diff --git a/src/build/queue.v b/src/build/queue.v
index e87024b..e74529c 100644
--- a/src/build/queue.v
+++ b/src/build/queue.v
@@ -13,7 +13,7 @@ pub mut:
 	// Next timestamp from which point this job is allowed to be executed
 	timestamp time.Time
 	// Required for calculating next timestamp after having pop'ed a job
-	ce &CronExpression = unsafe { nil }
+	ce CronExpression
 	// Actual build config sent to the agent
 	config BuildConfig
 	// Whether this is a one-time job
@@ -30,7 +30,7 @@ fn (r1 BuildJob) < (r2 BuildJob) bool {
 // for each architecture. Agents receive jobs from this queue.
 pub struct BuildJobQueue {
 	// Schedule to use for targets without explicitely defined cron expression
-	default_schedule &CronExpression
+	default_schedule CronExpression
 	// Base image to use for targets without defined base image
 	default_base_image string
 mut:
@@ -44,9 +44,9 @@ mut:
 }
 
 // new_job_queue initializes a new job queue
-pub fn new_job_queue(default_schedule &CronExpression, default_base_image string) BuildJobQueue {
+pub fn new_job_queue(default_schedule CronExpression, default_base_image string) BuildJobQueue {
 	return BuildJobQueue{
-		default_schedule: unsafe { default_schedule }
+		default_schedule: default_schedule
 		default_base_image: default_base_image
 		invalidated: map[int]time.Time{}
 	}
diff --git a/src/cron/cli.v b/src/cron/cli.v
new file mode 100644
index 0000000..16a3537
--- /dev/null
+++ b/src/cron/cli.v
@@ -0,0 +1,32 @@
+module cron
+
+import cli
+import conf as vconf
+
+struct Config {
+pub:
+	log_level               string = 'WARN'
+	api_key                 string
+	address                 string
+	data_dir                string
+	base_image              string = 'archlinux:base-devel'
+	max_concurrent_builds   int    = 1
+	api_update_frequency    int    = 15
+	image_rebuild_frequency int    = 1440
+	// Replicates the behavior of the original cron system
+	global_schedule string = '0 3'
+}
+
+// cmd returns the cli module that handles the cron daemon.
+pub fn cmd() cli.Command {
+	return cli.Command{
+		name: 'cron'
+		description: 'Start the cron service that periodically runs builds.'
+		execute: fn (cmd cli.Command) ! {
+			config_file := cmd.flags.get_string('config-file')!
+			conf := vconf.load<Config>(prefix: 'VIETER_', default_path: config_file)!
+
+			cron(conf)!
+		}
+	}
+}
diff --git a/src/cron/cron.v b/src/cron/cron.v
new file mode 100644
index 0000000..f1d6b7b
--- /dev/null
+++ b/src/cron/cron.v
@@ -0,0 +1,33 @@
+module cron
+
+import log
+import cron.daemon
+import cron.expression
+import os
+
+const log_file_name = 'vieter.cron.log'
+
+// cron starts a cron daemon & starts periodically scheduling builds.
+pub fn cron(conf Config) ! {
+	// Configure logger
+	log_level := log.level_from_tag(conf.log_level) or {
+		return error('Invalid log level. The allowed values are FATAL, ERROR, WARN, INFO & DEBUG.')
+	}
+
+	mut logger := log.Log{
+		level: log_level
+	}
+
+	log_file := os.join_path_single(conf.data_dir, cron.log_file_name)
+	logger.set_full_logpath(log_file)
+	logger.log_to_console_too()
+
+	ce := expression.parse_expression(conf.global_schedule) or {
+		return error('Error while parsing global cron expression: $err.msg()')
+	}
+
