140k+
requests per second in production, for a major browser wallet and a leading DEX aggregator
Senior engineers who own the architecture and ship to production.
A principal-led studio for technology companies, priced on outcomes rather than hours.
The studio
Felag is a boutique engineering studio whose principal-led pods design and ship production systems for funded fintech and technology companies, from backend and infrastructure at scale to payments and identity, with every engagement priced on the outcome.
What we build
Four things we build.
01
Backend and infrastructure at scale
The services, queues and data stores that hold at production load, the cloud under them written as code, and the front ends on top, measured on load and interaction time.
02
Payments rails
Card programmes, account ledgers, settlement and the integrations with issuers, processors and banks, with the audit trail a regulated business is asked to produce.
03
Identity and SSO
Enterprise single sign-on, account models and the permission layer between them, and identity for the software agents that act on a person's behalf.
04
Distributed ledgers, where they fit
Where a product needs a ledger that several parties have to trust, we design and ship it; where it does not, the sprint says so.
01 / 04
StackGo, Rust, Node.js/TypeScript, Python, Solidity; React/Next.js, Vue/Nuxt, React Native/Expo, Flutter; AWS, GCP, Kubernetes, Terraform; EVM (Ethereum, L2s, Polygon CDK), Substrate/Polkadot, Solana, Cosmos, Canton/Daml, Stellar, Bitcoin/Lightning, TON; Postgres, Redis, ScyllaDB/Cassandra, ClickHouse, Kafka, NATS, RabbitMQ, gRPC, GraphQL, REST, websockets, The Graph and custom indexers.
Proof
What we have shipped.
One team, three names: Uddug from 2018, the Platform department of Gateway.fm from 2024 to 2026, Felag from 2026.
$100M+
raised, collectively, by NFT launches by our team
9M+
users on Humanity Protocol, whose application layer we built
Nine cases, each in the words the record allows, with the public record linked where one exists.
01 / 09
Launched August 2024
Wirex Pay
We delivered the Wirex Pay platform end to end: an L2 chain that launched in August 2024, and the application layer, indexer, oracles and account abstraction behind its non-custodial debit cards, built for MiCA alignment.
Gateway.fm, 2024
02 / 09
2019 to 2020, then a Uddug client
Snark.art
Andrew was technical lead and CTO of Snark.art, an NFT launch platform for established artists, from 2019 to 2020; Snark.art later became a Uddug client.
Andrew, then Uddug
03 / 09
Frank Stella, Geometries
Arsnl.art
Uddug built the NFT platform behind Arsnl.art, including Frank Stella's 'Geometries'.
Uddug, from 2022
04 / 09
XIP-9, approved December 2023
Infinex and Synthetix
We built the event infrastructure and backend for Infinex, the Synthetix front-end, under governance proposal XIP-9.
Uddug with Gateway.fm, 2023 to 2024
05 / 09
9M+ users
Humanity Protocol
We built the application layer for Humanity Protocol, an identity network with 9M+ users.
Gateway.fm, 2024 to 2025
06 / 09
~25 people across two departments
The Gateway.fm Platform department
In June 2024 Gateway.fm acquired Uddug and the team became its Platform department, ~25 people across two departments, whose work included Wirex Pay, Humanity Protocol, the shared prover, the oracles and Gateway Yield.
Gateway.fm, 2024 to 2026
07 / 09
GPU and CPU autoscaling on spot capacity
A shared prover for EY Nightfall, Polygon, Miden and Iden3
We built a shared prover used across several ZK protocols and L2 ecosystems, including EY Nightfall, Polygon zkEVM, Miden and Iden3, with GPU and CPU autoscaling on AWS spot capacity.
Gateway.fm, 2024 to 2025
08 / 09
$140M+ FDV at launch, January 2026
DeepNode
Andrew served as fractional CTO to DeepNode for ten months, designing its decentralised AI infrastructure, and the Gateway.fm Platform department built the platform, through its January 2026 token launch and exchange listing at $140M+ FDV at launch, with the network measured at about 5,000 requests per second.
Andrew with the Gateway.fm Platform department, 2025 to 2026
09 / 09
2017 to 2018, told as it was
ICEX
ICEX was the founders' own exchange project of 2017 to 2018, roughly 70 percent built when the investor withdrew in the 2018 crypto winter, and it never launched. The push oracle the team later shipped was first built there.
The founders, before Uddug
Names
The names on the record.
Clients and products we built for, and the protocols our systems served. Open a name for the line it is allowed to carry.
Gateway.fm, 2024
We delivered the Wirex Pay platform end to end: an L2 chain that launched in August 2024, and the application layer, indexer, oracles and account abstraction behind its non-custodial debit cards, built for MiCA alignment.
