StackOptimise is a leading GTM (Go-To-Market) Engineering Agency founded in October 2024 by brothers Felix and Penn Frank, who bring a combined 15+ years of frontline B2B sales experience. Before launching StackOptimise, they climbed the ranks from SDRs to AEs to Heads of Sales at publicly traded companies like Deliveroo and Confluent, and VC-backed scale-ups like Monzo, Birdie, Oxwash, and Stream Native.
StackOptimise builds tech-powered outbound systems that leverage signal-based outreach to deliver personalized campaigns at scale and book more meetings with quality leads. They send 500,000+ cold messages monthly across email, LinkedIn, and WhatsApp, and have driven £10M+ in pipeline for their clients.
What makes them unique: StackOptimise is the only agency in the world triple-certified by Clay, Smartlead, and GetSales, one of only 9 agencies globally to hold both Clay and Smartlead certifications. They’ve tested 800+ sales tools and built a $150K enterprise tech stack that clients get full access to.
The team has grown to include GTM Engineers and now supports 40+ B2B companies while maintaining a community of 50,000+ sales professionals through their newsletter and educational content.
Sales Automation Systems (SAS) is a B2B-focused agency specializing in AI-driven cold email infrastructure, list building, and AI personalization services. Founded by Taylor Haren in 2023, the company helps B2B sales teams build scalable cold email systems that deliver exceptional results at volume.
Taylor’s journey began in the staffing industry, where he generated $8.19M in sales from 2019-2021 and an impressive $14.1M in 2022 by leveraging AI and Sales Automation. His entry into cold email infrastructure started when he helped a friend’s business overcome email delivery issues, within 25 days, he restored their email delivery rate to 100% and set up systems sending 1,500 cold emails daily with a 16% reply rate. This success led to referrals and the founding of SAS.
The company’s growth has been 100% referral-based, a testament to the quality of results they deliver. In its first year, SAS achieved an ARR of half a million dollars and has since grown 130% year-over-year.
Understory is a full-service “allbound” GTM growth partner for B2B SaaS companies, founded by Alex Fine and Ali Yildirim. The agency bridges the gap between sales and marketing to create unified, multi-channel growth systems. They build and manage complex, segmented, trigger-based outbound campaigns and blend them with paid media across LinkedIn, Google, and Reddit.
What sets Understory apart is their status as one of the top Clay Enterprise Partners globally, they actually run paid media campaigns for Clay itself. They treat Clay as a central hub to enrich outbound and paid media campaigns, create bespoke sales triggers, build automations from website traffic, and sync paid media with outbound efforts.
Naufal Nugroho (Head of GTM) transitioned from Account Executive to GTM Engineer, built his own cold email and Clay agency to six figures, then merged it into Understory. He has generated over $4 million in pipeline across 20 clients. Alex Fine scaled Understory from $6K to multiple hundreds of thousands in monthly revenue after going full-time in October 2023. The team of 20+ has worked with high-profile clients including Clay, Retention.com/RB2B, Nylas, Wiza, and others.
OneAway is a premium Growth Studio that builds and runs fully-managed cold email systems for B2B companies. Founded in 2022 by Xavier Caffrey, a former AWS and Salesforce sales professional, OneAway has supported 50+ startups across North America, the UK, and the UAE. Their tagline: “The output of 10 SDRs. Zero headcount. We engineer pipeline, not leads.”
OneAway’s model is simple: clients fill out an Ideal Customer Profile form, and OneAway handles everything else, 10,000 fresh leads per month sourced from 105+ data points, 2 high-performing campaigns per month, reply sorting and auto-booking for interested leads, and human-written copy that’s personalized and punchy.
Xavier brings a unique background, before tech sales, he was a professional magician. In 2020, he pivoted to tech sales and spent 3 years at companies like AWS and Salesforce before launching OneAway. The agency has grown from a one-man operation to a team of 8-12 sales engineers.
LeadGrow uncovers offers so relevant they don’t feel like outreach. We find people who need you RIGHT NOW, before competitors know they exist, by targeting the moments when pain becomes urgent.
Most outbound targets markets. We target situations.
Intent signals only reach the top 1-3% of your market and everyone’s fighting for the same inboxes. Generic market blasts get 0.8% reply rates.
LeadGrow targets buying situations, specific moments when pain becomes urgent:
A VP hired 60 days ago inheriting a broken process
A company that just raised Series B and needs to scale fast
CAC spiked 40% last quarter and the board is asking questions
They just ripped out a competitor’s tool and are actively shopping
The signal isn’t “they fit the profile.” The signal is “something just changed.”
The Three Pillars
Pillar 1: Situations, Not Markets
We mine buying situations at two levels, business context (funding, hiring, tech changes) and individual career moments (new role, inherited mess, promotion pressure). We analyze CRM data, job postings, tech stack signals, funding events, and community forums to identify 3-5 situations where your solution is urgent RIGHT NOW.