+	mut d := daemon.init_daemon(logger, conf.address, conf.api_key, conf.base_image, ce,
+		conf.max_concurrent_builds, conf.api_update_frequency, conf.image_rebuild_frequency)!
+
+	d.run()
+}
diff --git a/src/cron/daemon/build.v b/src/cron/daemon/build.v
new file mode 100644
index 0000000..42edc92
--- /dev/null
+++ b/src/cron/daemon/build.v
@@ -0,0 +1,115 @@
+module daemon
+
+import time
+import sync.stdatomic
+import build
+import os
+
+const (
+	build_empty   = 0
+	build_running = 1
+	build_done    = 2
+)
+
+// clean_finished_builds removes finished builds from the build slots & returns
+// them.
+fn (mut d Daemon) clean_finished_builds() []ScheduledBuild {
+	mut out := []ScheduledBuild{}
+
+	for i in 0 .. d.atomics.len {
+		if stdatomic.load_u64(&d.atomics[i]) == daemon.build_done {
+			stdatomic.store_u64(&d.atomics[i], daemon.build_empty)
+			out << d.builds[i]
+		}
+	}
+
+	return out
+}
+
+// update_builds starts as many builds as possible.
+fn (mut d Daemon) start_new_builds() {
+	now := time.now()
+
+	for d.queue.len() > 0 {
+		elem := d.queue.peek() or {
+			d.lerror("queue.peek() unexpectedly returned an error. This shouldn't happen.")
+
+			break
+		}
+
+		if elem.timestamp < now {
+			sb := d.queue.pop() or {
+				d.lerror("queue.pop() unexpectedly returned an error. This shouldn't happen.")
+
+				break
+			}
+
+			// If this build couldn't be scheduled, no more will be possible.
+			if !d.start_build(sb) {
+				d.queue.insert(sb)
+				break
+			}
+		} else {
+			break
+		}
+	}
+}
+
+// start_build starts a build for the given ScheduledBuild object.
+fn (mut d Daemon) start_build(sb ScheduledBuild) bool {
+	for i in 0 .. d.atomics.len {
+		if stdatomic.load_u64(&d.atomics[i]) == daemon.build_empty {
+			stdatomic.store_u64(&d.atomics[i], daemon.build_running)
+			d.builds[i] = sb
+
+			go d.run_build(i, sb)
+
+			return true
+		}
+	}
+
+	return false
+}
+
+// run_build actually starts the build process for a given target.
+fn (mut d Daemon) run_build(build_index int, sb ScheduledBuild) {
+	d.linfo('started build: $sb.target.url -> $sb.target.repo')
+
+	// 0 means success, 1 means failure
+	mut status := 0
+
+	res := build.build_target(d.client.address, d.client.api_key, d.builder_images.last(),
+		&sb.target, false) or {
+		d.ldebug('build_target error: $err.msg()')
+		status = 1
+
+		build.BuildResult{}
+	}
+
+	if status == 0 {
+		d.linfo('finished build: $sb.target.url -> $sb.target.repo; uploading logs...')
+
+		build_arch := os.uname().machine
+		d.client.add_build_log(sb.target.id, res.start_time, res.end_time, build_arch,
+			res.exit_code, res.logs) or {
+			d.lerror('Failed to upload logs for build: $sb.target.url -> $sb.target.repo')
+		}
+	} else {
+		d.linfo('an error occured during build: $sb.target.url -> $sb.target.repo')
+	}
+
+	stdatomic.store_u64(&d.atomics[build_index], daemon.build_done)
+}
+
+// current_build_count returns how many builds are currently running.
+fn (mut d Daemon) current_build_count() int {
+	mut res := 0
+
+	for i in 0 .. d.atomics.len {
+		if stdatomic.load_u64(&d.atomics[i]) == daemon.build_running {
+			res += 1
+		}
+	}
+
+	return res
+}
diff --git a/src/cron/daemon/daemon.v b/src/cron/daemon/daemon.v
new file mode 100644
index 0000000..b94dab8
--- /dev/null