Uddug with Gateway.fm, 2023 to 2024
We built the event infrastructure and backend for Infinex, the Synthetix front-end, under governance proposal XIP-9.
Gateway.fm, 2024 to 2025
We built the application layer for Humanity Protocol, an identity network with 9M+ users.
Andrew with the Gateway.fm Platform department, 2025 to 2026
Andrew served as fractional CTO to DeepNode for ten months, designing its decentralised AI infrastructure, and the Gateway.fm Platform department built the platform, through its January 2026 token launch and exchange listing at $140M+ FDV at launch, with the network measured at about 5,000 requests per second.
Gateway.fm, 2024 to 2026
In June 2024 Gateway.fm acquired Uddug and the team became its Platform department, ~25 people across two departments, whose work included Wirex Pay, Humanity Protocol, the shared prover, the oracles and Gateway Yield.
Gateway.fm, 2024 to 2025
We built a shared prover used across several ZK protocols and L2 ecosystems, including EY Nightfall, Polygon zkEVM, Miden and Iden3, with GPU and CPU autoscaling on AWS spot capacity.
Gateway.fm, 2023 to 2025
LUKSO received the push oracle we designed, delivering multi-asset prices every 500 ms.
Gateway.fm, 2023 to 2025
Lumia received the push oracle we designed, delivering multi-asset prices every 500 ms.
Gateway.fm, 2023 to 2025
For ApeChain we designed a pull-based price feed at about 1,000 requests per second and a native verifiable-randomness oracle.
Gateway.fm, 2023 to 2025
We led the Presto tokenised-finance product to revenue and built its stablecoin, RWA, DEX and payments blueprints.
Gateway.fm
Gnosis ran on the RPC proxy we designed at Gateway.fm, and is one of the protocols Gateway Yield served.
Gateway.fm, 2021 to 2022
The Ethereum Foundation ran on the RPC proxy we designed at Gateway.fm.
Uddug, 2020 to 2021
Uddug won and delivered Web3 Foundation and Protocol Labs grants and RFPs.
Uddug, 2020 to 2021
Uddug won and delivered Web3 Foundation and Protocol Labs grants and RFPs.
Uddug, 2020 to 2021
Uddug won and delivered Parity Substrate grants and RFPs alongside the Web3 Foundation ones.
Uddug, 2021
Uddug launched OG:Crystals, which raised $10M+ at launch.
Uddug, 2021
Uddug launched Marscatsvoyage, $2M+ at launch.
Uddug, from 2022
Uddug built the NFT platform behind Arsnl.art, including Frank Stella's 'Geometries'.
Uddug, 2023
Uddug built the smart contracts for Metazoku in 2023.
Andrew, then Uddug
Andrew was technical lead and CTO of Snark.art, an NFT launch platform for established artists, from 2019 to 2020; Snark.art later became a Uddug client.
Uddug with Gateway.fm, 2023 to 2024
Infinex is the Synthetix front-end; we built its event infrastructure and backend under governance proposal XIP-9.
Gateway.fm, 2025 to 2026
One of the protocols served by Gateway Yield, the staking infrastructure we ran.
Gateway.fm, 2025 to 2026
One of the protocols served by Gateway Yield, the staking infrastructure we ran.
Gateway.fm, 2025 to 2026
One of the protocols served by Gateway Yield, the staking infrastructure we ran.
Gateway.fm, 2024 to 2025
One of the ZK protocols served by the shared prover we built, with GPU and CPU autoscaling on AWS spot capacity.
Gateway.fm, 2024 to 2025
One of the ZK protocols served by the shared prover we built, with GPU and CPU autoscaling on AWS spot capacity.
Gateway.fm, 2024 to 2025
One of the ZK protocols served by the shared prover we built, with GPU and CPU autoscaling on AWS spot capacity.
The record
The record, in three eras.
Uddug
2018 to 2024
Andrew Skurlatov and Mikhail Manko founded Uddug in 2018; the two have worked together since 2015.
2020 to 2021
Web3 Foundation and Protocol Labs
Uddug won and delivered Web3 Foundation and Protocol Labs grants and RFPs.
2021
OG:Crystals
Uddug launched OG:Crystals, which raised $10M+ at launch.
2021
Marscatsvoyage
Uddug launched Marscatsvoyage, $2M+ at launch.
From 2022
Arsnl.art
Uddug built the NFT platform behind Arsnl.art, including Frank Stella's 'Geometries'.
2023
Metazoku
Uddug built the smart contracts for Metazoku in 2023.
2023 to 2024
Infinex, with Gateway.fm
We built the event infrastructure and backend for Infinex, the Synthetix front-end, under governance proposal XIP-9.
Gateway.fm
2021 to 2026
Andrew joined Gateway.fm in 2021 as one of its first engineers. In June 2024 Gateway.fm acquired Uddug and the team became its Platform department, ~25 people across two departments.