Pillar 2: Technicians, Not Maintenance Men
We don’t send “Hi, we help companies with X.” We diagnose hidden problems your prospect didn’t know they had. Generic message: “We help sales teams improve outbound.” Diagnostic message: “Saw you hired 3 AEs in 60 days. Most VPs at your stage struggle because new reps pitch the wrong person and blame ‘bad leads.’ That happening?” Technician messages build instant trust through diagnosis, not claims.
Pillar 3: End to End, Not Fragmented
Most agencies send the email and forward you the reply 4 hours later. By then the prospect is cold. We respond in under 5 minutes. We qualify while context is hot. We book the meeting. We confirm twice. If they no-show, we recover them. You get people who actually show up, 68% show rate vs the 40-50% industry average.
What’s Included
1. Situation Mining
Identify 3-5 buying situations where your solution is urgent. Custom research into CRM patterns, job postings, funding events, tech stack shifts, and community signals.
2. Custom Data Scraping
Build scrapers to find prospects competitors don’t know exist. Not Apollo/ZoomInfo lists everyone’s using, custom sources with emptier inboxes and better-fit audiences.
3. Bespoke Message Engineering
5-7 message variants tested per week, wrapped around your specific offer and the pain each situation creates. Every message is engineered for the situation, the pain it creates, and how YOUR solution wraps around it.
4. Full Lead Engagement
Reply monitoring, under-5-minute response times, prospect qualification, meeting booking, 2x confirmation, and no-show recovery. You get qualified meetings on your calendar with full context notes.
5. GTM Intelligence
Everything syncs to your CRM. Learn which situations convert best intel that works across your paid ads, content, and inbound. Weekly performance reports with situation breakdowns and message test results.
Proven Results
Aggregate Performance (2025)
3,626 campaigns managed across multiple industries and geographies
6.74% average reply rate (industry average: 1-2%)
12.53% positive reply rate (1 in 8 replies is interested)
68% meeting show rate (industry: 40-50%)
Ground Truth Copy Testing (2026)
17 campaigns meet our ground truth threshold, converting at better than 1 interested reply per 500 contacts. Our best campaign converts at 1 interested per 26 contacts. The dominant winning pattern: hypothetical framing with hyper-specific cultural or situational hooks.
Beanstalk Consulting is a full-stack “Outbound as a Service” agency based in St. Petersburg, Florida. Founded in January 2023 by Dean Fiacco, the agency specializes in building complete outbound-to-revenue systems for B2B tech and finance companies.
Dean Fiacco is a Certified Clay Expert and SmartLead Certified Partner with 10+ years of experience building GTM, Sales, and Operations for early-stage startups. The team helps companies transition from founder-led sales to structured outbound approaches without losing momentum.
The agency has generated $40M+ in pipeline across clients and operates ScaledMail, a proprietary cold email infrastructure SaaS enabling 100K+ emails/month at 95% deliverability. Engagements are structured around monthly retainers and fixed packages, with no long-term contracts.
Reachly is a B2B lead generation agency founded in 2023 by Thibault Garcia and based in Bangkok, Thailand. The agency works with B2B companies across APAC to generate sales-qualified leads and consistent B2B meetings using a multi-channel outbound approach that combines cold email, LinkedIn outreach and targeted calling.
Before starting Reachly, Thibault spent more than 12 years in corporate go-to-market and growth roles, including at Agoda. He later built a lead generation and appointment setting practice delivering over 200 projects, refining a practical outbound strategy focused on real conversations rather than mass messaging.
Today, Reachly runs signal-driven outbound campaigns rather than traditional list-based prospecting. Using its internal workflows and AI Ark data engine, the team builds targeted prospect lists, identifies buying intent across multiple data sources, and launches personalized outreach when a company is actively evaluating solutions. Each campaign combines cold email outreach and LinkedIn lead generation with structured follow-ups designed to convert interest into booked demos and sales calls.
Reachly manages fully done-for-you outbound lead generation campaigns, handling list building, messaging, deliverability and follow-up sequences. Clients typically use the service as an outsourced SDR and appointment setting function, allowing founders and sales teams to focus on closing opportunities while maintaining a predictable pipeline of qualified leads.
The agency now operates with a team of seven and supports companies across Thailand, Singapore, Malaysia, Hong Kong, Indonesia and Australia. Reachly’s goal is simple: help B2B companies build a reliable outbound pipeline and improve ROI from cold email and LinkedIn outreach without needing to build an in-house outbound team.
Workflows is an AI-first growth studio specializing in helping B2B tech companies scale revenue through 4 service lines: Content, Outbound, AI RevOps, and ABM.
Combining AI workflows with human expertise to implement end-to-end growth systems.