+++ b/src/cron/daemon/daemon.v
@@ -0,0 +1,274 @@
+module daemon
+
+import time
+import log
+import datatypes { MinHeap }
+import cron.expression { CronExpression, parse_expression }
+import math
+import build
+import docker
+import os
+import client
+import models { Target }
+
+const (
+	// How many seconds to wait before retrying to update API if failed
+	api_update_retry_timeout        = 5
+	// How many seconds to wait before retrying to rebuild image if failed
+	rebuild_base_image_retry_timout = 30
+)
+
+struct ScheduledBuild {
+pub:
+	target    Target
+	timestamp time.Time
+}
+
+// Overloaded operator for comparing ScheduledBuild objects
+fn (r1 ScheduledBuild) < (r2 ScheduledBuild) bool {
+	return r1.timestamp < r2.timestamp
+}
+
+pub struct Daemon {
+mut:
+	client                  client.Client
+	base_image              string
+	builder_images          []string
+	global_schedule         CronExpression
+	api_update_frequency    int
+	image_rebuild_frequency int
+	// Targets currently loaded from API.
+	targets []Target
+	// At what point to update the list of targets.
+	api_update_timestamp  time.Time
+	image_build_timestamp time.Time
+	queue                 MinHeap<ScheduledBuild>
+	// Which builds are currently running
+	builds []ScheduledBuild
+	// Atomic variables used to detect when a build has finished; length is the
+	// same as builds
+	atomics []u64
+	logger  shared log.Log
+}
+
+// init_daemon initializes a new Daemon object. It renews the targets &
+// populates the build queue for the first time.
+pub fn init_daemon(logger log.Log, address string, api_key string, base_image string, global_schedule CronExpression, max_concurrent_builds int, api_update_frequency int, image_rebuild_frequency int) !Daemon {
+	mut d := Daemon{
+		client: client.new(address, api_key)
+		base_image: base_image
+		global_schedule: global_schedule
+		api_update_frequency: api_update_frequency
+		image_rebuild_frequency: image_rebuild_frequency
+		atomics: []u64{len: max_concurrent_builds}
+		builds: []ScheduledBuild{len: max_concurrent_builds}
+		logger: logger
+	}
+
+	// Initialize the targets & queue
+	d.renew_targets()
+	d.renew_queue()
+	if !d.rebuild_base_image() {
+		return error('The base image failed to build. The Vieter cron daemon cannot run without an initial builder image.')
+	}
+
+	return d
+}
+
+// run starts the actual daemon process. It runs builds when possible &
+// periodically refreshes the list of targets to ensure we stay in sync.
+pub fn (mut d Daemon) run() {
+	for {
+		finished_builds := d.clean_finished_builds()
+
+		// Update the API's contents if needed & renew the queue
+		if time.now() >= d.api_update_timestamp {
+			d.renew_targets()
+			d.renew_queue()
+		}
+		// The finished builds should only be rescheduled if the API contents
+		// haven't been renewed.
+		else {
+			for sb in finished_builds {
+				d.schedule_build(sb.target)
+			}
+		}
+
+		// TODO remove old builder images.
+		// This issue is less trivial than it sounds, because a build could
+		// still be running when the image has to be rebuilt. That would
+		// prevent the image from being removed. Therefore, we will need to
+		// keep track of a list or something & remove an image once we have
+		// made sure it isn't being used anymore.