2021 to 2022
The RPC proxy
We designed the RPC proxy that served 140k+ requests per second in production for a major browser wallet and a leading DEX aggregator.
2023 to 2025
Presto
We led the Presto tokenised-finance product to revenue and built its stablecoin, RWA, DEX and payments blueprints.
2023 to 2025
The indexing platform
We built an EVM event-indexing code-generation platform that became the standard across most of the company's projects.
2023 to 2025
Oracles
We designed a push oracle that delivered multi-asset prices every 500 ms for Wirex Pay, Infinex, LUKSO and Lumia, and, for ApeChain, a pull-based feed at about 1,000 requests per second and a native verifiable-randomness oracle.
2024
Wirex Pay
We delivered the Wirex Pay platform end to end: an L2 chain that launched in August 2024, and the application layer, indexer, oracles and account abstraction behind its non-custodial debit cards, built for MiCA alignment.
2024 to 2025
Humanity Protocol
We built the application layer for Humanity Protocol, an identity network with 9M+ users.
2024 to 2025
The shared prover
We built a shared prover used across several ZK protocols and L2 ecosystems, including EY Nightfall, Polygon zkEVM, Miden and Iden3, with GPU and CPU autoscaling on AWS spot capacity.
2025
Wallets with enterprise single sign-on
We designed and built account-abstraction wallets with enterprise single sign-on for a global technology company.
2025
Identity for AI agents, a pilot
We built an identity system for AI agents on a major cloud platform for the same global technology company, as a pilot.
2025 to 2026
DeepNode
Andrew served as fractional CTO to DeepNode for ten months, designing its decentralised AI infrastructure, and the Gateway.fm Platform department built the platform, through its January 2026 token launch and exchange listing at $140M+ FDV at launch, with the network measured at about 5,000 requests per second.
2025 to 2026
Gateway Yield
We ran Gateway Yield, the infrastructure behind $1B+ locked in staking, serving Lido, Gnosis, Stellar and Canton.
Felag
From July 2026
Felag was founded in July 2026 as the restart of Uddug.
What it costs
We do not bill hours.
Engagements and prices, in US dollars excluding VAT.
01 / 05
Free technical workshop
A time-boxed session with a founder that frames the problem, constraints and options and ends with a sprint scope or a clear no. It produces a decision, not a spec.
Free
What you get
- The problem, the constraints and the options, framed
- A sprint scope, or a clear no
Terms
- Free
- Time-boxed
- No spec, no design, no estimate
Who delivers
A founder
02 / 05
Architecture Sprint
One to two weeks with a named principal: spec, architecture decisions, risk register, costed build options and a build decision. Paid in advance, credited against a pod or fixed-price build signed within 30 days.
$7.5klaunch price, list $15k
What you get
- Spec and architecture decisions
- Risk register
- Costed build options
- A build decision
Terms
- One to two weeks
- Paid in advance
- Credited against a pod or fixed-price build signed within 30 days
Who delivers
A named principal
03 / 05
Fractional CTO
A named principal, never a contractor, with explicit days, decisions and ownership. Monthly in advance, three-month initial term.
From $4k a monthone day a week; two days and ad hoc days priced per engagement
What you get
- Explicit days
- The architecture, the hiring bar and the technical decisions owned
- Representation with the board and investors where needed
Terms
- Monthly in advance
- Three-month initial term
Who delivers
Andrew, Pavel or Andrey, never a contractor
04 / 05
Pods
From one senior engineer with principal oversight to a named principal leading a team of two to three, on defined outcomes. Monthly in advance, cancel with two weeks' notice, the principal named in the SOW.
$10k to $60k a monthby size
What you get
- Defined outcomes, not hours
- From one senior with principal oversight to a principal-led team of two to three
- Fixed-price builds quoted from a completed sprint
Terms
- Monthly in advance
- Cancel with two weeks' notice
- Principal named in the SOW; substitution needs the client's consent
Who delivers
A named principal, with senior and specialist engineers as the scope needs
05 / 05
Technical due diligence
A fixed-scope review for investors and acquirers. Fixed price, half paid on start.
Quote per scopefixed price, half paid on start
What you get
- A fixed-scope review of the system and the team
- Findings an investor or acquirer can act on
Terms
- Fixed price
- Half paid on start
Who delivers
A named principal
How an engagement runs
How an engagement runs.
Four steps, each with a clear output.
01Workshop
The problem, framed.
Free, with a founder. Ends with a sprint scope or a clear no.
02Architecture Sprint
Architecture and a detailed technical proposal.
One to two weeks with a named principal.
03Decision
A fixed scope, agreed together.
Set by the client and our engineers on the sprint output.
04Pod
A team built for the task.
Formed around the scope and scaled with it.
The principal who leads the work is named in the SOW and changes only with the client's consent.
