Solana Smart Contracts
I develop custom Solana smart contracts tailored to your project - any program your product needs. Built in Anchor and Rust with clear account models, tested instructions, and audit-ready structure.
Solana · Croatia, EU
Solana developer
Building on-chain programs, tokens, and dApps on Solana
I’m Željko Kovačević - a Solana developer based in Croatia. I build Rust/Anchor programs, SPL tokens, presale and affiliate systems, wallet integrations, and the backends that keep them production-ready. With 20+ years of software engineering and a Master of Information Technology, I focus on clear account models, solid testing, and shipping work that is ready for real users.
Focus
What I build on Solana
Solana Tokens (SPL)
I build SPL tokens on Solana - utility tokens, meme coins, fee-on-transfer (FoT), KYC-whitelisted issues, and tokens with custom extensions. Plus vesting, treasury, and distribution logic for your launch or product.
Token Launch
I run presales and meme coin launches end to end - contribution flows, liquidity setup, and everything else needed for a successful go-live. Ready for DEXes like Raydium, Meteora, Orca, and Pump.fun.
DeFi Platforms
I build DeFi on Solana - DEX integrations, AMMs, custom liquidity pools, and API connections to CEXes and similar trading venues. From pool logic to the systems that keep trading and liquidity running.
Full-stack dApps on Solana
I wire wallets, smart contracts, and backends into one product - Phantom, Solflare, WalletConnect, React frontends, and Node APIs that talk cleanly to your on-chain programs.
Jito bundles & JitoSOL
I integrate Jito for atomic batch transaction execution - Jito bundles that land multiple instructions together, plus JitoSOL and related liquid-staking flows when your product needs reliable, MEV-aware execution on Solana.
Featured projects
Production Solana systems
End-to-end products - on-chain programs, backends, and operator dashboards that shipped for real use.
EarlyEarn · PresaleShield
Crypto Affiliates System - on-chain split payments
Every on-chain purchase is split instantly across vendor, platform, affiliate, and team - no manual payouts. Anchor program, Node event indexing, and a Next.js dashboard with Phantom / Solflare / WalletConnect auth.
- Atomic split (vendor · platform · affiliate · team)
- PDA vaults and on-chain withdraw
- Presale + referral codes
- Full-stack: contract · API · wallet dApp
Rust · Anchor · Solana · Node.js · Next.js · React · Wallet adapters
Solana Token Ops
Token-2022 dashboard with on-chain KYC whitelist
Admin platform for issuing Solana Token-2022 assets with a Transfer Hook that enforces KYC at transfer time. Only whitelisted wallets can send or receive - non-listed addresses are rejected on-chain.
- Token-2022 mint + metadata
- KYC whitelist via Transfer Hook
- Approve / revoke wallet PDAs
- Mint · transfer · burn ops
Rust · Anchor · Token-2022 · Transfer Hook · Laravel · Solana
Launch work
Memecoin launches on Solana
Separate token launches - brand, landing, token, presale, and go-live. Projects that shipped on mainnet.
Stack
Solana stack I work with
- Rust
- Anchor
- SPL
- Token-2022
- Token Extensions
- Solana Web3.js
- React
- Node.js
- Phantom
- Solflare
- WalletConnect
FAQ
Solana developer - FAQ
- Where are you based, and who do you work with?
- I’m based in Croatia (EU) and work with teams worldwide - in English, with EU timezone overlap.
- What Solana work do you take on?
- Custom Anchor/Rust smart contracts, SPL and Token-2022 tokens (including Token Extensions), token launches and presales, DeFi (DEX/AMM/liquidity), full-stack dApps with wallet integrations, and Jito bundles / JitoSOL-related execution flows.
- Do you use Anchor and Rust?
- Yes. Most Solana programs I ship use Rust with Anchor, plus SPL / Token-2022 standards and modern wallet integrations.
- How do I hire you for a Solana project?
- Email contact@zeljko.dev, or start via Castor, Upwork, or Freelancer.com. Share goals, timeline, and constraints - next step is usually a short scoping call or a written proposal.
- What types of contracts do you offer?
- Fixed-price scopes for well-defined deliverables, or time-and-materials / hourly when the work is exploratory or evolving. Engagements can run through Castor d.o.o. (Croatia), Upwork, or Freelancer.com - with milestones and clear acceptance criteria when it helps.
- What payment methods do you accept?
- Payments in USD and EUR. Bank transfers via SEPA and SWIFT. Crypto is also fine when we agree it for the engagement.
- How does a typical Solana engagement start?
- We align on the product goal, account model, and risks first - then a proposal with scope, timeline, and commercial terms. Delivery is usually staged (design → program/tests → integration → launch support) so you can review progress along the way.
Contact
Need a Solana developer?
Tell me about your program, token, or dApp - timelines, constraints, and goals. I’ll reply with a practical next step.