+		if time.now() >= d.image_build_timestamp {
+			d.rebuild_base_image()
+			// In theory, executing this function here allows an old builder
+			// image to exist for at most image_rebuild_frequency minutes.
+			d.clean_old_base_images()
+		}
+
+		// Schedules new builds when possible
+		d.start_new_builds()
+
+		// If there are builds currently running, the daemon should refresh
+		// every second to clean up any finished builds & start new ones.
+		mut delay := time.Duration(1 * time.second)
+
+		// Sleep either until we have to refresh the targets or when the next
+		// build has to start, with a minimum of 1 second.
+		if d.current_build_count() == 0 {
+			now := time.now()
+			delay = d.api_update_timestamp - now
+
+			if d.queue.len() > 0 {
+				elem := d.queue.peek() or {
+					d.lerror("queue.peek() unexpectedly returned an error. This shouldn't happen.")
+
+					// This is just a fallback option. In theory, queue.peek()
+					// should *never* return an error or none, because we check
+					// its len beforehand.
+					time.sleep(1)
+					continue
+				}
+
+				time_until_next_job := elem.timestamp - now
+
+				delay = math.min(delay, time_until_next_job)
+			}
+		}
+
+		// We sleep for at least one second. This is to prevent the program
+		// from looping agressively when a cronjob can be scheduled, but
+		// there's no spots free for it to be started.
+		delay = math.max(delay, 1 * time.second)
+
+		d.ldebug('Sleeping for ${delay}...')
+
+		time.sleep(delay)
+	}
+}
+
+// schedule_build adds the next occurence of the given targets build to the
+// queue.
+fn (mut d Daemon) schedule_build(target Target) {
+	ce := if target.schedule != '' {
+		parse_expression(target.schedule) or {
+			// TODO This shouldn't return an error if the expression is empty.
+			d.lerror("Error while parsing cron expression '$target.schedule' (id $target.id): $err.msg()")
+
+			d.global_schedule
+		}
+	} else {
+		d.global_schedule
+	}
+
+	// A target that can't be scheduled will just be skipped for now
+	timestamp := ce.next_from_now() or {
+		d.lerror("Couldn't calculate next timestamp from '$target.schedule'; skipping")
+		return
+	}
+
+	d.queue.insert(ScheduledBuild{
+		target: target
+		timestamp: timestamp
+	})
+}
+
+// renew_targets requests the newest list of targets from the server & replaces
+// the old one.
+fn (mut d Daemon) renew_targets() {
+	d.linfo('Renewing targets...')
+
+	mut new_targets := d.client.get_all_targets() or {
+		d.lerror('Failed to renew targets. Retrying in ${daemon.api_update_retry_timeout}s...')
+		d.api_update_timestamp = time.now().add_seconds(daemon.api_update_retry_timeout)
+
+		return
+	}
+
+	// Filter out any targets that shouldn't run on this architecture
+	cur_arch := os.uname().machine
+	new_targets = new_targets.filter(it.arch.any(it.value == cur_arch))
+
+	d.targets = new_targets
+
+	d.api_update_timestamp = time.now().add_seconds(60 * d.api_update_frequency)
+}
+
+// renew_queue replaces the old queue with a new one that reflects the newest
+// values in targets.
+fn (mut d Daemon) renew_queue() {
+	d.linfo('Renewing queue...')
+	mut new_queue := MinHeap<ScheduledBuild>{}
+
+	// Move any jobs that should have already started from the old queue onto
+	// the new one