Not another software.
Not another traditional agency.
Workflows is an AI-first growth studio that delivers outcomes.
We’ve worked with 200+ companies, tested 250+ AI sales tools, and generated over 10M organic impressions on LinkedIn.
Some of the companies that trust us include: Cluely, Landbase, Cargo, Medrio, Proton, Meister, Seam.
Javeria Shah is the Co-Founder & CTO of DFY Automation – and the first-ever Clay GTM World Cup Champion (2025). She earned that title by competing against 32 of the world’s top GTM Engineers, advancing through regional quarterfinals in Bangkok before claiming the inaugural championship at SCULPT in San Francisco on September 17, 2025. Her approach blends deep technical mastery of Clay workflows with sharp business acumen, turning complex automation challenges into elegant, scalable solutions.
Together with Co-Founder & CEO Ali Asghar, Javeria built DFY Automation – a premium Go-To-Market automation agency based in Islamabad, Pakistan. The agency specializes in two core disciplines: All-Bound Go-To-Market and Business Process Automation, building done-for-you systems that transform businesses into self-running machines. DFY Automation works with B2B companies globally, helping them scale their outbound, data operations, and internal processes without the operational overhead.
Lead Assassin is the first official Clay Agency based in the Philippines, building high-converting outbound systems for GTM teams using Clay and AI. Founded by Ericson Dalusong, the agency has grown to a team of 27 people and crossed $2.4M ARR with 30%+ month-over-month growth.
Over six years, Ericson has helped businesses scale by leveraging tech-driven pipeline generation and GTM automation. He has sent millions of cold emails and generated over 5,000 B2B sales opportunities using advanced GTM strategies. The agency has successfully implemented systems for 80+ clients, generating more than $1M in pipeline.
Lead Assassin leads the GTM movement in the Philippines, hosting Clay Club Manila the first-ever GTM event in the city and building a community of 300+ Clay builders and GTM engineers across the country. They host GTM-focused events every quarter to share use cases, tools, and playbooks.
Spring Drive is a premium GTM Engineering and B2B pipeline generation agency founded by Mohan Muthoo, based in London, UK. The agency specializes in AI-powered outbound and GTM engineering for B2B SaaS/Tech and B2B Services companies across North America and Europe.
Spring Drive was recognized as a GTM Leader by Attio and featured on the Nasdaq Billboard in Times Square, New York in 2024. They are the 4th Ever Official Clay Expert in the UK, vetted back in 2024 as an early adopter when there were very few experts globally.
The agency has completed 300+ campaigns. They deliver an average of $660K+ in pipeline value per client monthly and maintain a 2.1X better positive reply ratio than the industry average, 1 in 190 compared to the industry average of 1 in 340.
Spring Drive was panel-nominated as a Finalist at both the UK Digital Excellence Awards 2025 in the Standout Use of AI category and the GTM10 Awards for their leading Outbound GTM Engineering work.
Allbound OS is an AI-driven outbound systems agency that designs and operates fully-engineered pipeline infrastructures for B2B companies. Founded by Can Timağur, a growth architect specializing in AI-powered revenue systems, Allbound OS helps companies replace manual prospecting with structured, scalable outbound engines.
The model is straightforward: clients define their ICP and growth objectives, and Allbound OS builds the system around it, data architecture, enrichment logic, segmentation strategy, multi-touch sequencing, AI-personalized messaging layers, and automation workflows across tools like Claude Code, Clay, Instantly, and more. Instead of sending volume-based campaigns, the focus is on controlled experimentation, deliverability stability, and measurable pipeline output.
Before launching Allbound OS, Can worked deeply in AI-driven growth and outbound consulting, engineering multi-layer automation systems for B2B teams. His work centers on transforming outbound from a campaign activity into a structured revenue infrastructure.
GrowthPal is a GTM engineering company specializing in building custom, high-ROI go-to-market systems for B2B companies targeting Mid-Market and Enterprise. From signal-based outbound and multi-channel sequencing to fully custom GTM workflows and Clay-powered automation.
we engineer end-to-end playbooks designed to start conversations with the accounts that matter. Every engagement is built around one goal:
getting decision-makers at complex, high-value companies to reply.
7xGTM is a B2B automated outbound systems agency that builds end-to-end GTM engines for companies that need qualified pipeline, on autopilot. Founded by Muhammad Taimoor Ali and Nayab Osaf, 7xGTM specialises in designing signal-driven prospecting systems that identify, enrich, and engage ideal-fit buyers without the manual grind.
Their approach goes beyond sending cold emails. 7xGTM architects full outbound infrastructure: ICP definition, data enrichment workflows, AI-powered personalisation, sequencing, and delivery, all orchestrated so sales teams spend their time closing, not researching. They leverage Clay as a core engine, building intelligent data pipelines that surface buying signals and trigger hyper-relevant outreach at scale.
