function getLegislation(id: number) {
+	const rows = await db
+		.select()
+		.from(legislationTexts)
+		.where(eq(legislationTexts.id, id))
+		.limit(1)
+
+	if (rows.length === 0) return null
+
+	const leg = rows[0]
+
+	// fetch summary if available
+	const summaries = await db
+		.select()
+		.from(legislationSummaries)
+		.where(eq(legislationSummaries.legislationId, id))
+		.limit(1)
+
+	return {
+		id: leg.id,
+		dipVorgangsId: leg.dipVorgangsId,
+		title: leg.title,
+		abstract: leg.abstract,
+		fullText: leg.fullText,
+		drucksacheUrl: leg.drucksacheUrl,
+		beratungsstand: leg.beratungsstand,
+		summary: summaries[0]?.summary ?? null,
+		fetchedAt: leg.fetchedAt.toISOString(),
+	}
+}
+
+export async function getLegislationText(id: number) {
+	const rows = await db
+		.select({ fullText: legislationTexts.fullText })
+		.from(legislationTexts)
+		.where(eq(legislationTexts.id, id))
+		.limit(1)
+
+	return rows[0]?.fullText ?? null
+}
+
+export async function castVote(legislationId: number, data: CastVoteRequest) {
+	await db
+		.insert(userVotes)
+		.values({
+			deviceId: data.deviceId,
+			legislationId,
+			vote: data.vote,
+		})
+		.onConflictDoUpdate({
+			target: [userVotes.deviceId, userVotes.legislationId],
+			set: { vote: data.vote, votedAt: new Date() },
+		})
+}
+
+export async function getUserVote(legislationId: number, deviceId: string) {
+	const rows = await db
+		.select()
+		.from(userVotes)
+		.where(
+			and(
+				eq(userVotes.legislationId, legislationId),
+				eq(userVotes.deviceId, deviceId),
+			),
+		)
+		.limit(1)
+
+	if (rows.length === 0) return null
+	return {
+		legislationId: rows[0].legislationId,
+		vote: rows[0].vote,
+		votedAt: rows[0].votedAt.toISOString(),
+	}
+}