+	now := time.now()
+
+	// For some reason, using
+	// ```v
+	// for d.queue.len() > 0 && d.queue.peek() !.timestamp < now {
+	//```
+	// here causes the function to prematurely just exit, without any errors or anything, very weird
+	// https://github.com/vlang/v/issues/14042
+	for d.queue.len() > 0 {
+		elem := d.queue.pop() or {
+			d.lerror("queue.pop() returned an error. This shouldn't happen.")
+			continue
+		}
+
+		if elem.timestamp < now {
+			new_queue.insert(elem)
+		} else {
+			break
+		}
+	}
+
+	d.queue = new_queue
+
+	// For each target in targets, parse their cron expression (or use the
+	// default one if not present) & add them to the queue
+	for target in d.targets {
+		d.schedule_build(target)
+	}
+}
+
+// rebuild_base_image recreates the builder image.
+fn (mut d Daemon) rebuild_base_image() bool {
+	d.linfo('Rebuilding builder image....')
+
+	d.builder_images << build.create_build_image(d.base_image) or {
+		d.lerror('Failed to rebuild base image. Retrying in ${daemon.rebuild_base_image_retry_timout}s...')
+		d.image_build_timestamp = time.now().add_seconds(daemon.rebuild_base_image_retry_timout)
+
+		return false
+	}
+
+	d.image_build_timestamp = time.now().add_seconds(60 * d.image_rebuild_frequency)
+
+	return true
+}
+
+// clean_old_base_images tries to remove any old but still present builder
+// images.
+fn (mut d Daemon) clean_old_base_images() {
+	mut i := 0
+
+	mut dd := docker.new_conn() or {
+		d.lerror('Failed to connect to Docker socket.')
+		return
+	}
+
+	defer {
+		dd.close() or {}
+	}
+
+	for i < d.builder_images.len - 1 {
+		// For each builder image, we try to remove it by calling the Docker
+		// API. If the function returns an error or false, that means the image
+		// wasn't deleted. Therefore, we move the index over. If the function
+		// returns true, the array's length has decreased by one so we don't
+		// move the index.
+		dd.image_remove(d.builder_images[i]) or { i += 1 }
+	}
+}
diff --git a/src/cron/daemon/log.v b/src/cron/daemon/log.v
new file mode 100644
index 0000000..95a50e7
--- /dev/null
+++ b/src/cron/daemon/log.v
@@ -0,0 +1,35 @@
+module daemon
+
+import log
+
+// log reate a log message with the given level
+pub fn (mut d Daemon) log(msg string, level log.Level) {
+	lock d.logger {
+		d.logger.send_output(msg, level)
+	}
+}
+
+// lfatal create a log message with the fatal level
+pub fn (mut d Daemon) lfatal(msg string) {
+	d.log(msg, log.Level.fatal)
+}
+
+// lerror create a log message with the error level
+pub fn (mut d Daemon) lerror(msg string) {
+	d.log(msg, log.Level.error)
+}
+
+// lwarn create a log message with the warn level
+pub fn (mut d Daemon) lwarn(msg string) {
+	d.log(msg, log.Level.warn)
+}
+
+// linfo create a log message with the info level
+pub fn (mut d Daemon) linfo(msg string) {
+	d.log(msg, log.Level.info)
+}
+
+// ldebug create a log message with the debug level
+pub fn (mut d Daemon) ldebug(msg string) {
+	d.log(msg, log.Level.debug)
+}
diff --git a/src/cron/expression/c/expression.c b/src/cron/expression/c/expression.c
index 3b03f7a..3d12604 100644
--- a/src/cron/expression/c/expression.c
+++ b/src/cron/expression/c/expression.c
@@ -7,14 +7,6 @@ CronExpression *ce_init() {
     return malloc(sizeof(CronExpression));
 }
 