GrowthFlare is a growth architecture firm built for advisory and service businesses that need a systematic, compounding pipeline, not another disconnected stack of tools. Founded by Aaron Shepherd in Toronto, GrowthFlare has generated qualified pipeline for 50+ businesses across more than 50 markets, deploying growth systems that combine market intelligence, hypothesis-driven targeting, and unified multi-channel distribution.
Their proprietary 4-Layer Growth Operating System works differently from traditional agencies: rather than running isolated campaigns, GrowthFlare builds a living intelligence layer that analyzes buyer conversations, refines targeting, and feeds every data point back into a compounding system. Each 90-day engagement ends with a full Growth Architecture Playbook, ICPs, channel playbooks, copy libraries, and dashboards, that clients keep and own forever.
LeadForce Solutions is a done-for-you outbound system agency built by Aaron Gusinov, who formally ran a $1B/year marketing program at American Express and rebuild email infrastructure at JPMorgan Chase.
What makes LeadForce different is the ownership model: everything is built inside the client’s own stack, domains, lead lists, sequences, CRM integrations, so the system belongs to the client forever, not the agency.
Aaron works with a deliberately small roster of clients and handles architecture, strategy, and day-to-day execution personally, ensuring senior-level thinking at every stage rather than delegating to junior staff.
Danish Lead Co. builds fully managed outbound acquisition systems for B2B companies that need direct access to decision-makers. We combine buyer research, deliverability infrastructure, AI-assisted enrichment, outbound strategy, and multi-channel outreach to generate qualified commercial conversations at scale.
Across 110+ client engagements, the systems have generated 10,000+ sales conversations and over $30M in attributed revenue across SaaS, private equity, manufacturing, healthcare, energy, and other complex B2B industries.
TrueGTM is a GTM Engineering agency founded in 2025 by Shubh, who brings front-line B2B revenue experience to every engagement.
Before launching TrueGTM, Shubh started as a BDR and quickly scaled into a founding GTM role, building an outbound pipeline from scratch and helping take revenue past the $1M mark. He played a key role in growing Emergent - now valued at $1.5B and past $100M ARR- where he currently leads Enterprise-to-SMB TOFU strategy. Shubh has personally consulted multiple early-stage founders to build their GTM playbook.
TrueGTM sends 1 million+ emails per month for clients across Deeptech, AI, recruiting & staffing SaaS, and IT services. Across 18 clients, the agency has consistently delivered 20 to 30 qualified demos per month, peaking at 110 in a single month. TrueGTM has built a pipeline of over $20 Mn for its clients.
What makes TrueGTM different: most agencies build and own the infrastructure themselves. TrueGTM builds the system directly on the client's own stack, so their team can run and scale it independently, at a fraction of the cost of building an internal GTM engineering function. TrueGTM is a certified expert agency for Instantly, HeyReach, and Clay.
Beyond client work, Shubh runs the GTM Engineering (GTME) Cohort, training sales leaders, sales managers, founders, and senior AEs to build and own their outbound infrastructure. He shares his playbooks with a 12,000+ LinkedIn following and a newsletter read by 1,300+ subscribers.
Frontal is a B2B go-to-market agency that runs outbound, ads, content, and RevOps as one system, so qualified pipeline shows up for your sales team while they focus on selling.
Most B2B companies past product-market fit hit the same ceiling: referrals plateau, founder-led sales maxes out, SDRs spend their days building lists by hand, and the tools got bought but nobody has time to run them. Frontal is the extension of your go-to-market team: senior operators who plug in and run the work end to end, on one data spine, inside full visibility.
What we run for you:
GTM engineering: signal-driven outbound built and run end to end (in plain words: outbound, run for you)
Ads: account-based paid media aimed only at the accounts most likely to buy
Content: founder and company content engineered for pipeline, not vanity metrics
RevOps: CRM integration, enrichment infrastructure, routing, and reporting your CEO accepts
For teams that want to own the system, the Revenue Engine is our done-with-you build: your market mapped and tiered, live buying signals, workflows and playbooks built with your team, trained, documented, and handed over.
AI Bees is a B2B marketing and lead generation company with a listed address in San Francisco, California (50 California St, Suite 1500). The company states it started operations in 2018 to help businesses solve clients’ ongoing and potential problems using technology and data-driven methods. AI Bees describes itself as a global team and lists “100+ employees from 23 countries” and “2.5K+ generated leads per month” among its company stats.
AI Bees says it operates on a performance-based model, combining inbound and outbound strategies, and uses proprietary AI tools like AI Pigeons to craft hyper-personalized messages. On its Solutions page, AI Bees describes targeting top lookalike companies, pinpointing specific personas, and targeting persona pain points, and it presents an “AI bees Guarantee of 100% Performance-Based Marketing.