Who we work with
Six situations we see most often.
01
A post-raise CTO with a hard integration and no senior hire in time
The Series A or B roadmap has an integration nobody on the team has shipped before, and the senior hire will not land in time. We take the integration as a defined outcome and hand it back documented.
02
A funded technology company with a performance, scale or reliability problem
The product works until it is busy. We measure the problem first, then fix the cause, and we say so when the answer is a smaller change than the team expected.
03
A regulated payments or asset issuer rebuilding for a new regime
MiCA, DORA, the UK regime, GENIUS, VARA, HKMA or MAS has changed what the system must record and prove, and the team needs engineers who have built for one of these regimes before.
04
A licensed fintech replacing a failed offshore vendor
The codebase arrived without the people who wrote it. We audit what is there, keep what works, and take ownership of the rest under a named principal.
05
A founder with a co-founder gap
The company needs a CTO for one or two days a week to own the architecture, the hiring bar and the technical decisions until a full-time hire makes sense.
06
A product agency without a senior backend bench
The agency has the design and the client, and needs a principal behind the backend for the length of the engagement without building that bench itself.
What we turn down
Hourly billing without a spend cap, a dedicated eight-person team as a product, public-sector tenders scored on headcount, and any work that would turn us back into a fifteen-person shop.
Who we are
The people who lead the work.
Andrew Skurlatov
Co-founder and CTO
Based in the Netherlands
Andrew Skurlatov is co-founder and CTO of Felag. He has spent 15 years in software, 10 of them in blockchain, as an engineering leader and serial founder. He co-founded Uddug in 2018 as its CTO and led it to its acquisition by Gateway.fm in 2024. There he became VP of DLT and later VP of Platform and Yield, running ~25 people across two departments whose work included the Wirex Pay platform, identity projects for a global technology company and the infrastructure behind $1B+ locked in staking.
Mikhail Manko
Co-founder and CEO
Based in Cyprus
Mikhail Manko is co-founder and CEO of Felag. He has spent 13 years in IT running teams, products and operations. He co-founded Uddug with Andrew Skurlatov in 2018 and led it through its acquisition by Gateway.fm in 2024, where he was Head of Platform for the tokenised-finance product. At Felag he runs partnerships and deals, from the first call to the signed contract.
Pavel Dodonov
Principal Engineer, Infrastructure and ZK, partner
Pavel Dodonov is Principal Engineer for infrastructure and ZK at Felag and a partner. In nearly four years at Gateway.fm he rose from Go backend engineer to Backend Lead and led the shared prover architecture for L2 ecosystems, GPU and CPU autoscaling for the prover fleets, and an EVM event-indexing platform that most of the company's projects reused. Before that he spent a decade in scientific R&D, with 20+ published papers.
Andrey Solovov
Principal Engineer, Web3 Systems, partner
Andrey Solovov is Principal Engineer for Web3 systems at Felag and a partner. For more than two years he was Blockchain Dev Lead at Gateway.fm, shipping production systems for DeFi, oracle, L2 and identity clients, among them a push oracle that delivered multi-asset prices every 500 ms and a pull-based feed at about 1,000 requests per second. Before Gateway he built smart contracts and payments architecture at Uddug.
The founders have worked together since 2015. Felag is the 2026 restart of Uddug, acquired in 2024. A named principal leads every engagement; contractors join on demand and are never sold as principals.
Questions we are asked
The ones that come up on nearly every first call.
Do you bill by the hour?
No. Sprints and technical due diligence are fixed price, pods and fractional CTO work are monthly retainers, and the workshop is free. If a buyer insists on time and materials, we take it only with a monthly spend cap and weekly scope decisions, at the pod price.
Who actually works on our system?
A named principal, one of the people above, leads every engagement and is written into the SOW. Contractors join for QA, DevOps and additional development when the scope needs them, and they are never presented as principals.
How do we start?
With a free technical workshop with a founder. If there is a fit, it ends with the scope of a paid Architecture Sprint; if there is not, it ends with a clear no.
Where are you based and who do we contract with?
The contract is with Felag. The principals work from the Netherlands and Cyprus.
Do you work with regulated companies?
Yes. We built the Wirex Pay platform and the application layer behind its debit card programme for MiCA alignment. We have not taken a system through an audit under MiCA, and we say so before a sprint starts.
What do you turn down?
Hourly billing without a spend cap, a dedicated eight-person team sold as a product, public-sector tenders scored on headcount, and work that would grow us back into a fifteen-person shop.
Do you use AI in delivery?
Yes, on our own AI-assisted development framework. It runs under the named principal's review, and the outcome in the SOW is what we are accountable for, whatever tooling produced it.
Next step
Let’s talk.
Start with a free technical workshop with a founder. Write to info@felag.net.