-void ce_free(CronExpression *ce) {
-    free(ce->months);
-    free(ce->days);
-    free(ce->hours);
-    free(ce->minutes);
-    free(ce);
-}
-
 int ce_next(SimpleTime *out, CronExpression *ce, SimpleTime *ref) {
 	// For all of these values, the rule is the following: if their value is
 	// the length of their respective array in the CronExpression object, that
diff --git a/src/cron/expression/c/expression.h b/src/cron/expression/c/expression.h
index b849b9a..12dbdec 100644
--- a/src/cron/expression/c/expression.h
+++ b/src/cron/expression/c/expression.h
@@ -31,8 +31,6 @@ typedef struct simple_time {
 
 CronExpression *ce_init();
 
-void ce_free(CronExpression *ce);
-
 /**
  * Given a 
  */
diff --git a/src/cron/expression/expression.c.v b/src/cron/expression/expression.c.v
index 452e512..27e6193 100644
--- a/src/cron/expression/expression.c.v
+++ b/src/cron/expression/expression.c.v
@@ -2,34 +2,30 @@ module expression
 
 #flag -I @VMODROOT/c
 #flag @VMODROOT/c/parse.o
-#flag @VMODROOT/c/expression.o
 #include "expression.h"
 
-[heap]
 pub struct C.CronExpression {
-	minutes      &u8
-	hours        &u8
-	days         &u8
-	months       &u8
+	minutes &u8
+	hours &u8
+	days &u8
+	months &u8
 	minute_count u8
-	hour_count   u8
-	day_count    u8
-	month_count  u8
+	hour_count u8
+	day_count u8
+	month_count u8
+}
+
+struct C.SimpleTime {
+	year int
+	month int
+	day int
+	hour int
+	minute int
 }
 
 pub type CronExpression = C.CronExpression
 
-struct C.SimpleTime {
-	year   int
-	month  int
-	day    int
-	hour   int
-	minute int
-}
-
-fn C.ce_init() &C.CronExpression
-
-fn C.ce_free(ce &C.CronExpression)
+fn C.ce_init() &CronExpression
 
 fn C.ce_next(out &C.SimpleTime, ce &C.CronExpression, ref &C.SimpleTime) int
 
diff --git a/src/cron/expression/expression.v b/src/cron/expression/expression.v
index 208b9cb..095acf0 100644
--- a/src/cron/expression/expression.v
+++ b/src/cron/expression/expression.v
@@ -4,19 +4,16 @@ import time
 
 pub fn parse_expression(exp string) !&CronExpression {
 	out := C.ce_init()
+
 	res := C.ce_parse_expression(out, exp.str)
 
-	if res != 0 {
-		return error('yuhh')
-	}
-
+			 if res != 0 {
+				return error('yuhh')
+			 }
+	
 	return out
 }
 
-pub fn (ce &CronExpression) free() {
-	C.ce_free(ce)
-}
-
 pub fn (ce &CronExpression) next(ref time.Time) !time.Time {
 	st := C.SimpleTime{
 		year: ref.year
@@ -29,10 +26,10 @@ pub fn (ce &CronExpression) next(ref time.Time) !time.Time {
 	out := C.SimpleTime{}
 	res := C.ce_next(&out, ce, &st)
 
-	if res != 0 {
-		return error('yuhh')
-	}
-
+			 if res != 0 {
+				return error('yuhh')
+			 }
+	
 	return time.new_time(time.Time{
 		year: out.year
 		month: out.month
@@ -46,10 +43,10 @@ pub fn (ce &CronExpression) next_from_now() !time.Time {
 	out := C.SimpleTime{}
 	res := C.ce_next_from_now(&out, ce)
 
-	if res != 0 {
-		return error('yuhh')
-	}
-
+			 if res != 0 {
+				return error('yuhh')
+			 }
+	
 	return time.new_time(time.Time{
 		year: out.year
 		month: out.month
@@ -58,17 +55,3 @@ pub fn (ce &CronExpression) next_from_now() !time.Time {
 		minute: out.minute
 	})
 }
-
-// next_n returns the n next occurences of the expression, given a starting
-// time.
-pub fn (ce &CronExpression) next_n(ref time.Time, n int) ![]time.Time {
-	mut times := []time.Time{cap: n}
-
-	times << ce.next(ref)!
-
-	for i in 1 .. n {
-		times << ce.next(times[i - 1])!
-	}
-
-	return times
-}
diff --git a/src/main.v b/src/main.v
index ce9ec81..1c8b816 100644
--- a/src/main.v
+++ b/src/main.v
@@ -9,6 +9,7 @@ import console.schedule
 import console.man
 import console.aur
 import console.repos
+import cron
 import agent
 
 fn main() {
@@ -42,6 +43,7 @@ fn main() {
 		commands: [
 			server.cmd(),
 			targets.cmd(),
+			cron.cmd(),
 			logs.cmd(),
 			schedule.cmd(),
 			man.cmd(),